City_of_Boise_Approval_Permit_Letter.pdf

August 7, 2026

Logan Hansen Ada County Highway District 5800 N Meeker Avenue Boise, ID 83713 lhansen@achdidaho.org (Sent via email)

Re: CFH26-00058/ 2451 S Cloverdale Road/ Floodplain

Dear Applicant:

Your application for a staff level Floodplain Permit has been reviewed and approved under Boise City Code (BCC) Section 11-02-07.3.F (FP-O Flood Protection Overlay) based upon the plans and application information submitted to the Boise City Planning and Development Service department, date stamped received on July 7, 2026, the application is approved. This section of Boise City Code outlines requirements designed to protect life and property, and health and safety, from periodic flooding in areas within the floodway, floodway fringe, and area of shallow flooding zones. In approving the application, the Planning Team must make specific required findings as noted below and must notify the applicant in writing of the findings and conditions of approval.

PROJECT PROPOSAL

The applicant requests approval of a Floodplain Permit to replacement and install a new culvert under Cloverdale Road. The culvert is located within the AE floodplain associated with Eightmile Creek. The project area is not located within floodway. The new culvert will convey Eightmile Creek under Cloverdale Road, which will be widened to five lanes.

The project is located within the right-of-way, and it is generally addressed at 2451 S Cloverdale Road. The Ada County Highway District (ACHD) is expanding Cloverdale Road to a five-lane arterial roadway with a 10-foot-wide multi-use pathway on both sides of the street. As such, the project will replace the existing 36 x 48-inch elliptical corrugated metal pipe with a 48-inch reinforced concrete pipe and increase length of the pipe under the roadway from approximately 60 to 97 feet. The culvert replacement and installation will not impact the surrounding area. In addition, the application submitted a “No Rise” analysis indicating the project is not negatively impact the floodplain or surrounding area.

mailto:lhansen@achdidaho.org

CFH26-00058 | Administrative Approval | 2451 S Cloverdale Road | Issued August 7, 2026 | Page 2 of 5

BOISE CITY ZONING ORDINANCE

Section 11-02-07.3.F.(3) Flood Fringe (FF) Zone and Area of Shallow Flooding (ASF) Zone

FINDINGS OF FACT AND CONCLUSIONS OF LAW

1) Except for levees, all new development shall utilize methods and practices that minimize development and prevent the increase in flood damage potential to other properties or other adverse impacts including but not limited to, bank erosion resulting from higher velocities, increased heights of floodwaters, extended flood duration, or alterations that may promote channel blockage.

Findings: The development will utilize methods and best management practices to minimize development and prevent flood damage in accordance with Idaho Department of Water Resources, and Army Corps of Engineers guidelines.

2) All new development shall utilize materials and utility equipment resistant to flood damage.

Findings: ACHD will install a new culvert under Cloverdale Road as part of a roadway improvement project. The project will replace the existing culvert 36 x 48-inch elliptical corrugated metal pipe with a new 48-inch reinforce concrete pipe. In addition, culvert installation includes the construction of headwalls and wingwalls and a box structure on the east and west side of the roadway, respectively. The culvert installation project shall utilize flood resistant materials.

3) All new construction and substantial improvements to structures shall be anchored to prevent floatation, collapse or lateral movement of the structure resulting from hydrostatic and hydrodynamic loads including the effects of buoyancy.

Findings: The culvert installation shall be buried under the roadway with a headwall and wingwalls and box structure anchoring project on the east and west side of the roadway, respectively. As such, the structures be anchored and will not be at risk of collapse, lateral movement or floatation.

4) All manufactured homes must likewise be anchored to prevent flotation, collapse or lateral movement, and shall be installed using methods and practices that minimize flood damage. Anchoring methods may include, but are not limited to, use of over-the–top or frame ties to ground anchors (Reference FEMA’s Protecting Manufactured Homes from Floods and Other Hazards FEMA P-85 11/2009 for additional techniques).

Findings: The application is not for a manufactured home or structure.

5) Drainage practices shall be used that minimize exposure to flood hazards.

Findings: A condition of approval will require the maintenance work to utilize best management practices that minimize exposures to flood hazards.

CFH26-00058 | Administrative Approval | 2451 S Cloverdale Road | Issued August 7, 2026 | Page 3 of 5

6) Manufacture and/or storage of material that is buoyant, flammable, toxic or explosive is prohibited.

Findings: The project is for the installation of a culvert under Cloverdale Road.

Therefore, the applicant does not plan to have buoyant, flammable, toxic and explosive materials stored or manufactured within the floodplain during or after the project is complete.

7) River crossings shall be designed to withstand the flows and velocities of the base flood discharge and shall not impede the flows.

Findings: The application does not include a new river crossing.

8) All development and structures shall meet or exceed the requirements of Section

11-02-07.3.E, BR-O: Boise River System Overlay, if applicable.

Findings: The project is located within Eightmile Creek and a River System permit is not required.

9) Water velocities within the Floodway Fringe are not significantly increased as to cause adverse effects on the site or to surrounding properties.

Findings: A condition of approval requires appropriate grading and ESC permits from the City of Boise prior to commencing work. These applications will verify the proposal does not significantly increase water velocities within the floodway fringe.

In addition, the applicant submitted a “No Rise” analysis for the project.

10) Require adequate drainage paths around structures on slopes to guide floodwaters around and away from proposed structures.

Findings: No structures on slopes are located within the proposed work area. All drainage paths should adhere to IDWR, and ACOE conditions of approval for their respective permits.

CONDITIONS OF APPROVAL

1. Construction, use and property development shall be in compliance with plans and specifications on file with the Boise City Planning and Development Services Department date stamped received on July 9, 2026.

2. Applicant shall obtain appropriate grading, and ESC permits from the City of Boise prior to commencing work. All construction materials used shall be floodproofed and anchored to prevent floatation and the applicant shall use best management practices to minimize exposures to flood hazards.

CFH26-00058 | Administrative Approval | 2451 S Cloverdale Road | Issued August 7, 2026 | Page 4 of 5

3. All disturbed areas caused by construction shall be stabilized and revegetated as soon as possible.

4. No material shall be stored and left within the delineated floodplain portions of the project area during construction. Stored materials may cause floodwaters to enter areas that were not prone to flooding and/or materials may be washed away and cause damage downstream.

5. Permits for this project may be required from the U.S. Army Corp of Engineers and the Idaho State Department of Water Resources. Project must comply with all jurisdictional requirements noted in the permits. If required, these permits must be supplied to the City prior to issuance of any permits for construction.

6. Comply with the requirements stated within the Boise City Planning and

Development Services Floodplain review letter dated August 7, 2026. For additional information contact Jesi Lile at (208) 608-7857.

7. The applicant shall comply with the requirements of the Boise City Public Works

Department (BCPW). The following is a list of department comments by division:

a. Sewer (July 22, 2026);

b. Solid Waste (July 16, 2026);

c. Drainage; and

d. Street Lights (July 22, 2026).

Please contact BCPW at (208) 608-7150. All items required by BCPW shall be included on the plans/specifications that are submitted for a Building Permit. Please note that any changes or modifications by the owner to approved plans must be submitted to the Public Works Department for approval.

8. The applicant shall comply with the requirements of the following agencies as identified in their submitted memos:

a. Ada County Highway District;

b. Boise City Parks Department (July 21, 2026);

c. Boise City Building Department;

d. Central District Health Department;

e. Boise City Fire Department (July 16, 2026);

f. Irrigation District; and

g. Century Link.

May we also take this opportunity to advise you that this approval will not take effect until after the ten (10) day appeal period has lapsed without an appeal being filed. This decision of the Boise City Planning and Development Services Department may be appealed to the Boise City Planning and Zoning Commission within ten (10) days from the date of issuance of this decision. All appeals of this permit must be filed by 5:00 P.M.

CFH26-00058 | Administrative Approval | 2451 S Cloverdale Road | Issued August 7, 2026 | Page 5 of 5 on August 17, 2026. The appeal must be written, accompanied by the appropriate fee, and submitted to the Boise City Planning Division prior to the deadline set forth above.

Appeal application forms are available at the Boise City Planning and Development Services Department, Second floor, Boise City Hall, 150 North Capitol Boulevard, Boise, Idaho 83701-0500 or online under Applications at: cityofboise.org/pds-appeal.

If you have any questions, please contact me at (208) 608-7087 or dmoser@cityofboise.org.

Sincerely, David Moser Senior Planner, Planning and Zoning Boise City Planning and Development Services

DM/

cc: Marisa Keith / Southwest Ada County Alliance Neighborhood Association / swadacounty@gmail.com

The City of Boise Planning and Development Services Department acknowledges the ancestral, cultural, traditional, and unceded territory of the Shoshone, Bannock, and Northern Paiute people on which our land use and development decisions are made.

https://www.cityofboise.org/pds-appeal mailto:dmoser@cityofboise.org mailto:swadacounty@gmail.com