Fish Passage Site 20100770

Coordinates (dec. deg.): 62.65892°, -144.47870°
Legal Description: C010N005E09
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: 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: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

  1. Outfall height gray
  2. Constriction ratio gray
  3. Culvert gradient red

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

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
Length(ft): 89.3
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.75
Corrugation Width(in.): 2.75
Condition Rating(1-5): 3
Approach Angle: 10.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: None
Width(ft):2.05 2.25
Height(ft):2.03 2.05
Apron Length(ft):
Water Depth(ft): 0.4
Rustline Height(ft):0.96
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.17
Outfall Type: Hydraulic Jump
Constriction Ratio: 0.69
Culvert Gradient: 2.75%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient red
  2. Outfall height gray
  3. Constriction ratio gray

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):4
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Width (ft)
Downstream ordinary high water 5.10
Downstream ordinary high water 3.60
Downstream ordinary high water 2.80
Upstream ordinary high water 4.20
Upstream ordinary high water 2.10
Upstream ordinary high water 2.60


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Road Elev 114.15
D/S Thalweg (Bottom of head cut) 0.00 88.97
D/S Water Surface Elev 0.00 92.42
D/S Grade Ctrl (Thalweg) (Top of head cut) 4.00 95.00
D/S Water Surface Elev 4.00 95.35
D/S Grade Ctrl (Thalweg) 40.00 96.76
D/S Water Surface Elev 40.00 97.36
D/S Tailcrest or 1st Thalweg 61.00 97.87
D/S Water Surface Elev 61.00 98.16
Max Pool Depth 70.60 96.34
Outlet Pool Water Elev 70.60 98.18
Outlet Culvert Top 75.20 100.00
Outlet Invert 75.20 97.95
D/S Water Surface Elev 75.20 98.35
Inlet Culvert Invert (On pipe) 164.50 100.41
U/S Water Surface Elev 164.50 101.06
Inlet Culvert Top 164.50 102.44
U/S Grade Ctrl (Thalweg) 168.50 100.68
U/S Water Surface Elev 168.50 101.18
U/S Grade Ctrl (Thalweg) 175.00 101.40
U/S Water Surface Elev 175.00 101.90
U/S Grade Ctrl (Thalweg) 181.50 101.82
U/S Water Surface Elev 181.50 102.53
U/S Grade Ctrl (Thalweg) 195.00 101.54
U/S Water Surface Elev 195.00 102.60


  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, no fish caught or recorded
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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