Fish Passage Site 20100714

Coordinates (dec. deg.): 61.79327°, -145.18979°
Legal Description: C001S001E11
Region: South Central
Road Name: Richardson Highway

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


Site Comments: Milepost 88.8

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: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

  1. Culvert gradient red
  2. Woody Debris
  3. Culvert sagging in middle
  4. Outfall height red

Comments: This assessment was conducted by the Copper River Watershed Project.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
Length(ft): 115.1
Inlet Type: Projecting
Outlet Type: Mitered
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.625
Condition Rating(1-5): 3
Approach Angle:
Sedimentation At Inlet: Yes
Inlet Substrate: Silt/Clay
Outlet Substrate: Organic
Width(ft):3.8 3.8
Height(ft):2.8 4.03
Apron Length(ft):
Water Depth(ft): 0.18
Rustline Height(ft):0.3
Substrate Depth(ft):1.1 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 1.09
Outfall Type: Cascade Over Rip-Rap
Constriction Ratio: 0.95
Culvert Gradient: 1.70%
Max Slope:
Max Slope Length:

Comments: There is no sediment at outlet but there is a large debris jam at the end of the culvert miter that is about 1.19 feet deep. Outfall is a casacade over debris jam. Substrate gradient is 2.7%. Stream slope calculated with clinometer.

  Culvert Observations:
  1. Culvert gradient red
  2. Outfall height gray
  3. Woody Debris
  4. Culvert sagging in middle

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):1.4
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Width (ft)
Downstream ordinary high water 4.10
Downstream ordinary high water 3.70
Downstream ordinary high water 4.20


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Road Elev 100.00
D/S Grade Ctrl (Thalweg) 0.00 80.56
D/S Water Surface Elev 0.00 81.36
D/S Grade Ctrl (Thalweg) 34.00 81.58
D/S Water Surface Elev 34.00 82.17
D/S Grade Ctrl (Thalweg) 68.00 81.38
D/S Water Surface Elev 68.00 82.32
D/S Thalweg (Outlet Riffle) 84.00 81.97
D/S Water Surface Elev 84.00 82.49
Outlet Invert 88.00 82.47
D/S Water Surface Elev 88.00 82.65
D/S Grade Ctrl (Thalweg) (Top of debris jam) 90.00 83.21
D/S Water Surface Elev 90.00 83.58
Outlet Culvert Top 99.00 86.50
D/S Thalweg (directly below top of culvert) 99.00 82.40
D/S Water Surface Elev 99.00 83.84
Inlet Culvert Invert (On substrate) 203.00 85.62
U/S Water Surface Elev 203.00 85.92
Inlet Culvert Top 203.00 88.50
U/S Grade Ctrl (Thalweg) 208.00 85.14
U/S Water Surface Elev 208.00 86.10
U/S Grade Ctrl (Thalweg) 218.00 84.03
U/S Water Surface Elev 218.00 86.12


  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: 3 traps set upstream, no fish caught or observed.
Gear Type: Minnow Trap (B) Trap Duration(h): 18.0
Comments: 2 traps set downstream, no fish caught or observed.

Fish Observations

No fish observations occurred during this survey.

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