Environmental_Document_-_Permit_Boise_River_-_Bridge_Replacement.pdf

322 E Front Street, Suite 648, Boise ID 83702 • PO Box 83720, Boise ID 83720-0098 Phone: 208-287-4800 • Fax: 208-287-6700 • Email: idwrinfo@idwr.idaho.gov • Website: idwr.idaho.gov

Governor Brad Little Director Mathew Weaver

April 15, 2026

Logan Hansen Ada County Highway District 5800 N. Meeker Ave.

Boise, ID 83713

RE: Joint Application for Permit No. S63-21267 Boise River – Bridge Replacement

Dear Mr. Hansen, The Idaho Department of Water Resources (IDWR) has reviewed your above referenced application for a permit to alter the Boise River. IDWR has prepared a decision as provided for in Section 42-3805, Idaho Code. The conditions set forth in this permit are intended to prevent degradation of water quality, protect fish and wildlife habitat, and protect the long-term stability of the stream channel. If you cannot meet the conditions set forth in the permit, please contact this office for further consideration.

Your project has been determined to meet the Stream Channel Alteration Rules, IDAPA

37.03.07 Minimum Standards (Rule 55). You may consider this letter a permit to construct your project according to your application, received January 23, 2026, including diagrams. The project location is within Township 03 North, Range 03 East, Section 29, Boise Meridian, Ada County, Idaho.

Project activities include replacing a bridge over the Boise River. After placing dewatering measures, existing riprap will be removed from the river. Bridge piers will also be removed from the river by cutting at least 18-inches below the riverbed surface, after which native stream substrate will be placed into the pier voids to match the existing grade. The replacement bridge will be constructed with two concrete piers and riprap protection within the Ordinary High Water Mark (OHWM). The project will result in the permanent discharge of 75-cubic yards of rock and 950-cubic yards of concrete below the OWHM. The bridge has been designed to pass 1% flows with at least 1-foot of freeboard.

An existing bridge over the Ridenbaugh Canal is proposed to be replaced as part of this project. It has been determined that an IDWR Stream Channel Alteration permit will not be required for the replacement of the canal bridge as provided for within 42-3802(d), Idaho Code.

Failure to adhere to the conditions as set forth herein can result in legal action as provided for in Section 42-3809, Idaho Code. This project is subject to the following Minimum Standards, Special and General Conditions.

MINIMUM STANDARDS:

These standards are established in the Administrative Rules of the Idaho Water Resources

Board; Stream Channel Alteration Rules, IDAPA 37.03.07 dated March 18, 2022, and are enclosed with this permit.

Rule 56 - Construction Procedures Rule 59 – Culverts and Bridges

SPECIAL CONDITIONS:

1. All construction shall be completed in accordance with the descriptions and methods on the attached application and diagrams unless otherwise specified. This office must approve any changes prior to construction.

2. All construction activities shall take place during low flow to minimize turbidity, protect water quality, and comply with Idaho water quality standards. Equipment shall not enter the live stream channel.

3. No uncured concrete shall come into contact with surface water.

4. Katie Gibble, IDWR Stream Protection Program 208-287-4823, shall be contacted no more than fourteen (14) business days after completion of the project to schedule a site inspection.

5. A final dewatering plan, including diagrams, shall be submitted to IDWR for approval at least four (4) weeks prior to any construction below the Ordinary High Water Mark. The dewatering plan shall specify a maximum flow rate (cfs) of the Boise River at which dewatering measures will be in place.

6. Care shall be taken to select locations for ingress and egress to the project site that will minimize bank and riparian vegetation damage. Damaged areas shall be replanted with native vegetation.

7. Silt fencing or other erosion/sediment control measures shall be installed between any area of earth disturbance and the water. Erosion and sediment control measures shall be installed according to the manufacturer’s specifications, during construction, and must be maintained until construction is completed and the disturbed ground is revegetated and stable.

8. All temporary structures, excess excavated material, and vegetative or construction debris shall be disposed of out of the stream channel where it cannot reenter the channel. All construction debris shall be removed from the site and disposed of properly.

9. All fuel, oil, and other hazardous materials shall be stored and equipment refueled away from the stream channel to ensure that a spill will not enter the waterway. Equipment must be free of fuel and lubricant leaks. The operator shall have spill control materials available at all times during this project. In the event of a release greater than 25 gallons of fuel or oil to the ground or to surface waters, the Idaho State Communications Center shall be contacted at 1-800-632-8000.

10. Permittee is responsible for all work done by any contractor or sub-contractor and shall ensure any contractor who performs the work is informed of and follows all the terms and conditions of this authorization.

11. This permit shall expire December 31, 2028.

GENERAL CONDITIONS:

1. This permit does not constitute any of the following:

a. An easement or right-of-way to trespass or work upon property belonging to others.

b. Other approval that may be required by Local, State or Federal Government, unless specifically stated in the special conditions above.

c. Responsibility of IDWR for damage to any properties due to work done.

d. Compliance with the Federal Flood Insurance Program, FEMA regulations, or approval of the local Planning and Zoning authority.

2. In accordance with Sections 55-2201 - 55-2210, Idaho Code, the applicant and/or contractors must contact Digline statewide phone number 1-800-342-1585 (Boise area 208- 342-1585) not less than three working days prior to the start of any excavation for this project.

3. The permit holder or operator must have a copy of this permit at the alteration site, available for inspection at all times.

4. IDWR may cancel this permit at any time that it determines such action is necessary to minimize adverse impact on the stream channel.

Failure to adhere to conditions as set forth herein can result in legal action as provided for in Section 42-3809, Idaho Code.

If you object to the decision issuing this permit with the above conditions, you have 15 days in which to notify this office in writing that you request a formal hearing on the matter. If an objection has not been received within 15 days, the decision will be final under the provisions of IDAPA 37.03.07 (Rule 70).

Please contact Katie Gibble at 208-287-4823 or katie.gibble@idwr.idaho.gov if you have any questions regarding this matter.

Sincerely, Katie Gibble

Stream Channel Protection Idaho Department of Water Resources mailto:katie.gibble@idwr.idaho.gov cc: Katie Krajicek, HDR Engineering, Omaha Zach Kirk, Ada County, Boise Jeff Lowe and Josh Wilson, City of Boise, Boise Greg Curtis, Nampa-Meridian Irrigation District, Nampa Meghan Cline and Lance Holloway, Idaho Department of Environmental Quality, Boise

Brandon Flack, Idaho Department of Fish and Game, Nampa Dean Johnson, Idaho Department of Lands, Boise U.S. Army Corps of Engineers, Boise

Aaron Golart, Idaho Department of Water Resources, Boise

IDAHO ADMINISTRATIVE CODE IDAPA 37.03.07

Department of Water Resources Stream Channel Alteration Rules

Section 056 Page 1

056. CONSTRUCTION PROCEDURES (RULE 56).

01. Conformance to Procedures. Construction shall be done in accordance with the following procedures unless specific approval of other procedures has been given by the Director. When an applicant desires to proceed in a manner different from the following, such procedures should be described on the application. (3-18-22)

02. Operation of Construction Equipment. No construction equipment shall be operated below the existing water surface without specific approval from the Director except as follows: Fording the stream at one (1) location only will be permitted unless otherwise specified; however, vehicles and equipment will not be permitted to push or pull material along the streambed below the existing water level. Work below the water which is essential for preparation of culvert bedding or approved footing installations shall be permitted to the extent that it does not create unnecessary turbidity or stream channel disturbance. Frequent fording will not be permitted in areas where extensive turbidity will be created. (3-18-22)

03. Temporary Structures. Any temporary crossings, bridge supports, cofferdams, or other structures that will be needed during the period of construction shall be designed to handle high flows that could be anticipated during the construction period. All structures shall be completely removed from the stream channel at the conclusion of construction and the area shall be restored to a natural appearance. (3-18-22)

04. Minimizing Disturbance of Area. Care shall be taken to cause only the minimum necessary disturbance to the natural appearance of the area. Streambank vegetation shall be protected except where its removal is absolutely necessary for completion of the work adjacent to the stream channel. (3-18-22)

05. Disposal of Removed Materials. Any vegetation, debris, or other material removed during construction shall be disposed of at some location out of the stream channel where it cannot reenter the channel during high stream flows. (3-18-22)

06. New Cut of Fill Slopes. All new cut or fill slopes that will not be protected with some form of riprap shall be seeded with grass and planted with native vegetation to prevent erosion. (3-18-22)

07. Fill Material. All fill material shall be placed and compacted in horizontal lifts. Areas to be filled shall be cleared of all vegetation, debris and other materials that would be objectionable in the fill. (3-18-22)

08. Limitations on Construction Period. The Director may limit the period of construction as needed (3-18-22)to minimize conflicts with fish migration and spawning, recreation use, and other uses.

Section 059 Page 1

059. CULVERTS AND BRIDGES (RULE 59).

01. Culverts and Bridges. Culverts and bridges shall be capable of carrying streamflows and shall not significantly alter conditions upstream or downstream by causing flooding, turbidity, or other problems. The appearance of such installations shall not detract from the natural surroundings of the area. (3-18-22)

02. Location of Culverts and Bridges. Culverts and bridges should be located so that a direct line of approach exists at both the entrance and exit. Abrupt bends at the entrance or exit shall not exist unless suitable erosion protection is provided. (3-18-22)

03. Ideal Gradient. The ideal gradient (bottom slope) is one which is steep enough to prevent silting but flat enough to prevent scouring due to high velocity flows. It is often advisable to make the gradient of a culvert coincide with the average streambed gradient. (3-18-22)

a. Where a culvert is installed on a slope steeper than twenty percent (20%), provisions to anchor the culvert in position will be required. Such provisions shall be included in the application and may involve the use of collars, headwall structures, etc. Smooth concrete pipe having no protruding bell joints or other irregularities shall have such anchoring provisions if the gradient exceeds ten percent (10%). (3-18-22)

04. Size of Culvert or Bridge Opening. The size of the culvert or bridge opening shall be such that it is capable of passing design flows without overtopping the streambank or causing flooding or other damage.

(3-18-22)

a. Design flows shall be based upon the following minimum criteria:

(3-18-22)

Drainage Area Design Flow Frequency

Less than 50 sq. mi. 25 Years

Over 50 sq. mi. or more 50 years or greatest flow of record, whichever is more

b. For culverts and bridges located on U.S. Forest Service or other federal lands, the sizing shoul d comply with the Forest Practices Act as adopted by the federal agencies or the Department of Lands. (3-18-22)

c. For culverts or bridges located in a community qualifying for the national flood issuance program, the minimum size culvert shall accommodate the one hundred (100) year design flow frequency. (3-18-22)

d. If the culvert or bridge design is impractical for the site, the crossing may be designed wit h additional flow capacity outside the actual crossing structure, provided there is no increase in the Base Floo d Elevation.

(NOTE: When flow data on a particular stream is unavailable, it is almost always safe to maintain the existin g gradient and cross-section area present in the existing stream channel. Comparing the proposed crossing size with others upstream or downstream is also a valuable means of obtaining information regarding the size needed for a proposed crossing.) (3-18-22)

e. Minimum clearance shall be at least one (1) foot at all bridges. This may need to be increased substantially in the areas where ice passage or debris may be a problem. Minimum culvert sizes required for stream crossings: (3-18-22)

i. Eighteen (18) inch diameter for culverts up to seventy (70) feet long; (3-18-22)

ii. Twenty-four (24) inch diameter for all culverts over seventy (70) feet long. (3-18-22)

f. In streams where fish passage is of concern as determined by the director, an applicant shall comply with the following provisions and/or other approved criteria to ensure that passage will not be prevented by a proposed crossing. (3-18-22)

Section 059 Page 2

g. Minimum water depth shall be approximately eight (8) inches for salmon and steelhead and at least three (3) inches in all other cases. (3-18-22)

h. Maximum flow velocities for streams shall not exceed those shown in Figure 17 in APPENDIX H, located at the end of this chapter, for more than a forty-eight (48) hour period. The curve used will depend on the type of fish to be passed. (3-18-22)

i. Where it is not feasible to adjust the size or slope to obtain permissible velocities, the following precautions may be utilized to achieve the desired situation. (3-18-22)

j. Baffles downstream or inside the culvert may be utilized to increase depth and reduce velocity.

Design criteria may be obtained from the Idaho Fish and Game Department. (3-18-22)

k. Where multiple openings for flow are provided, baffles or other measures used in one (1) opening only shall be adequate provided that the opening is designed to carry the main flow during low-flow periods.

(3-18-22)

05. Construction of Crossings. When crossings are constructed in erodible material, upstream and downstream ends shall be protected from erosive damage through the use of such methods as dumped rock riprap, headwall structures, etc., and such protection shall extend below the erodible streambed and into the banks at least two (2) feet unless some other provisions are made to prevent undermining. (3-18-22)

a. Where fish passage must be provided, upstream drops at the entrance to a culvert will not be permitted and a maximum drop of one (1) foot will be permitted at the downstream end if an adequate jumping pool is maintained below the drop. (3-18-22)

b. Downstream control structures such as are shown in Figure 18 in APPENDIX I, located at the end of this chapter, can be used to reduce downstream erosion and improve fish passage. They may be constructed with gabions, pilings and rock drop structures. (3-18-22)

06. Multiple Openings. Where a multiple opening will consist of two (2) or more separate culvert structures, they shall be spaced far enough apart to allow proper compaction of the fill between the individua l structures. The minimum spacing in all situations shall be one (1) foot. In areas where fish passage must be provided, only one (1) opening shall be constructed to carry all low flows. Low flow baffles may be required to facilitate fish passage. (3-18-22)

07. Areas to be Filled. All areas to be filled shall be cleared of vegetation, topsoil, and other unsuitabl e material prior to placing fill. Material cleared from the site shall be disposed of above the high water line of th e stream. Fill material shall be reasonably well-graded and compacted and shall not contain large quantities of silt, sand, organic matter, or debris. In locations where silty or sandy material must be utilized for fill material, it will b e necessary to construct impervious sections both upstream and downstream to prevent the erodible sand or silt fr om being carried away (see Figure 19, APPENDIX J, located at the end of this chapter), Sideslopes for fills shall no t exceed one and one half to one (1.5:1). Minimum cover over all culvert pipes and arches shall be one (1) foot.

(3-18-22)

08. Installation of Pipe and Arch Culvert. All pipe and arch culverts shall be installed in accordance with manufacturer’s recommendations. (3-18-22)

a. The culvert shall be designed so that headwaters will not rise above the top of the culvert entrance (3-18-22)unless a headworks is provided.

RECEIVED

JOINT APPLICATION FOR PERMITS JAN23.2O26

*?i:iT$'J,'.?:"

U.S. ARMY CORPS OF ENGINEERS . IDAHO DEPARTMENT OF WATER RESOURCES - IDAHO DEPARTMENT OF LANDS

Authorities: The Department of Army Corps of Engineers (Corps), ldaho Department of Water Resources (IDWR), and ldaho Department of Lands (lDL) established a joint process for activities impacting jurisdictional waterways that require review and/or approval of both the Corps and State of ldaho. Department of Army permits are required by

Section 10 of the Rivers & Harbors Act of 1899 for any structure(s) or work in or affecling navigable waters of the United States and by Section 404 of the Clean Water Act for

Act(Title42,Chapter38, ldahoCodeandLakeProtectionAct(Section53,Chapterl3etseq., ldahoCode). lnadditiontheinformationwill beusedtodeterminecompliance with Section 401 of the Clean Water Act by the appropriate State, Tribal or Federal entity.

the requested information may delay processing and issuance of the appropriate permit or authorization. Applicant will need to send a completed application, along with one (1) set of legible, black and white (8%"x11"), reproducible drawings that illustrate the location and character of the proposed project / activities to both the

Corps and the State of ldaho.

See lnsfrucfr'on Guide for assistance with Application. Accurate submission of requested information can prevent delays in reviewing and permitting your application.

Drawings including vicinity maps, plan-view and section-view drawings must !e submitted on 8-1/2 x 1 1 papers._- - Do nbt start work until you have recelVed all required permits from both the Corps and the State of ldaho

Date Received:

I lncomplete Application Returned

Date Returned:USACE

NWW-

Date Received:

ot lzzlzu [p Fee Received

DATE: OtlZglZv Receipt No.:

cJ Z460-1 ldaho Department of Water Resources

No. lpb- zrzvl Receipt No.:

2. CONTACT INFORMATION. AGENT:

Fee Received

DATE:

ldaho Department of Lands

No.

1. CONTACT INFORMATION - APPLICANT Required:

Date Received:

Name:

Logan Hansen

Name:

Katie Krajicek

Company:

HDR Engineering, Inc.

Company:

Ada County Highway District

Mailing Address:

l9l7 S. 67th Street Mailing Address:

5800 N. Meeker Ave.

State:

NE

Zip Code:

68106 State

ID

Zip Code:

83713

City:

Omaha City;

Boise

PhOne N Umbef (,ir ctude ffia code)'.

402-548-5005

E-mail:

katie.kaj icek@hdrinc. com Phone Number r,in crude ffia code)"

986-2t8-9207

E-mail:

lhansen@achdidaho.org

4. PROJECT STREET ADDRESS: o^u.,, Rnqrt/Frather DarL r1ri'a rnrercenrinn3. PROJECTNAMEoTTITLE: LILB 12810

8. NEAREST WATERWAYMATERBODY:

Boise River

5. PROJECTCOUNTY:

Ada County

6. PROJECT CITY

Boise

7, PROJECTZIPCODE:

83706

1.Id. TOWNSHIP:

3 North

11e. MNGE:

3 East

10. LATITUDE:

LONGITUDE:

41 5654n'l

-ll6 ti?50R

11a. 114'.

NW

11b. 1t4:

SW

'llc. SECTION:

9. TAX PARCEL ID#:

Unknown

12b. ESTIMATED END DATE:

November 2027

13a. lS PROJECT LOCATED WITHIN ESTABLISHED TRIBAL RESERVATI0N B0UNDARIES?

E ruo I ves rribe:

12a. ESTIMATED START DATE:

October2026

13c. rS PROJECT LOCATED ON/NEAR HTSTORTCAL S|TE? I UO I vesI3b.ISPRoJECTLoCATEDINLISTEDESAAREA? n ruo fi ves

14, DIRECTIONS T0 PROJECT SITE: lnclude vicinity map with legible crossroads, street numbers, names, landmarks.

From the intersection of Interstate 84 and Broadway Ave. (State Highway 20126),travel north on Broadway Ave. for approximately 0.3 mile. Take the

Federal Way exit and travel southeast on Federal Way for approximately 1.5 miles. Tum left onto Amity Rd. and trave I for approximately 2.2 miles until you arrive at the Eckert Rd. Bridge over the Boise River (Amity Rd. tums into Boise Ave., then turns into S. Eckert Rd.).

15. PURPOSE and NEED: I Commercial ! tndustrial fi RuUic I erivate I Ottrer

Describe the reason or purpose of your project; include a brief description of the overall project. Continue to Block 16 to detail each work activity and overall project.

The purpose ofthe Eckert Road Bridges Replacement project is to provide safe crossings over the Boise River and Ridenbaugh Canal that are adequate for vehicles, bicycles, and pedestrians. Several bridge deficiencies have been recorded. The existing bridges are beyond their intended design life, and the

Boise River Bridge was restricted with posted load limitations for a short time in the winter of 2025 before interim improvements were constructed.

FOR AGENCY USE ONLY

NWW Form 1145-1/IDWR 3804-8 Page 1 of4 sources, disposal locations etc.:

Project activities include reconstructing and widening Eckert Road within the project area and reconstruction ofthe Boise River Bridge and the Ridenbaugh Canal Bridge. See Attachment A for details.

'17. DESCRIBEALTERNATIVESCONSIDEREDtoAV0IDoTMEASURESTAKENtoMINIMIZEand/oTCOMPENSATEfoTIMPACTStoWATERSoftheUNITEDSTATES, INCLUDING WETLANDS: See Instruclion Guide for specific details.

A total ofseven altematives were considered, including a fully offset alignment, but were not pursued due to higher costs and higher aquatic r€source impacts. The selective altemative, described in Block 16, had the lowest quantity of aquatic resource impacts.

Disturbance activities would be limited to the vicinity of the bridges and conducted for the sole purpose of bridge reconstruction and roadway alignment.

Avoidance and minimization efforts include temporary shoring during construction and permanent MSE walls, which avoids impacts to wetlands north of the Boise River and minimizes impacts to the Boise River and Ridenbaugh Canal in the vicinity of the bridge abutments. Both new bridge abutrnents would be located outside the OHWM, which would open the channel and allow better flow conditions. Removal of rip rap at the north abutment of the Boise River bridge would allow for natural/vegetated development ofthe river bank. Lastly, the reduction ofpiers in the Boise River (8 existing piers to 2 proposed piers) and in the Ridenbaugh Canal (l existing pier to 0 proposed piers) reduces obstructions in the river and allows better flow conditions.

copy of your proposed mitigatjon plan.

Wetland mitigation under Clean Water Act Section 404 is not proposed because cumulative permanent impacts to wetlands are less than 0. l0 acre.

Temporary disturbance would be refumed to pre-construction conditions and revegetated upon completion of construction activities. Stream mitigation under the Clean Water Act Section 404 is not proposed because cumulative permanent impacts to streams are less than 0.03 acre.

1 9. TYPE and QUANTITY of MATERIAL(S) to be discharged belolv the ordinary high watu ma* and/or wetlands:

Dirt or Topsoil:

Dredged Material:

Clean Sand:

Clay:

Gravel, Rock, or Stone:

Concrete:

access area/cofferdam cubic yards cubic yards cubic yards cubic yards

75 cubic yards

950 cubicyards

650 cubic yards cubic yards

TOTAL: 1,675 cubic yards

Other (describe):

Other (describe:

20. TYPE and QUANTITY of impacis to waters of tre United States, induding wedands:

32,564 sq X.

_ sqft.

sqft.

sqft.

_ sqfL

1,848 sq ft sqft

-690 sq 1

I,675 orbic yards crbic yards cubic yards cubic yards cubic yards

342 cubic yards otbic yards

-38 orbic yards

Filling: 0.748 acres

Backfill & Beddino: acres

Land Clearing: _ acres

Dredging: _ acres

Flooding:

acres

Excavation: 0.042 6spes

Drainino: acres

TOTALS: 0.774 s6yss 33,722 sq ft, 1,979 cubic yards

-0.016 661gsOfl'ler. pier removal

3rm Page 2 4

21. HAVEANyWORKACTIVITIESSTARTEDONTHISPROJECT? I ruO I YES lfyes,describeALLworkffrathasoccunedincludingdates.

22. LIST ALL PREVIOUSLY ISSUED PERMIT AUTHORIZATIONS:

Previous emergency repairs were conducted under authorization NWW-2025-00082.

23. I YES, Alteration(s) are located on Public Trust Lands, Administered by ldaho Department of Lands

24. SIZE AND FLOW CAPACITY 0F BRIDGE/CULVERT and DMINAGE AREA SERVED: 2.703 Square Miles Design Flow Capacity: 1 1,000 cfs

25. lS PROJECT LOCATED lN A MAPPED FLOODWAY? n NO ffi VeS lf yes, contact the floodplain administrator in the local govanment jsrisdiction in which the project is located. A Floodplain Development permit and a No+ise Certification may be required.

property, must obtain a Section 401 Water Quality Certification (WQC) from the appropriate water quality certifying govemment entity.

See lnstruction Guide for fuilher claification and all contact information.

The fdlowing information is requested by IDEQ and/or EPA concerning the proposed impacts to water quality and anti-degradation:

lX ruO l-l yeS ls applicant willing to assume hat the affected waterbody is high quali$?

lXl ruO f-'] Vf S Does applicant have water quality data relevant to determining whether the affected waterbody is high quality or not?

E ruO f VeS ts ttre applicant willing to collec,t the data needed to determine wheffrer the affected waterbody is high quality or not?

of water quality. All feasible altematives should be considered - beatrnent or othenvise. Selec't an altemative which will minimize degrading water quality

An IPDES Construction General Permit and SWPPP would be required for the project. BMPs would be installed prior to construction activities. BMPs may include, but would not be limited to, placing straw wattles around work and staging area perimeter and silt fence around adjacent work areas if deemed necessary. BMPs would be removed after construction.

Throuoh the 401 Certification Dfocess. watel qualitv certification will stipulate minimum manaqement orac'tice needed to prevent degradation.

27. LIST EACH IMPACT to stream, river, lake, reservoir, induding shoreline: Attadr site map with each impact location

Description of lmpact and Dimensions lmpact Length

Linear FeetActivity Name of Water Body lntermittent

Perennial aoa Affanhmant A

TOTAL STREAM IMPACTS (Linear Feet):

28. LIST EACH WETLAND IMPACT include medranized dearing, filL excavation, flood, drainage, etc. Attadr site map with each impact location.

Distance to

Water Body /linpar ftl

Description of lmpact

Purpose: road crossing, compound, culvert, etc.

lmpac't Length

(acres, square ft linear ff

Activity Wefland Type:

Emergent, Forested, Scrub/Shrub

Qoo Allanhmonl A

TOTAL WETLAND IMPACTS (Square Feet):

orm 45-1lIDWR 3804-8 Page 3 of4

29. ADJACENT PROPERTY OWNERS NOTIFICATI0N REQUIREM: Provide contact information of ALL adjacent property owners below.

Name:

Hanis Family Limited Partnership

Mailing Address:

877 W Main St Ste 501

City:

Boise

PhOne NUmbef f,irctude ffiacode)'.

Unknown

Zip Code:

83702

State:

ID

E-mail:

Unknown

Name:

City of Boise (Boise Parks & Recreation)

Mailing Address:

1104 W Royal Blvd

City: State:

Boise ID

Phone Numbef 1i, ctude qeacode1. E-mail:

Unknown Unknown

Zip Code:

83706

Name:

Nampa & Meridian Inigation District

Mailing Address:

1503 1st St S

City: State:

Nampa ID

PhOne NUmber lirctudeteacode): E-mail:

Unknown Unknown

Zip Code:

8365 l

Name:

Loyal & Velda Heyer Living Trust

Mailing Address:

4008 E Boise Ave

City:

Boise

PhOne NUmber f,i,ctude teacode).

Unknown

Zip Code:

83716

State:

ID

E-mail:

Unknown

Mailing Address:

PhOne NUmbef tmctude {eacode)i

Name:

City:

E-mail:

State: Zip Code

Mailing Address:

Phone Number 1i, ctude ffid code)', E-mail:

Name:

City: State: Zip Code

Mailing Address:

Phone Numbef fir ctude {ea code):

Name:

City:

E-mail:

State: Zip Code:

Mailing Address:

PhOne NUmber 1i, ctude tea code)i

Name:

City:

E-mail:

State: Zip Code:

30. SIGNATURES: STATEMENT OF AUTHORIAZATION / CERTIFICATION 0F AGENT / ACCESS

Application is hereby made for permit, or permlts, to authorize the work described in this application and all supporting documentation. I certtfy that the information in this application is complete and accurate. lfufther certify fhaf / possess the authority to undeftake the work descibed herein; or am acting as the duly authorized agent of the applicant (Block 2). I hereby grant the agencies to which this application is made, the right to access/come upon the above-described location(s) to inspect the proposed and completed worldactivities.

This application must be signed by the person who desires to undertake the proposed activity AND signed by a duly authorized agent (see Block 1, 2, 30). Further, 18USCSection1001 provideslhal:"Whoever,inanymannerwithinthejurisdictionofanydepaftmentoftheUnifedSfafesknowingtyand willfully falsifies, conceals, or covers up any trick, scheme, or d,.sguises a mateial fact or makes any false, fictitious, or fraudulent sfafemenfs or representations or makes or uses any false writing or document knowing same to contain any false, fictitious or fraudulent stafemenls or entry, shatt be fined not more than $10,000 or impisoned not more than five years or both".

S i gn atu re of Appl ica nt :

01t20t2025 rM-mw

Signature of Agent:

Date.

Date.

Logan Hansen 'i Dluilally signed by Logan Hansen

] DIY C-US, E=lhansen@achddaho org, O=ACHD, OU:Envnonmentat. CN=Logan Hansen' 'Orler 2026 01 20 1622:42-07'00'

NWW Form 1A 4 4

Eckert Road Bridges Attachment A - JPA Supplemental Text

Block 16: Detailed Description Derntleo DEScRtpTtoN oF EACH AcTlvlTY \MTHIN OVERALL PROJECT. Specifically indicate portions that take place within waters of the United States, including wetlands: lnclude dimensions;

equipment, construction, methods; erosion, sediment and turbidity controls; hydrological changes:

general stream/surface water flows, estimated winter/summer fiows; bonow sources, disposal locations etc.

Project activities include reconstructing and widening Eckert Road within the reconstruction of the Boise River Bridge and the Ridenbaugh Canal Bridge.

project area and

Reconstruction of Eckert Road: The project would reconstruct and widen Eckert Road on an offset alignment, relative to the existing alignment. The intersection of Eckert Road and the Barber Park driveway would shift northwest (downstream) approximately 30 feet to improve sight distance and vehicular turning movements at the Barber Park intersection. The new Eckert Road alignment would tie back into the existing alignment before Boise Avenue on the south end and before Millbrook Way on the north end. Mechanically stabilized earth (MSE) walls would be utilized at both bridges and along Eckert Road north of the Boise River.

A shared-use-pathway extends along the west side of Eckert Road for the limits of the project area, and the width varies between 10-12 feel. The path is separated from the roadway by a fence from Boise Avenue to the Barber Park Access and by a barrier over the bridges.

Boise River Bridge Replacement: The existing Boise River bridge (existing Bridge Key Number 12810), constructed in 1954 and reconstructed in 1998, is a 31S-foot long, 39.4-foot wide nine-span bridge comprised of six reinforced concrete tee beams and two prestressed concrete double tee beams with a reinforced concrete deck for the vehicle lanes. The substructure supporting the bridge utilizes two reinforced concrete abutments on timber/steel piles and eight piers. The piers have six timber piles each with full-height timber fenders on each side, two steel piles, and a reinforced concrete pier cap.

The proposed bridge (proposed Bridge Key Number 12811) would be a 364-foot long, 61.S-foot wide three-span prestressed concrete girder bridge with 0" skew. The proposed bridge would include two piers supported by drilled shafts/columns with pier caps.

Ridenbaugh Canal Bridge Replacement: The existing Ridenbaugh Canal bridge (existing Bridge Key Number 12805), constructed in '1954 and reconstructed in 1998, is a71-fool long, 43.9-footwide two-span bridge comprised of six reinforced concrete tee beams and two prestressed concrete double tee beams with a reinforced concrete deck for the vehicle lanes. The existing bridge includes one pier located within the OH\ /M of the Ridenbaugh Canal, consisting of seven timber piles with a timber sway brace, two steel piles, and a reinforced concrete pier cap.

The proposed bridge (proposed Bridge Key Number 12806) would be an 91-foot long, single-span prestressed concrete girder bridge on a21" skew. The proposed width would vary from 62.7-feet to

70.1-feet.

Construction of Proposed Bridge: Construction of the Boise River Bridge and Eckert Road would require full closure of the bridge over the Boise River. Vehicle, pedestrian, and bicycle traffic would be detoured so this bridge can be built in one phase. Vehicle traffic will be likely detoured to use Boise Ave., East Parkcenter Blvd., and Warm Springs Ave. and bicycle and pedestrian trafflc will be detoured to use adjacent pathways and the East Parkcenter Blvd.

Temporary dewatering of the Boise River would be required to remove the existing Boise River bridge prers and to construct the new bridge piers. Approximately half of the Boise River would be dewatered atati me. Larqe boulders/cobbles temporarily removed from the riverbed would be placed back into the riverbed before the dewatering dewatering activities during low of dewatering.

structure (cofferdam) is removed. The contractor would target timing flow conditions; however, at this time it is unknown the precise timing

Temporary shoring would be required to construct abutments and MSE walls at the northeast abutment of the Boise River bridge to avoid wetland impacts north of the Boise River.

The Ridenbaugh Canal Bridge would be constructed in two phases to maintain access to Barber Park, but the existing roadway and bridge will remain open in the first phase. Phase 1 would build the northern half of the new bridge downstream of the existing bridge, maintaining motor vehicle traffic on existing lanes over the bridge. The existing pathway will remain open to bicyclists and pedestrians during this phase. Phase 2 would shift motor vehicle, bicycle, and pedestrian traffic to the newly constructed portion of the new bridge and roadway. The new portion of the bridge would have barriers separating one motor vehicle lane from the permanent pathway to maintain bicycle and pedestrian connectivity. Once traffic is shifted, the existing bridge would be removed and the rest of the new bridge would be constructed. Access to Barber Park would be maintained throughout construction.

Dewatering would not be required for activities within the OH\ 4ll of the Ridenbaugh Canal.

The project would generally involve the use of excavators, backhoes, bull dozers, dump trucks, and crane(s) for the existing bridge removal and proposed bridge/retaining wall construction. Equipment is anticipated to be staged at the roadway approaches. However, staging may occur at an alternative location that would be identified by the Contractor prior to beginning construction but would be located in an upland area.

Aquatic Resource lmpact Summary: Filling activities associated with bridge construction, including embankment construction, rip rap, and new piers, would cause 0.025 acre of permanent impacts to the Boise River. No permanent fill is proposed at the Ridenbaugh Canal. Removal of the existing Boise River bridge piers (6 total) would cause a permanent increase of 0.014 acre to the Boise River.

Removal of the existing Ridenbaugh Canal bridge pier (1 total) would cause a permanent increase of

0.002 acre to the Ridenbaugh Canal. Total channel recapture area is 0.016 acre. Net channel impacts (permanent fill - recapture) is 0.010 acre.

Rip rap installation at the south abutment of the new Boise River bridge would cause 0.007 acre of permanent impact to PFO wetlands. Construction of a retaining wall and pathway on the east side of Eckert Road north of the Boise River would cause 0.012 acre of permanent impacts to PSS wetlands Total permanent wetland impacts are 0.019 acre.

Excavation for construction of the south abutment of the proposed Boise River bridge would cause

0.042 acre of temporary impacts to PFO (0.024 acre) and PSS (0.018 acre) wetlands. Contractor access to facilitate pier removal, including a dewatering structure such as a cofferdam, would cause

0.656 acre of temporary impacts to the Boise River. Contractor access to facilitate pier removal would cause 0.048 acre of temporary impacts to Ridenbaugh Canal. Totaltemporary channel impacts are

0.703 acre.

Proposed activities and existing conditions are depicted in the attached Exhibit A (Wetland Delineation Figures), Exhibit B (Temporary lmpacts), for each are Exhibit C (Permanent lmpacts). Additionally, Situation and ed in Exhibits D and E.

Block 27. Linear Stream lmpacts

Block 28. Wetland lmpacts

3. LIST EACH IMPACT to stream, river, lake, reservoir, including shoreline: Attach site map with each impact location.

Activity Name of

Water Bodv lntermittenU

Perennial Description of lmpact and Oimensions lmpact in Unear Ft

Access Area for Bridge Removal (temporary impact)

Boise River Perennial Contractor access to facilitate removal of existing piers and bridge structure, includinq cofferdam (0.656 acre)

Access Area for Bridge Removal (temporary imoact)

Ridenbaugh Canal lntermittent Contractor access to facilitate removal of existing piers and bridge structure (0.048 acre)

Total Temporary lmpacts 258

Existing Pier Removal (permanent recapture)

Boise River Perennial Removal of 6 existing piers (-0.0',l4 acre)

44 (overlaps with 215 lf for access area)

Bridge construction (permanent impact)

Boise River Perennial Construction of new Boise River bridge and embankment at south abutment (includes 41 CY of rio rao) (0.025 acre)

34 (overlaps with 215 lf for access area)

Existing Pier Removal (permanent recapture)

Ridenbaugh Canal lntermittent Removal of 1 existing pier (-0.002 acre) 43 (overlaps with 43 lf for access area)

Total Permanent lmpacts 121 linear feet (overlaps with 258 lf of temporary impacts)

4. LIST EACH WETI-AND IMPACT include mechanized clearing, fill excavation, flood, drainage, etc. Attach site map with each impact location.

Activity Wetland

Type:

Distance to Water Body

{linear ft)

Description of lmpact Purpose: road crossing, compound, culvert, etc' lmpact Length (square ft)

Excavation (temoorary imoact)

PFO Adjacent Excavation for Boise River bridge abutment (0.024 acre\

1,052

Excavation (temoorarv imoact)

PSS Adjacent Excavation for Boise River bridge abutment (0.018 acre)

Total Temporary lmpacts : 1.848 sf (0.042 ac)

Retaining wall and pathway (permanent imoact)

PSS 250 lnstallation of retaining wall and pathway (0.012 acre)

Rip rap (permanent imoact)

PFO Adjacent lnstallation of 34 cy of rip rap (0.007 acre) 317

Total Permanent lmpacts: 822 sf (0.019 ac) t

A t g' .1' :

3:

I I t

II 0 0.25 0.5

Miles I in.h eqrirls 1,000 ieet

KN1281 1

KN1 2806

Greenbelt Crossing

I t I a

Eckert Bridge Aquatic Resources Figure 1- Project Vicinity LILB Bridge Map Drawn Date: 7 /9/2A25 De[ineated Dale: 61 1 6/25 Delineated By: lan Pogue

USGS 7.5" 5e.i6 (2O1 1 ): Boise Solth, Lftky Peat f fownship/Range/SKtionl

@ Horrocks.Upper Left 1 15'9'12'W 4l'34'55'N tower Right 1 16"6'15"W 43'32'58'N Datum: WGS 1984

Ef Oelineation Boundary

LEGEND

,r EXHIBIT A i f .\ t*

I t ir f A

I0 iJ

;r.

,r'&, 'a_L l, 75 150 ffiFeet' r.an '\r.rj.. rlr L'j'

Wetland 3b Class: PFO Acres: 0.06

SP3ut oP2

Wetland 3a Class: PSS Acres: 0.01

Ridenbaugh Canal Class: R4SBC

Acres: 0.18 Linear Feet 292

Eckert Bridge Aquatic Resources Aquatic Resources lmpact LILB Bridge

Map Drawrr Darc: 7 /31 /2A25 DelirreaterJ Date' 6/ 1 6/25 Delineatecl By tarr Pogue ir)rLl.rr7 llrlnr.fuirrro5tjll Sr)r:r!r1t !:i/ lon)ic,r ijrrrn,rr fAlJ. NOAA

LIS(is i a,trn5l,drlf,1.i! {o,rlrii)rttrirl..|(: lh! Gl5 il(,'l

{$ HorrocksLill}rr l.f1r : liiu:l 1' 1i i-J'11 N

{o!il! lliqln 1ra'Iqt t^J4l ilql N

Dinrrnr \ir'6s l9&i

LEGEND

E oetineation Bounclary

O Aqr-ratic Sample Points

Ordinary High Water Mark

Classification ffi Riverine

PFO

PSS

Page I of 3

EXHIBIT A Wetland 2 Class: PSS Acres: 0.22

Wetland 1b Class: PEM Acres: 0.13

Wetland 4 Class: PSS Acres: 0.04 Wetland 1a

Class: PSS Acres:0.13

Boise River Class: R3UB1H

Acres: 1.42 Linear Feet 245

Wetland 3b Class: PFO Acres: 0.06

Wetland 5a Class: PSS Acres:0.16

Wetland 5b Class: PEM Acres: <0.01

Wetland 3a Class: PSS Acres: 0.01

\'q

Eckert Bridge Aquatic Resources Aquatic Resources lmpact LILB Bridge Map Drawn Date: 7 B1 /2025 Delineated Date: 6/16125 Delineated 8y: lan Pogue

@'Horrocks.

olmrgey M,w

Upp€rt ft I t5'8vl,l3'l.l'N lplmr Rlght 1tet52'W 13'33'5,1'N Datum: WGS 1984

LEGEND

f]] oelineation Boundary

@ Aquatic Sample Points

Ordinary High Water Mark

Classification

S nrnl

! ero

J rss

Riverine

EXHIBIT A

Wetland 2 Class: PSS Acres: 0.22

Wetland 5a Class: PSS Acres: 0.16

I I--.

tp_ii.

I o

LEGEND

EJ oetineation Boundary

O Aquatic Sample Points

Classification

1,.;-.1 Peu

I pro

F,*l.i: pss

Eckert Bridge Aquatic Resources Aquatic Resources lmpact LILB Bridge Map Drawn Date: 7 /31 /2025 Delineated Date: 6/ 16/25 Delineated By: lan Pogue

Oatum: WGS 1984 lmrgery 5qr(6 Esn, lomlor\ Gamin, FAO, NOAA USG5, € OpenstretMap cflrriburorg. and tie GIS tjw

@ Horrocks"

Maxar upper r.etr 116'7'51'w 43'3{'e"N llffir Right tl6'7'45'W 43'33'56'N sEc. 29, T,3N., R.3E

\\ d

LU

)n d\

LU\

u1 )

,i, d, .i, .rl, MSE WALL P,)

I

I

50 100

CONSERVATION AREA

(PRESERVE AND PROTECT)

TOE OF FILL SLOPE (TYP.)

\ LIMIT

a

I

.J

EXCAVATION FOR BOISE RIVER

BRIDGE ABUTN4ENT

PFO WETLAND IMPACT

(1,0s2 sF)

,i, J, ,i, il1, "t ila e

,/ EXISTIN,'i. (ro u z

TEMPORARY EXCAVATION

CONTRACTOR ACCESS AREA,

REN4OVE EXISTING BRIDGE,

CONSTRUCT BOISE RIVER

BRIDGE AND RIPRAP

(28,555 SF)

PROPOSED BRIDGE

(BK 12811)

EXISTING BRIDGE

(TO BE REMOVED)

EXISTING RIPRAP

(TO BE REMOVED)

EXCAVATION FOR BOISE RIVER

\ TEMPORARY

SHoRING (TYP.)

RIPRAP (TYP.)

PROPOSED BRIDGE

(BK 12806)

G RIPRAP

REMAIN)

MSE WALL

t \e ls e

,tlt

,t//e uLx e ,l

\ EXISTING BRIDGE

..(TO BE REMOVED)....>._J

LEGEND:

-'il'-'i'-J'- DELINEATED wETLAN D Bou N DARy

ORD]NARY HIGH WATER

(OHW) BOUNDARY

TEMP- II4PACTS TO WETLANDS

TEMP. IMPACTS BELOW OHW

BRIDGE ABUTN4ENT AND RETAINING WALL

PSS WETLAND IMPACT

(796 SF)

i t t

I

PIER REMOVAL

CHANNEL IMPACT

(2,080 sF) v uz

EXISTING RIPRAP

(TO BE RE14OVED

PROPOSED

GREENBELT PATH

s-e u s e50

SCALE: 1" = 100'

TEMPORARY IMPACTS BELOW OHW

NET IMPACT = 30,635 SF; 0.703 ACRE

TEMPORARY Ii4PACTS TO WETLANDS

TEMPORARY IMPACTS TO PFO WETLANDS = 1,052 SF; 0.024 ACRE

TEMPORARY IMPACTS TO PSS WETLANDS = 796 SF; 0.018 ACRE

NET IMPACT = 1,848 SF; 0.042 ACRE

q ECKERT ROAD I'ffi zo,fudfa*.

. -l -- i'' ri'--- -lrilt

,!,Ii :li'l I'l

ENGLISH

ADA

COUNTY

KEY NUMBER

12AOil 1)A1'l

SHEET 1 OF 4

404 PERMIT APPLICATION

ECKERT ROAD BRIDGES

EXHIBIT B

TEMPORARY IMPACTS4,41rcno Ada Gounty Highway District

F)?

SCALES SHOWN

ARE FOR 8.5'X 11'

PRINTS ONLY

CADD FILE NAME

1N4 TFMP IMPA'Tq qH-

DRAWING DATE:

IANIIARY 2N?6

DESIGNED

W MFYFR

DESIGN CHECKED

R WII IIAMq

DETAILED

R. WILLIAMS

DRAWING CHECKED

W MFYFR

sEc. 29, T.3N., R,3E d uJ )rH ,t\d1

(tu\ 91 I co

CONSERVATION AREA

(PRESERVE AND PROTECT)

,i, I

.!, .i, ,i, '!, ,i, il, .{, o .{, TOE OF FILL SLOPE (TYP.)

F

BRIDGE EMBANKMENT LIMIT

(TYP,)

RIPRAP - PFO WETLAND IMPACT

(320 SF)

e u ? \u\? s s--

+I

EXISTING RIPRAP

(TO REMAIN} EXISTING RIPRAP

(TO BE REMOVED) .;L':':'-

(TO BE REMOVED) Z

MSE WALL (TYP.)

PATH AND

f

RIPRAP AND EMBANKMENT

CONSTRUCTION - CHANNEL IMPACT Se

(787 SF)

PROPOSED BRIDGE

PROPOSED RIPRAP (TYP.)

(KN 12811)

s-

PROPOSED BRIDGE

(KN 12806)

I

I

I

I

EXISTING BRIDGE 4

(TO BE REMOVED) -- *Ur. ,/V

RETAINING WALL

C PSS WETLAND IMPACT

lL $t

... (50s sF)

PROPOSED GREENBELT PATH

Y* ,ztwPIER REMOVAL

(RECAPTURE AREA)

-\ (90 SF)....-.-\.J

e u

LEGEND

_lL_u_,{r_ rutfr t

DEUNEATED WETLAND BOUNDARY

ORDINARY HIGH WATER

(OHW} BOUNDARY

PERM. IMPACTS TO WETLANDS

PERM. IMPACTS BELOW OHW

s

0 50 100c50

SCALE: 1" = 100'

1ECKERT ROADilr^ffi iffi htb 1

J tiwf"].l. I ul

PERMANENT IMPACTS BELOW OHW

EXISTING PIER REMOVAL IN THE RIDENBAUGH CANAL = -90 5F; -0.002 ACRE

RIPRAP AND EMBANKMENT CONSTRUCTION = 787 SFt 0.018 ACRE

EXISTING PIER REMOVAL IN THE BOISE RIVER = -600 SF; -0.014

DRILLED SHAFT CONSTRUCTION = 317 SF; 0.007 ACRE

NET IMPACT = 414 SF: 0.010 ACRE

PERMANENT IMPACTS TO WETLANDS

PERMANENT IMPACTS TO PFO WETLANDS = 320 SF; 0.007 ACRE

PERMANENT IMPACTS TO PSS WETLANDS = 505 SF; 0,012 ACRE

NET IMPACTS : 825 SF: 0.019 ACRE

I t.

L

'r i'v t?

EXISTING BRIDGE

(TO BE REMOVED)

PIER REMOVAL, TYP.

(RECAPTURE AREA}

(600 SF, 75 SF EACH}

DRILLED SHAFTS, TYP.

CHANNEL IMPACT

(317 5F, 53 SF EACH)

ENGLISH

COUNTY

ADA

KEY NUMBER

1)Rn6t1)P.'t 1

SHEET 2 OF 4

404 PERMIT APPLICATION

ECKERT ROAD BRIDGES

EXHIBIT C

PERMANENT IMPACTSz4=_AoHD Ada County Highway District

F)?

SCALES SHOWN

ARE FOR 8.5'X 11'

PRINTS ONLY

CADD FILE NAME

IO4 PERM IMPACTS.SH'

DRAWING DATE:

IANUARY 2026

DESIGNED

W MFYFR

DESIGN CHECKED

R WII IIAMq

DETAILED

R. WILLIAMS

DRAWING CHECKED

W. MFYER

EXHIBIT D

91L5" OUT-TO-OUT

(MEASUREd ALONG'LAYOUT. LINE).\\

NNTFC

89L0'q BlrG B RG. '-2'6', 1.

*2.

"* 3.

4.

DIIT4ENSIONS V]EASURED PERPENDICULAR TO BRIDGE

LAYOUT LINE UNLESS NOTED OTHERWISE.

DIMENSION MEASURED PERPENDICULAR TO q ECKERT

RD. WTTHIN BRIDGE AND APPROACH SLAB LIMITS.

DIMENSION MEASURED PERPENDICULAR TO LEFT EDGE

OF DECK.

STATIONS AND OFFSETS ARE REPORTED WITH RESPECT

TO q ECKERT ROAD.

21'00'00' (TYP. )

(MEASURED ALONG LINE)

UzU

a. ABUT.2

BRG.

oz o

U = HIGH

MARK (OHWM) (TYP.)

PI 13tqg,1!

tloBLz!4fa!]l!qryEuI -o tF 14.60' LT CURVE DATA

ECKERT RD.

MSE

o c I Io oc:

Pl=409+35.7 I

A=33'52'28" RT

D= 13'28'5 3"

END

T= 129.43' L=251.27'

R:425.00'LINE

11.80,17

POE 14f00

225' VC

BRIDGE END BRIDGE 410 + 00STA.

F.G. 73

STA.409+75.20

F.G. ELEV .68

j q

F gs o@

Eg z$

0<UF

q j U e n t ts

_rR

2F

_l -o\ ',4s-"lz-.2

?\t-6 to

Yiun

2OLO'APPROACH

SLAB (TYP.)

METAL GUARDRAIL, SEE

ROADWAY PLANS (TYP,)

, REMOVE EXISTING BRIDGE

a (DWG. No. 6404 & 6404-8)

VPI STA.409+0s.00

ELEV.2772.AS

PLAN

1'=20'-0"

PROFILE OATA - q ECKERT ROAD

NTS

FIN15HED GRADE

q nng, neqrr 1-f LEGEND:

ORDINARY HIGH WATER

(OHW) EOUNDARY

sTA. 408+85.5 I

METAL GUARDRAIL, SEE

ROADWAY PLANS (TYP.)

F z tr i F HVhDAI II I' hATAWINGWALL HIGH WATER

MSE WALL

H.W. ELEV.

.. I 2755.50 \ !v-

12.6' CLR. CANAL FLOW

H.W. ELEVATION

VE LOCITY

FLOW CONTROLLED BY

550 cfsFINISHED GRADE

HP STEEL PILES (TYP.)

WINGWALL 2755.50 ft

2.4 fps

NAN]PA-MERIDIAN IRRIGATION DISTRICT

FINISHED GRADE

ELEVATION

1"=20t0"

APPROXIMAIE EXISTING GROUND

ALONG RIGHI EDGE OF PROPOSED BRIDGE

ARE FOR 1I" X 17"

PRINTS ONLY

SITUATION AND LAYOUT BRIDGE PLANS

FILE 91' PRESTRESSED CONCRETE GIRDER BRIDGE

ECKERT ROAD OVER RIDENBAUGH CANAL

ECKERT ROAD STA. 409+29.73

Dxtsdxxxrnkoiodsdlqafl $r

NO.

Q BRG. ABUT. 2

sTA.409+73.95

F.G, ELEV,2772.69

PO]NT OF MIN.

q BRG, ABUT. I sTA.408+85.51

F.G. ELEV.2774.69

VERT, CLR.

(H.W. ELEV.)

t ...1..... _,.,. .

a, ST 1.71'LT

ECKERT ROAD & P.G.L.

LAYOUT LINE

N4-;lii14;w

BRG. ABUT.2

LAYOUT UNEI

A.409+68.48, -ro

BRIDGE

, LT,

@ LAYOUT LINE

sTA.408+80.89, DATE:

4ft-aan

ENGL I SH

KEY

DATE DATE

o e

EXHIBIT E

I l

PARK DRIVEWAY t\ 2'-O'2 /lr"o: 121

BRG. ABUT. 1

HIGH WATER410 +62.06 ORDINARY

I r

RIPRAP (TYP.)

F.G. ELEV.2772.06 PIER 2

MsE

Y^uL SLAB PIER 1 sTA.413+02.56

STA.

F.G.

411+81-56 ELEV. 2

ELEV. 277 1.46

sTA.14+00.00 tslo ot;

ts f o

ECKERT

BRG,

4 b

<y

PIER 2 21

q BRG. ABUT, 2

REMOVE EXISTING BRIDGE

(DWG. NO. 6404 & 6404-4)

END

F.G. EIEV.2770.25

PLAN

1'=50L0"PRO RIDENBAUGH

CANAL BRIDGE

CURVE DATA - ECKERT ROAD

a=33.s2'26. RT.

T= 129.45' L=251.27' R=425.00' 5= 1.5%

PC 5TA.=408+06.28

PT STA.=410+57.55

BRG. lN=N24'20'20'E BRG. OUT=S3r'47'13'E

-o.50/.

HYDRAT'I IC DATA

FLOOD DISCHARGE H.W. ELEVATION VELOCITY

DESIGN (Q5O) 11,000 cfs 2'157.9 ft 7.1 fps BASE (Q100) 16.600 cfs 2759.6 ft 8.0 fps scouR (Qsoo) 38.800 cfs 2762.2 ft 10.0 fps

.! ori

EN

: u.l <il

^t xR :q$d

<,;FY

q j u

360',-0'c BRG. TO 0 BRG.

o a

=0 o Fq oo oz

I 19',-6' 1 19L6" I

PROFILE DATA - q ECKERT ROAD

PAN 1

. SPAN 3

q PIER 2 l-sra. +r:rozso

NTS

METAL GUARDRAIL,

SEE ROADWAY PLANS

FINISHED GRADE

H.W.

2757.9

STA. 414+22.06

MIN. VERT

COMBINATION RAILING QrOO H.W.

E1EV.2759.6

CLR. OVER Q50

3.3 MIN. VERT.

CLR. OVER Qroo

LEGEND:

ORDiNARY HIGH WATER

(OHW} EOUNDARY

F E 2i7o

27 40 zo tr

MSE WALL

APPROXIPIATE EXISTING

GROUND@qECKERTROAD MSE WALL

DRILLED SHAFT

ITYP. AT ABUTMENTS)

ELEVATION DRILLED SHAFT

(TYP. AT PIERS) FINISHED GRADE

ARE FOR 11' X SITUATION AND LAYOUT BRIDGE PLANS

PRESTRESSED CONCRETE GIRDER B

ECKERT ROAD OVER BOISE RIVER

ECKERT ROAD STA. 412+42.06

Kil NO.

1281 r l- rt'-0" '-nrue

-f-rr'-0,, rwLr LANE-:

J ri.o" ur,re

1L2" COMB, RAIUNG I

t

1'-2'COMB. RAILING

414 + 00

,O'-0" trar,-rre ,or" \

F.G. ELEV. 2770.26

1'-2. COMB. \. .

RAILING ]

f'

EAST BOISE

AVENUE .:

ATOq ECKERT ROAD & P.G.L.

4l I +00

N58.12'47'E

A 413+OOTO SOUTH,

MILLBROOK WAY

urduxnhoF*sildsfbii -4ft-ecno

ENGL I SH

364'

Joint Permit Application Attachment B - Photographs east.area2. View River

Photo 4. Boise River Bri northeast.north abutment west.

Photo 1. View of westRoad over Boise

Photo 3. View of Boise

River Quarry at Parkcenter4l2 E. Parkcenter Blvd. Suite 100Boise, lD 83706-6659

(208) 387-7000 hdrinc.com

Joint Permit Application Attachment B - Photographs

River Quarry at Parkcenler4l2 E. Parkcenter Blvd. Suite 1OoBoise, lD 83706-6659

(208) 387-7ooo

CanalPhoto 8. View of

Photo 6. View of Boise River Bridge north abutment area and Boise River, facing west.

northwest.h CanalPhoto 7. View of Riden

Photo 5. View of Boise River Bridge south abutment area and Boise River, facing west.

hdrinc.com

LILB Bridge #: 12810 District #: L3 County: Ada

Sponsor: Ada Gounty Highway District Crossing: Eckert Rd over the Boise River Latitude and Longitude: 43.565653, -'l 16.132225

RECEIVED

Jan 23,2026

DEPARIMENT OF

WATER RESOURCES

Envi ronmental Summary Document prepared for the US Army Corps of Engineers (USACE) prepared by Leading ldaho Local Bridge Program (LILB) Local Highway Technical Assistance Council (LHTAC)

USACE Permit Type

Which water 401 Quality Certification is required X DEQor! EPA n lndividual Water quality Certification

X General Water quality Certification

EPA/DEQ Prefiling request sent to:

Other Applicable Permits Date sent:

TribalAnd FederalAgency Coordination (attach pre-coordination documentation)

Type n Tribal - Reservation (list the…