Fish Passage Site 20103491

Coordinates (dec. deg.): 62.71182°, -144.32748°
Legal Description: C011N006E29
Region: South Central
Road Name: Tok Cut-off

Datum: NAD83
Quad Name / ITM: Gulkana C-1
AWC Stream #:
Stream Name: Copper River Tributary, Unnamed


Site Comments: MP 48.5

Survey Date: Sep 21, 2015


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. Outfall height red
  3. Inlet perch

Comments: Assessment conducted and submitted by the Copper River Watershed Project. Stream becomes very narrow with many hydraulic jumps about 250 feet upstream.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
Length(ft): 224.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.5
Condition Rating(1-5): 4
Approach Angle: 30.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: None
Width(ft):5.75 4.9
Height(ft):5.24 5.35
Apron Length(ft):
Water Depth(ft): 0.2
Rustline Height(ft):0.36
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 2.88
Outfall Type: Cascade Over Rip-Rap
Constriction Ratio: 2.3
Culvert Gradient: 7.59%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient red
  2. Outfall height red
  3. Inlet perch

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):6
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Width (ft)
Downstream ordinary high water 3.30
Downstream ordinary high water 3.50
Downstream ordinary high water 3.10
Upstream ordinary high water 3.10
Upstream ordinary high water 3.30
Upstream ordinary high water 1.20


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Road Elev 131.97
D/S Thalweg (bottom of head cut) 0.00 63.07
D/S Water Surface Elev 0.00 65.07
D/S Thalweg (top of head cut) 2.00 66.42
D/S Water Surface Elev 2.00 66.85
D/S Grade Ctrl (Thalweg) 31.00 66.12
D/S Water Surface Elev 31.00 66.92
Max Pool Depth 45.00 67.23
D/S Water Surface Elev 45.00 67.94
D/S Thalweg (rip rap pool) 68.00 71.43
D/S Water Surface Elev 68.00 72.30
Max Pool Depth 77.00 74.33
Outlet Pool Water Elev 77.00 75.03
Outlet Culvert Top 81.00 83.06
D/S Water Surface Elev 81.00 77.91
Outlet Invert 81.00 77.71
Inlet Culvert Invert 305.50 94.76
U/S Water Surface Elev 305.50 95.01
Inlet Culvert Top 305.50 100.00
U/S Thalweg (pool) 308.80 93.94
U/S Water Surface Elev 308.80 95.84
U/S Grade Ctrl (Thalweg) 317.50 95.88
U/S Water Surface Elev 317.50 96.13
U/S Grade Ctrl (Thalweg) 335.50 96.32
U/S Water Surface Elev 335.50 96.70
U/S Grade Ctrl (Thalweg) 379.50 99.68
U/S Water Surface Elev 379.50 100.19


  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 upstrea. 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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