AOP_Boundary_Creek_Hydraulics_Memo_Final.pdf

Memorandum

Western Federal Lands Highway Division 610 E. Fifth Street

Vancouver, WA 98661-3801

BOUNDARY CREEK FISH PASSAGE IMPROVEMENTS

FINAL AOP HYDRAULICS REPORT v4

To: Craig Sanders, WFLHD Project Manager From: Sven Leon, P.E., WFLHD Hydraulics Engineer Date: October 20, 2022 Project: Granite Hill Road Reconstruction – OR GRANT 24(2)

Background

Grant County (County), Oregon, is reconstructing 9.32 miles of the Granite Hill Road (CR 24) between the County boundary and Granite, Oregon (Fig. 1). The proposed work maintains current roadway widths. Ditch relief culverts will be added for improving drainage. Excavation and repair of localized subgrade areas will also be performed. The existing pavement will be rehabilitated. Culverts on Bull Run Creek will be replaced with bridges and Aquatic Organism Passage (AOP) culverts. Boundary Creek culvert will be replaced with an AOP culvert. The County maintains the road and drainage structures.

Western Federal Lands Highway Division (WFLHD) is designing the road improvements. Final recommendations for aquatic organism passage (AOP) culvert design at Boundary Creek are presented.

AOP Design Criteria

The new culvert replaces a 36-inch by 60-inch CMP arch. Boundary Creek is a tributary to Bull Run Creek. Bull Run Creek flows into Granite Creek, which is a tributary to the North Fork John Day River.

The North Fork John Day River and many of its tributaries support federally listed Endangered Species Act (ESA) fish species. Bull trout, steelhead, and chinook are designated as critical habitat unit (CHU).

Fish passage is required by Oregon Revised Statute (ORS) 509.580, the ESA, and the Magnuson-Stevens Fishery Conservation and Management Act. The recommended fish passage crossings designs are consistent with requirements of the Standard Local Operating Procedures for Endangered Species (SLOPES). SLOPES requires Fish Passage Restoration actions to provide passage for adult and juvenile fish consistent with current NMFS fish passage criteria.

The proposed designs are consistent with the Streambed Simulation Design Method (NMFS Anadromous Salmonid Passage Facility Design, July 2011). This method provides a simplified design methodology that is intended to mimic natural upstream and downstream processes within the culvert. Fish passage, sediment transport, and debris conveyance within the culvert are designed to function as they would in the adjacent natural channel. Determination of the high and low fish passage design flows, water velocity, and water depth is not required for this method, since the stream hydraulic characteristics within the culvert are intended to mimic the stream conditions upstream and downstream of the crossing. The method utilizes streambed materials that are like the adjacent channel, providing similar channel complexity, flow depth, flow velocities, and resting areas.

Culvert Width: Minimum culvert bed width is 1.3 times the bankfull channel width.

Memo to: Craig Sanders, WFLHD Project Manager October 20, 2022

Channel Vertical Clearance: Clearance from bed to ceiling must be at least 6 feet to allow for construction access and debris removal.

Channel Slope: Reconstructed streambed within the culvert should approximate the average slope of the adjacent stream from approximately ten channel widths upstream and downstream of the culvert site, and should not exceed 6 percent.

Embedment: Bottom of the culverts should be buried into the streambed between 30 and 50 percent of the culvert height, and a minimum of 3 feet.

Maximum Length of Road Crossing: Length should be less than 150 feet.

Fill Materials: Fill materials are comprised of material similar in size composition to natural bed materials that form the natural stream channels adjacent to the road crossing. Larger material is added for assisting stream gradient retention and providing resting areas for migrating fish.

Water Depth and Velocity: Water depth and velocity in the culvert must closely resemble those existing in the adjacent stream.

Site Conditions

The existing 36-inch by 60-inch corrugated metal pipe (CMP) arch culvert is approximately 600 feet upstream of the Bull Run Creek confluence (Fig. 3, Photos 1, 2, and 3). The stream is aligned relatively straight to the road (Photos 4 and 5). A beaver dam is observed near the confluence (Photo 6). The beaver dam has backwatered Boundary Creek between the confluence and the culvert outlet. The existing culvert is corroded. There are National Forest Service structures 400 feet upstream on the Boundary Creek left bank (looking downstream).

Abundant placer mine tailings are found in the Bull Run Creek valley floor extending from the road embankment to the south valley wall and upstream and downstream of the culvert site. The tailings top surface elevations are 6 to 10 feet higher than the adjacent channels and have confined Boundary Creek against the road embankment (Photos 7 and 8). The mine tailings between Boundary Creek and Bull Run Creek may be excavated for providing a project aggregate source.

The Confederated Tribes Umatilla Indian Reservation and the U.S. Forest Service is currently restoring the Bull Run Creek floodplain. Restoration work will include a new Bull Run Creek channel and fish habitat. The new Boundary Creek AOP culvert outlet channel will need to connect with the new Bull Run Creek channel.

The existing Boundary Creek channel between the culvert and confluence with Bull Run Creek will not be modified from its current condition. The existing channel will be preserved as off-channel habitat for Bull Run Creek.

Boundary Creek is relatively stable. Stream banks are well defined. Both upstream and downstream the active channel width was measured at approximately 8 feet (Photos 9, 10, and 11). Active channel depth is 1 foot. Bankfull width measured upstream by the Forest Service was 10 feet. Bankfull depth was not measured. Flood-prone width is 20 to 30 feet. Flood-prone depth is 2.5 feet. Channel gradient is approximately 5 percent upstream and 1 percent downstream. Riffle-run and pool-riffle are the dominant bed forms. Log sills and cobble sills control the stream profile. Streambed material gradation measured by pebble count is D100 8 inches, D85 6 inches, D50 2 inches, and D15 of gravel. The banks are moderately stable where vegetated. Bank erosion occurs where sediment and woody debris in the channel deflect stream flow towards an erodible bank (Photo 12). The bank toes tend to quickly armor, limiting the erosion extent. Woody debris and sediment plugs can force channel avulsions.

Bull Run Creek is relatively stable. Plan form and channel characteristics are strongly influenced by the mine tailings. Both upstream and downstream the active channel width was measured at approximately 10 to 12 feet (Photos 13, 14, and 15). Active channel depth is 2 feet. Flood-prone width is 20 to 30 feet.

Flood-prone depth is 4 feet. Channel gradient is approximately 2 percent. Step-pool and pool-riffle are the dominant bed forms. Log sills and boulder sills control the stream profile. Streambed material gradation measured by pebble count is D100 10 inches, D85 8 inches, D50 2 inches, and D15 of gravel.

The banks are moderately stable where vegetated. Bank erosion occurs where sediment and woody debris in the channel deflect stream flow towards an erodible bank. The bank toes tend to quickly armor, limiting the erosion extent. Woody debris and sediment plugs can force channel avulsions.

Based on potential flood depths and available wood, both streams can likely carry a large amount of small to moderate sized woody debris. Stream flow when fish passage is needed is often small. Smaller flows could submerge into excessive amounts of bed material or large stone placed inside the proposed culvert or at the outlet.

Recommendations:

Remove existing CMP arch culvert.

Install precast concrete box culvert 34 feet long, 13.0-foot span, and 12.0-foot rise (Sheets H.10 and H.11).

Align culvert centerline with road centerline 90 degrees.

Bevel culvert end sections 1.2 degrees.

Install precast concrete wingwalls at the inlet and outlet, 12 feet long and 45-degree flare.

Countersink culvert 4 feet at outlet and 4.8 feet at inlet and backfill with conserved streambed material.

Set interior channel grade to match the existing natural channel grade (4.9 percent).

Set culvert slope to 1.9 percent.

Place 30-inch diameter stones on the conserved streambed material for providing fish passage flow roughness.

Install 2.5 feet wide by 1.5 feet high cobble-boulder banks along both culvert walls.

Install Class 3 riprap (FHWA FP-14) along wingwalls.

Provide at least 6 inches of cover over the proposed culvert crown.

Construct new 117 feet long, sinuous outlet channel from new culvert to the new Bull Run Creek channel.

Construct new outlet channel with 8 feet bottom width, 2(h):1(v) side slopes, and 4.9 percent grade (Sheet H.21).

Provide aquatic habitat and bank erosion control by installing wood structures at each of the new channel bend apexes (Sheets H.10 and H. 23).

Control bank erosion along new outlet channel by planting willow poles (Sheet H.20, H.21, and H.22).

Install willow pole tripods for improving stream cover and reducing streamflow heating (Sheet H.20 and H.22).

Place a deflector rootwad near the culvert outlet as needed for diverting a portion of the stream flow towards the old channel and wetland area (H.10).

Place six deflector rootwads randomly on the restored floodplain surface as directed by the CO.

Seed and plant any disturbed areas with local native vegetation.

Construction

Work within the ordinary-high-water limits can only be performed between July 15 and August 15.

Construction is expected to take longer than 4 weeks for this and the other culverts and bridges. A time extension might be negotiated with the resource agencies. Higher stream flows can occur in early July.

Moving the start date up is not recommended. I recommend extending the ending beyond August 15.

Temporary flow defectors placed for isolating the work area and diverting the stream flow must have a minimum height of 3 feet above the stream bottom and be stable assuming 8 feet per second parallel flow.

Use plastic-lined channels or pipes for temporally conveying stream flow through the construction area.

Protect the outfalls from erosion. Fish passage downstream through the temporary flow diversions is required. Ensure fish can pass smoothly from the upstream diversion point to the downstream diversion point. Locate diversion points in the main stream channel. Fish passage upstream is not required.

Temporary flow diversions for Boundary Creek in-stream construction during lower flow periods, July 15 through October 15, must have a minimum flow capacity equal to at least 10 cubic feet per second (cfs).

Bull Run Creek diversions within this timeframe must have a minimum capacity equal to at least 50 cfs.

Temporary stream diversions in place during higher flow periods, October 16 to July 14, must have minimum flow capacity equal to the 2-year discharge (41 cfs). Bull Run Creek diversions within this timeframe must have a minimum capacity equal to at least 152 cfs. Before installing the flow deflectors, remove fish from the work area to the level and methods specified in the environmental permits.

Access for culvert installation work will be accomplished within the existing road embankment footprint.

Temporary access routes down and adjacent to the road embankments are needed for installing flow barriers and completing culvert, inlet, interior, and outlet work. Constructing the proposed culvert and in-stream work may require heavy track-mounted equipment operating on the stream bed, possibly in water up to 2 feet deep. Placer mine tailings excavation, outlet channel construction, wood structure placement, and willow pole planting are expected to be entirely within the tailings area and above the Bull Run Creek ordinary-high-water level.

The State of Oregon and the U.S. Fish and Wildlife Service will restrict the release of turbidity from the work areas into the stream. The agencies require turbidity control and monitoring and should be contacted for specific requirements and allowable discharge limits.

Stream Impacts

The proposed fish passage culvert is expected to provide stream flow conveyance, sediment transport, and woody debris transport to a level that is like the adjacent natural stream. The existing natural boulder and cobble sills limit any potential stream profile degradation. Some incision of the constructed channel and minor upstream head cutting is expected and should be encouraged.

A moderate amount of turbidity and sediment is expected to be released when the flow barriers are removed and stream flow is introduced into the newly constructed culvert. The amount of turbidity and

October 20, 2022 sediment will be reduced by removing the flow barriers gradually introducing the stream flow over an extended two to three-hour time.

Floodplain and Flood-rise Impacts

The site is not mapped by the Federal Emergency Management Agency (FEMA) as being in a special flood hazard area. A detailed FEMA mapping study has not been completed for the site. No base flood elevations have been determined. There are insurable structures 350 feet upstream on Boundary Creek.

The proposed culvert is not expected to impact flooding of these structures.

Operation and Maintenance

Woody debris will tend to accumulate at the culvert inlet and inside the culvert. The County should inspect the culvert annually and remove any accumulated woody debris. Riprap placed at the culvert inlet and outlet should be inspected annually and after each extreme flood event. Replace or reposition dislodged stone.

Banks constructed in the culvert will likely scour away with heavy flooding. Boulders placed inside the culvert may move. Cobble and boulder sills will develop. Bank loss, boulder movement, or sill formation will not negatively affect fish passage performance.

Hydrology

Peak discharges were estimated using USGS regression equations from Estimation of Peak Discharges for Rural Unregulated Streams in Eastern Oregon (USGS Open File Report SW 06-001, 2006). USGS StreamStats (version 4.3.8) web-based application was used for delineating the watershed and calculating drainage area 4.41 sq. miles, mean basin slope 17.2 degrees, mean January precipitation 3.54, mean minimum January temperature 18.4 degrees, and average soil depth 33.2 inches (Fig. 2). Mean annual precipitation for the project area is 30.2 inches. The watershed is entirely within the Umatilla National Forest and covered with 77 percent forest. Clear-cut logging has occurred and can occur in the future.

No flow diversions or lakes occur. The drainage areas are steeply mountainous with moderately incised drainages. Elevations range from 4720 to 8300 feet (NAD83/WGS84). Stream length is approximately 7 miles. Low stream flow periods occur from late July through late October. Higher flows occur with heavy rain, rain-on-snow, and snow melt in November through early July. Peak discharges estimates are presented in Table 1.

Cold stream water is found in the reaches upstream of the road embankment. To survive and thrive, salmonids must be able to access this cold water refugia at all life stages and stream flows. The project allows full access to this critical cold water refugia.

Culvert Hydraulics

Initial flow depths and average velocities for the new outlet channel and the channel inside the culvert were calculated with FHWA Hydraulic Toolbox, version 4.2, open-channel flow calculator. Boundary Creek calculations assumed 8 feet channel bottom width, 1:1 sides slopes, 4.9 percent channel slope, and

0.040 Manning’s Roughness coefficient. The Manning’s Roughness coefficient was iterated until a Froude number of 1.0 was achieved for the 2-year discharge. This represents the minimum energy for the stream and the channel inside the culvert and models the turbulent nature of natural steep-gradient, cobble-bedded streams.

Hydrologic Engineering Center River Analysis System (HEC-RAS 5.0.3) two-dimensional, unsteady flow model was used for estimating the proposed culvert water surface elevations, flow depths, and flow velocities. Terrain for the proposed culvert model was created by modifying existing ground topography and bathymetry obtained from project mapping to reflect the proposed culvert span, length, and channel grading. Models were developed assuming the mine tailing area was excavated and not excavated. The model uses a mesh with 2 feet by 2 feet grid spacing extending 160 feet upstream Boundary Creek, 800 feet upstream Bull Run Creek, and 700 downstream Bull Run Creek (Fig. 7). Normal flow depth with

0.02 feet/feet friction slope was set for the downstream boundary condition. Twelve-hour duration, 1-minute interval hydrographs were used for the upstream Boundary Creek and Bull Run Creek boundary conditions. The hydrographs include the 2, 10, 25, 50, 100, and 500-year flood flows. The model was calibrated with apparent bankfull and high-water levels determined in the field. A Manning’s Roughness Coefficients of 0.040 was selected for the main channel area. Peak flooding occurs in May, June, and early July before the dense wetland vegetation on the floodplain is fully leafed. A Manning’s Roughness Coefficients of 0.08 was selected for the floodplain and island areas. The model uses a 4 second computation interval, full momentum equation set, and 2-hour warmup time. Flow depths, water surface elevations, and design flow velocities are summarized in Figures 4, 5, and 6.

attachments: Table 1 Figures 1 through 7 Photographs 1 to 15 Drawings H.10, H.11, H.12, H.13, H.14, H.20, H.21, H.22, H.23, and channel profile Cost Estimate Peak Discharge Estimates james.g.neighorn Cross-Out james.g.neighorn Cross-Out

Drainage

Location Area (mi2) 2 5 10 25 50 100 500

Bull Run No. 1 7.52 57 NA 105 138 161 184 241

Bull Run No. 2 14.5 91 NA 164 215 249 283 367

Bull Run No. 3 23.7 152 NA 272 355 411 467 604

Bull Run No. 4 30.3 190 NA 335 435 502 569 733

Boundary Creek 4.41 41 NA 79 105 123 141 186

Notes:

NA = Not analyzed.

1. Estimation of Peak Discharges for Rural, Unregulated Streams in Eastern Oregon (Open

File Report SW 06-001, 2006).

Table 1. Peak Discharges (ft3/sec)

Recurrence Intervals (years)

Culvert Location

Bridge Location

Project Site Location

Image from Google Earth Pro, image date 6/12/2015

N

Bull Run Creek 4

FIGURE 1

GRANITE HILL ROAD

SITE LOCATION

0 2 miles

Start Project

Boundary Creek

Bull Run Creek 1Bull Run Creek 2

Bull Run Creek 3

End Project

Image from Google Earth Pro, image date 6/12/2015.

N

FIGURE 2

GRANITE HILL ROAD

DRAINAGE AREA

0 2 miles

Bull Run Creek 4

- 30.3 sq. miles

Bull Run Creek 3

- 23.7 sq. miles

Bull Run Creek 2

- 14.5 sq. miles

Bull Run Creek 1

- 7.5 sq. miles

Boundary Creek

- 4.4 sq. miles

Image from Google Earth Pro, image date 6/12/2015.

FIGURE 3

GRANITE HILL ROAD

BOUNDARY CREEK

0 300 feet

Mine Tailings Excavation Area

Boundary Creek New Channel

Boundary Creek Old Channel - Preserve Existing Conditions

Boundary - Bull Run Creek Confluence

HECRAS 5.0.7 - Two-Dimensional hydraulic model.

Flow Velocity (Feet/sec)

N

Design Value Location

FIGURE 4

GRANITE HILL ROAD

100-YEAR FLOW VELOCITY

2-yr

500-yr 100-yr

25-yr

10-yr

50-yr

0.5

1.5

2.5

3.5

Flow Depth (Feet)

N

Design Value Location

FIGURE 5

GRANITE HILL ROAD

100-YEAR FLOW DEPTH

2-yr

500-yr

100-yr 50-yr

25-yr

4715.5

4716.5

4717.5

4718.5

Water Surface Elevation (Feet)

N

Design Value Location

FIGURE 6

GRANITE HILL ROAD

100-YEAR WATER SURFACE

2-yr

500-yr

100-yr 50-yr

25-yr

Photos - Granite Hill Road Boundary Creek

PHOTO 1

PHOTO 2

PHOTO 3

9/24/2019

Low cover over pipe. Channel aligned relatively straight. Culvert backwatered.

Low cover over pipe. Channel aligned relatively straight.

Culvert outlet.

Boundary Creek confluence with Bull

Run Creek.

Placer mine tailings found between the creeks. Tailings excavation will occur from this point up Bull Run Creek 1300 feet. All tailings excavation will be above the vegetation line.

Culvert inlet.

PHOTO 4

PHOTO 5

PHOTO 6

9/24/2019

Beaver dam backwaters channel.

Culvert inlet.

Channel aligned relatively straight.

Culvert outlet.

Channel aligned relatively straight then bends sharply against placer mine tailings.

Boundary Creek downstream of culvert.

PHOTO 7

PHOTO 8

PHOTO 9

9/24/2019

Active channel width 5 feet. Banks stable. Riffle-run dominant bed form.

Cobble-gravel streambed material.

Boundary Creek downstream of culvert.

Placer mine tailings confine stream against road embankment. Tailing will be excavated for project material source. All excavation will be above the vegetation line.

Boundary Creek downstream of culvert.

Boundary Creek upstream of culvert.

Placer mine tailings confine stream against road embankment. Tailing will be excavated for project material source. All excavation will be above the vegetation line.

PHOTO 10

PHOTO 11

PHOTO 12

9/24/2019

Active channel width 5 feet. Banks stable. Riffle-run dominant bed form.

Cobble-gravel streambed material.

Boundary Creek upstream of culvert.

Bank erosion and channel migration occurs from woody debris deflecting stream flow towards banks.

Boundary Creek upstream of culvert.

Active channel width 5 feet. Banks stable. Riffle-run dominant bed form.

Cobble-gravel streambed material.

Boundary Creek downstream of culvert.

PHOTO 13

PHOTO 14

PHOTO 15

9/24/2019

Bull Run Creek at confluence with

Boundary Creek.

Channel location controlled by placer mine tailing. Active channel width 10 to

12 feet. Banks stable. Pool-riffle dominant bed form. Boulder-cobble-gravel streambed material. Tailings excavation will occur above vegetation line.

Bull Run Creek at outlet of new

Boundary Creek channel.

Channel location controlled by placer mine tailing. Active channel width 10 to

12 feet. Banks stable. Pool-riffle dominant bed form. Boulder-cobble-gravel streambed material. Tailings excavation will occur above vegetation line.

Bull Run Creek upstream of confluence with Boundary Creek.

Channel location controlled by placer mine tailing. Active channel width 10 to

12 feet. Banks stable. Pool-riffle dominant bed form. Boulder-cobble-gravel streambed material. Tailings excavation will occur above vegetation line.

AOP CULVERT & CHANNEL PROFILE

BOUNDARY CREEK

.4

Project: File:

Desc: By:

Region: 4 Date:

Exceed Eq:

Prob. K a b c d e

0.50 1.051 0.8723 -0.8984 2.381 2.169 -1.257 Source:

0.10 28.15 0.8509 -0.8835 1.857 1.981 -1.665

0.04 58.27 0.8445 -0.8857 1.699 2.043 -1.782

0.02 83.98 0.8407 -0.8904 1.610 2.117 -1.865

0.01 109.20 0.8375 -0.8971 1.538 2.205 -1.941 Culvert Type HW/D K M a

0.002 152.80 0.8316 -0.9183 1.416 2.449 -2.097 CMP Projecting 1.0 0.5 0.667 2.827

Mean Mean Estimated Discharge (Q) Min.

Drain. WS Jan Min Soil Exceedance Probability Culvert

Station Area Slope P Jan T Depth 0.50 0.10 0.04 0.02 0.01 0.002 Dia

(sq mi) (deg) (in) (deg F) (in) (cfs) (cfs) (cfs) (cfs) (cfs) (cfs) (ft)

7630 22.6 5.28 23.1 50.7 48.6 42.1 40.5 40.1 40.5 41.3 44.2

Minimum 1.7 5.35 1.37 16.4 21.3

7.52 11.3 3.14 18.8 41.3 57 105 138 161 184 241 6

14.50 12.9 3.18 18.6 41.2 91 164 215 249 283 367 7

23.70 13.4 3.27 18.7 39.8 152 272 355 411 467 604 8

30.30 13.5 3.31 18.7 40.2 190 335 435 502 569 733 9

4.41 17.2 3.54 18.4 33.2 41 79 105 123 141 186 5

0.2 11.0 3.20 18.8 33.2 3 7 10 12 14 20 2

0.6 11.0 3.2 18.8 33.2 9 18 25 30 35 48 3

0.9 11.0 3.2 18.8 33.2 13 27 36 43 51 69 3

1.2 11.0 3.2 18.8 33.2 17 35 47 56 66 89 4

1.6 11.0 3.2 18.8 33.2 20 42 57 68 80 109 4

1.9 11.0 3.2 18.8 33.2 24 50 67 80 94 127 4

2.5 11.0 3.20 18.8 33.2 31 63 85 101 118 160 5

Notes:

a = ((HW/D)/K)^(1/M) 1 No entry for Region 1

K = Constant from Table 9, HDS-5 https://pubs.usgs.gov/sir/2005/5116/pdf/sir2005-5116.pdf

M = Constant from Table 9, HDS-5

D = [Q/(0.7844x(1/K^1/M))]^.4 from HDS-5, equation 27. Assumes HW/D < 1.2 ,unsubmerged.

FLOOD DISCHARGE ESTIMATES

UNGAGED OREGON SITES

Boundary Creek

General Minor

Estimation of Peak Discharges for Rural, Unregulated Streams in Eastern Oregon

(Open File Report SW 06-001, 2006).

Maximum

Bull Run No. 1

Bull Run No. 2

Bull Run No. 3

Bull Run No. 4

OR GRANT 24(1) - Granite Hill Road Reconstruction reg-spec2019.xls

Culvert replacement analysis S. Leon

7/22/2019

Coefficients Q = KA^a (I24-2)^b (MxJan)^c (SoilC)^d

(SoilP)^e

Project: File:

Desc: By:

Region: 4 Date:

FLOOD DISCHARGE ESTIMATES

UNGAGED OREGON SITES

OR GRANT 24(1) - Granite Hill Road Reconstruction reg-spec2019.xls

Culvert replacement analysis S. Leon

7/22/2019

0.2 0.6 0.9 1.2 1.6 1.9 2.5

C u lv e rt

D ia m e te r (f t)

D is c h a rg e c fs

Drainage Area (sq. mile)

Q vs DA Dia. vs DA

7/22/2019 StreamStats https://streamstats.usgs.gov/ss/ 1/11

Boundary Creek - StreamStats Report

Basin Characteristics

Parameter Code Parameter Description Value Unit

ASPECT basin average of topographic slope compass directions from elevation grid

214 degrees

BSLOPD Mean basin slope measured in degrees 17.2 degrees

DRNAREA Area that drains to a point on a stream 4.41 square miles

DRNDENSITY Basin drainage density defined as total stream length divided by drainage area.

0.98 dimensionless

ELEV Mean Basin Elevation 6080 feet

ELEVMAX Maximum basin elevation 8300 feet

Region ID: OR Workspace ID: OR20190722195843133000 Clicked Point (Latitude, Longitude): 44.78749, -118.37464 Time: 2019-07-22 12:59:02 -0700 https://streamstats.usgs.gov/ss/ 2/11

Parameter Code Parameter Description Value Unit

FOREST Percentage of area covered by forest 76.5 percent

I24H2Y Maximum 24-hour precipitation that occurs on average once in 2 years - Equivalent to precipitation intensity index

1.21 inches

IMPERV Percentage of impervious area 0 percent

JANAVPRE2K Mean January Precipitation 3.54 inches

JANMAXT2K Mean Maximum January Temperature from 2K resolution PRISM 1961-1990 data

32.9 degrees F

JANMAXTMP Mean Maximum January Temperature 30.3 degrees F

JANMINT2K Mean Minimum January Temperature from 2K resolution PRISM PRISM 1961-1990 data

18.4 degrees F

JANMINTMP Mean Minimum January Temperature 15.4 degrees F

JULAVPRE2K Mean July Average Precipitation 1.03 inches

LC11BARE Percentage of barren from NLCD 2011 class 31 0 percent

LC11CRPHAY Percentage of cultivated crops and hay, classes 81 and 82, from NLCD 2011

0 percent

LC11DEVHI Percentage of area developed, high intensity, NLCD 2011 class 24

0 percent

LC11DVLO Percentage of developed area, low intensity, from NLCD 2011 class 22

0 percent

LC11DVMD Percentage of area developed, medium intensity, NLCD 2011 class 23

0 percent

LC11DVOPN Percentage of developed open area from NLCD 2011 class 21

0 percent

LC11FORSHB Percentage of forests and shrub lands, classes 41 to 52, from NLCD 2011

97 percent

LC11HERB Percentage of herbaceous from NLCD 2011 classes 71-74

3 percent

LC11IMP Average percentage of impervious area determined from NLCD 2011 impervious dataset

0.29 percent

LC11WATER Percent of open water, class 11, from NLCD 2011 0 percent

LC11WETLND Percentage of wetlands, classes 90 and 95, from

NLCD 2011

0 percent

MAJ_ROADS Length of non-state major roads in basin 0.00308 miles https://streamstats.usgs.gov/ss/ 3/11

Parameter Code Parameter Description Value Unit

MAXBSLOPD Maximum basin slope, in degrees, using ArcInfo Grid with NHDPlus 30-m resolution elevation data.

35.7 degrees

MAXTEMP Mean annual maximum air temperature over basin area from PRISM 1971-2000 800-m grid

49 degrees F

MINBELEV Minimum basin elevation 4720 feet

MINBSLOPD Minimum basin slope, in degrees, using ArcInfo Grid with NHDPlus 30-m resolution elevation data.

0.29 degrees

MINTEMP Mean annual minimum air temperature over basin surface area as defined in SIR 2008-5126

29.4 degrees F

MIN_ROADS Length of non-state minor roads in basin 17.9 miles

ORREG2 Oregon Region Number 363 dimensionless

OR_HIPERMA Percent basin surface area containing high permeability aquifer units as defined in SIR 2008-

0 percent

OR_HIPERMG Percent basin surface area containing high permeability geologic units as defined in SIR 2008-

0 percent

PRECIP Mean Annual Precipitation 30.2 inches

RELIEF Maximum - minimum elevation 3580 feet

SOILPERM Average Soil Permeability 1.08 inches per hour

STATE_HWY Length of state highways in basin 0 miles

STATSGODEP Area-weighted average soil depth from NRCS STATSGO database

33.2 inches

STRMTOT total length of all mapped streams (1:24,000-scale) in the basin

6.93 miles

WATCAPORC Available water capacity from STATSGO data using methods from SIR 2005-5116

0.12 inches

WATCAPORR Available water capacity from STATSGO data using methods from SIR 2008-5126

0.12 inch per inch

Monthly Flow Statistics Parameters[LowFlow Apr Region05 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit https://streamstats.usgs.gov/ss/ 4/11

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 4.41 square miles 4.713 7639.367

MINBELEV Minimum Basin Elevation 4720 feet 397.3291 4907.1948

PRECIP Mean Annual Precipitation 30.2 inches 14.4905 33.1354

Monthly Flow Statistics Parameters[LowFlow Aug Region05 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 4.41 square miles

7.042 7639.367

WATCAPORR Available_Water_Capacity_OR_Risley 0.12 inch per inch

0.104 0.166

SOILPERM Average Soil Permeability 1.08 inches per hour

0.712 2.528

ELEVMAX Maximum Basin Elevation 8300 feet 3612.0857 11187.3569

Monthly Flow Statistics Parameters[LowFlow Dec Region05 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 4.41 square miles

4.713 7639.367

OR_HIPERMG OR Percent HighPerm Geologic

0 percent 0 81.6986

PRECIP Mean Annual Precipitation 30.2 inches 13.7847 33.1354

BSLOPD Mean Basin Slope degrees 17.2 degrees 5.476 22.364

Monthly Flow Statistics Parameters[LowFlow Feb Region05 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 4.41 square miles 4.713 5138.995

MINTEMP Mean Annual Min Temperature 29.4 degrees F 27.767 38.326

PRECIP Mean Annual Precipitation 30.2 inches 13.7847 33.1354

Monthly Flow Statistics Parameters[LowFlow Jan Region05 2008 5126] https://streamstats.usgs.gov/ss/ 5/11

Parameter Code Parameter Name Value Units Min Limit Max LimitParameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 4.41 square miles 4.713 7639.367

PRECIP Mean Annual Precipitation 30.2 inches 13.7847 33.1354

BSLOPD Mean Basin Slope degrees 17.2 degrees 5.476 22.364

MAXBSLOPD Maximum Basin Slope in deg 35.7 degrees 32.502 67.454

Monthly Flow Statistics Parameters[LowFlow Jul Region05 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 4.41 square miles 7.042 7639.367

PRECIP Mean Annual Precipitation 30.2 inches 13.7847 33.1354

ELEVMAX Maximum Basin Elevation 8300 feet 3612.0857 11187.3569

Monthly Flow Statistics Parameters[LowFlow Jun Region05 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 4.41 square miles 4.713 7639.367

PRECIP Mean Annual Precipitation 30.2 inches 13.7847 33.1354

ELEVMAX Maximum Basin Elevation 8300 feet 3612.0857 11187.3569

Monthly Flow Statistics Parameters[LowFlow Mar Region05 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 4.41 square miles 7.042 7639.367

MINTEMP Mean Annual Min Temperature 29.4 degrees F 27.767 38.326

PRECIP Mean Annual Precipitation 30.2 inches 13.7847 33.1354

Monthly Flow Statistics Parameters[LowFlow May Region05 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 4.41 square miles 4.713 7639.367

PRECIP Mean Annual Precipitation 30.2 inches 13.7847 33.1354

ELEVMAX Maximum Basin Elevation 8300 feet 3612.0857 11187.3569

Monthly Flow Statistics Parameters[LowFlow Nov Region05 2008 5126] https://streamstats.usgs.gov/ss/ 6/11

Parameter Code Parameter Name Value Units Min Limit Max Limit Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 4.41 square miles

4.713 7639.367

MINBSLOPD Minimum Basin Slope in deg

0.29 degrees 0 0.331

PRECIP Mean Annual Precipitation 30.2 inches 13.7847 33.1354

ELEVMAX Maximum Basin Elevation 8300 feet 3788.7019 11187.3569

Monthly Flow Statistics Parameters[LowFlow Oct Region05 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 4.41 square miles 7.042 7639.367

PRECIP Mean Annual Precipitation 30.2 inches 13.7847 31.6882

ELEVMAX Maximum Basin Elevation 8300 feet 3612.0857 9041.5501

Monthly Flow Statistics Parameters[LowFlow Sep Region05 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 4.41 square miles 7.042 7639.367

PRECIP Mean Annual Precipitation 30.2 inches 13.7847 33.1354

ELEVMAX Maximum Basin Elevation 8300 feet 3788.7019 11187.3569

Monthly Flow Statistics Disclaimers[LowFlow Apr Region05 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report[LowFlow Apr Region05 2008 5126]

Statistic Value Unit

Apr 7 Day 2 Year Low Flow 4.15 ft^3/s

Apr 7 Day 10 Year Low Flow 1.6 ft^3/s

Monthly Flow Statistics Disclaimers[LowFlow Aug Region05 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report[LowFlow Aug Region05 2008 5126] https://streamstats.usgs.gov/ss/ 7/11

Statistic Value Unit

Aug 7 Day 2 Year Low Flow 0.773 ft^3/s

Aug 7 Day 10 Year Low Flow 0.413 ft^3/s

Monthly Flow Statistics Disclaimers[LowFlow Dec Region05 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report[LowFlow Dec Region05 2008 5126]

Statistic Value Unit

Dec 7 Day 2 Year Low Flow 1.22 ft^3/s

Dec 7 Day 10 Year Low Flow 0.319 ft^3/s

Monthly Flow Statistics Disclaimers[LowFlow Feb Region05 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report[LowFlow Feb Region05 2008 5126]

Statistic Value Unit

Feb 7 Day 2 Year Low Flow 1.44 ft^3/s

Feb 7 Day 10 Year Low Flow 0.454 ft^3/s

Monthly Flow Statistics Disclaimers[LowFlow Jan Region05 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report[LowFlow Jan Region05 2008 5126]

Statistic Value Unit

Jan 7 Day 2 Year Low Flow 1.05 ft^3/s

Jan 7 Day 10 Year Low Flow 0.253 ft^3/s

Monthly Flow Statistics Disclaimers[LowFlow Jul Region05 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors https://streamstats.usgs.gov/ss/ 8/11

Monthly Flow Statistics Flow Report[LowFlow Jul Region05 2008 5126]

Statistic Value Unit

Jul 7 Day 2 Year Low Flow 3.18 ft^3/s

Jul 7 Day 10 Year Low Flow 1.95 ft^3/s

Monthly Flow Statistics Disclaimers[LowFlow Jun Region05 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report[LowFlow Jun Region05 2008 5126]

Statistic Value Unit

Jun 7 Day 2 Year Low Flow 9.33 ft^3/s

Jun 7 Day 10 Year Low Flow 5.19 ft^3/s

Monthly Flow Statistics Disclaimers[LowFlow Mar Region05 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report[LowFlow Mar Region05 2008 5126]

Statistic Value Unit

Mar 7 Day 2 Year Low Flow 2.23 ft^3/s

Mar 7 Day 10 Year Low Flow 0.712 ft^3/s

Monthly Flow Statistics Disclaimers[LowFlow May Region05 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report[LowFlow May Region05 2008 5126]

Statistic Value Unit

May 7 Day 2 Year Low Flow 8.56 ft^3/s

May 7 Day 10 Year Low Flow 3.35 ft^3/s

Monthly Flow Statistics Disclaimers[LowFlow Nov Region05 2008 5126] https://streamstats.usgs.gov/ss/ 9/11

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report[LowFlow Nov Region05 2008 5126]

Statistic Value Unit

Nov 7 Day 2 Year Low Flow 6.51 ft^3/s

Nov 7 Day 10 Year Low Flow 9.48 ft^3/s

Monthly Flow Statistics Disclaimers[LowFlow Oct Region05 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report[LowFlow Oct Region05 2008 5126]

Statistic Value Unit

Oct 7 Day 2 Year Low Flow 1.18 ft^3/s

Oct 7 Day 10 Year Low Flow 0.647 ft^3/s

Monthly Flow Statistics Disclaimers[LowFlow Sep Region05 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Monthly Flow Statistics Flow Report[LowFlow Sep Region05 2008 5126]

Statistic Value Unit

Sep 7 Day 2 Year Low Flow 1.35 ft^3/s

Sep 7 Day 10 Year Low Flow 0.831 ft^3/s

Monthly Flow Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

Flow-Duration Statistics Parameters[LowFlow Ann Region05 2008 5126]

Parameter Code Parameter Name Value Units Min Limit Max Limit http://pubs.usgs.gov/sir/2008/5126/ https://streamstats.usgs.gov/ss/ 10/11

Parameter Code Parameter Name Value Units Min Limit Max Limit

DRNAREA Drainage Area 4.41 square miles 7.042 7639.367

PRECIP Mean Annual Precipitation 30.2 inches 14.4905 33.1354

ELEVMAX Maximum Basin Elevation 8300 feet 3612.0857 11187.3569

Flow-Duration Statistics Disclaimers[LowFlow Ann Region05 2008 5126]

One or more of the parameters is outside the suggested range. Estimates were extrapolated with unknown errors

Flow-Duration Statistics Flow Report[LowFlow Ann Region05 2008 5126]

Statistic Value Unit

5 Percent Duration 19.4 ft^3/s

10 Percent Duration 12.8 ft^3/s

25 Percent Duration 4.81 ft^3/s

50 Percent Duration 2.35 ft^3/s

95 Percent Duration 0.851 ft^3/s

Flow-Duration Statistics Citations

Risley, John, Stonewall, Adam, and Haluska, Tana,2008, Estimating flow-duration and low-flow frequency statistics for unregulated streams in Oregon: U.S. Geological Survey Scientific Investigations Report 2008-5126, 22 p. (http://pubs.usgs.gov/sir/2008/5126/)

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http://pubs.usgs.gov/sir/2008/5126/ https://streamstats.usgs.gov/ss/ 11/11

Application Version: 4.3.8