Fish Passage Site 20100715

Coordinates (dec. deg.): 61.81702°, -145.21522°
Legal Description: C001S001E03
Region: South Central
Road Name: Richardson Highway

Datum: NAD83
Quad Name / ITM: Valdez D-4
AWC Stream #:
Stream Name: Willow Creek


Site Comments: None

Multiple surveys have been conducted at this site — click on the drop down
arrow to the right of the survey date below to choose a different report for this site.


Project Supervisor: Gillian O'Doherty, ADFG
Observers: Kirsti Jurica

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

  1. Sediment accumulation

Comments: This assessment was conducted by the Copper River Watershed Project. Arctic Grayling caught up and downstream from culvert.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Green
Length(ft): 202.9
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 4
Approach Angle: 15.0
Sedimentation At Inlet: Yes
Inlet Substrate: Cobble
Outlet Substrate: Silt/Clay
Width(ft):16.4 16.15
Height(ft):9.06 9.52
Apron Length(ft):
Water Depth(ft): 1.08
Rustline Height(ft):2.5
Substrate Depth(ft):0.2 0.87
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.03
Culvert Gradient: 0.10%
Max Slope:
Max Slope Length:

Comments: Large sediement wedge at outlet. Substrate gradient though culvert .3%

  Culvert Observations:
  1. Sediment accumulation

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):0.02
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Width (ft)
Downstream ordinary high water 13.50
Downstream ordinary high water 9.20
Downstream ordinary high water 13.80
Upstream ordinary high water 20.20
Upstream ordinary high water 14.20
Upstream ordinary high water 15.30
Upstream ordinary high water 14.80


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Road Elev 102.36
D/S Grade Ctrl (Thalweg) 0.00 85.25
D/S Water Surface Elev 0.00 88.31
D/S Tailcrest or 1st Thalweg (Tailwater control top of V) 66.00 88.06
D/S Water Surface Elev 66.00 88.71
D/S Thalweg (downstream riffle) 68.00 87.73
D/S Water Surface Elev 68.00 88.71
Outlet Invert 79.40 87.80
D/S Water Surface Elev 79.40 88.88
Outlet Culvert Top 94.00 97.32
D/S Thalweg (Below top of culvert) 94.00 87.87
D/S Water Surface Elev 94.00 88.97
U/S Thalweg (Below top of culvert) 266.80 88.66
U/S Water Surface Elev 266.80 89.16
Inlet Culvert Top 266.80 97.53
U/S Thalweg (Mid miter) 272.80 88.81
U/S Water Surface Elev 272.80 89.46
Inlet Culvert Invert 282.40 88.80
U/S Water Surface Elev 282.40 89.82
U/S Grade Ctrl (Thalweg) 300.80 88.32
U/S Water Surface Elev 300.80 89.84
U/S Grade Ctrl (Thalweg) 416.80 88.24
U/S Water Surface Elev 416.80 89.86


  1. River distance is measured continuously throughout the survey reach along the thalweg of the stream.
  2. Measured from each end of the crossing along the thalweg of the stream.

Fish Sampling Efforts

Gear Type: Minnow Trap (A) Trap Duration(h): 18.0
Comments: 2 Traps set upstream.
Gear Type: Minnow Trap (B) Trap Duration(h): 18.0
Comments: 2 traps set downstream

Fish Observations

Species: juvenile Arctic grayling Life History: Resident
Total Fish Observed: 5 Fish Measured: 5 Fork Lengths (mm) Min: 80 Max: 95 Mean: 86
Collected/Observed by Gear Type: Downstream Minnow Trap (3)  Upstream Minnow Trap (2)  

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