Fish Passage Site 20101836

Coordinates (dec. deg.): 61.45503°, -143.76056°
Legal Description: C005S009E10
Region: South Central
Road Name: McCarthy Road

Datum: NAD83
Quad Name / ITM: Mc Carthy B-8
AWC Stream #:
Stream Name: Chokosna River tributary


Site Comments: Mile 27 McCarthy Rd; Trib to Chokosna River

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: Gillian O'Doherty

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2012

Site Observations:

  1. Culvert gradient gray

Comments: This crossing was replaced in 2012 and has been resurveyed by the Copper River Watershed Project on 9/12/14. . Photos provided by the Copper River Watershed Project. Dolly varden caught upstream and downstream of crossing

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Corrugated steel) Fish Passage Rating: Green
Length(ft): 48.1
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5): 5
Approach Angle: 40.0
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: Gravel
Width(ft):7.25 7.1
Height(ft):4.04 3.77
Apron Length(ft):
Water Depth(ft): 1.14
Rustline Height(ft):
Substrate Depth(ft):0.46 0.75
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.87
Culvert Gradient: 2.00%
Max Slope:
Max Slope Length:

Comments: Stream gradient taken with clinometer.

  Culvert Observations:
  1. Culvert gradient gray

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):2.5
Stream Flow Stage:Medium

No stream width data available.


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Road Elev 99.98
D/S Grade Ctrl (Thalweg) 0.00 93.14
D/S Water Surface Elev 0.00 94.17
D/S Tailcrest or 1st Thalweg 41.70 93.53
D/S Water Surface Elev 41.70 94.54
Max Pool Depth 49.30 93.41
Outlet Pool Water Elev 49.30 94.60
Outlet Invert (on substrate) 59.90 93.52
D/S Water Surface Elev 59.90 94.66
Outlet Culvert Top 59.90 97.29
Inlet Culvert Top 108.00 98.25
Inlet Culvert Invert (on substrate) 108.00 94.21
U/S Water Surface Elev 108.00 94.91
U/S Grade Ctrl (Thalweg) 115.50 94.23
U/S Water Surface Elev 115.50 95.68
U/S Grade Ctrl (Thalweg) 127.20 94.90
U/S Water Surface Elev 127.20 96.54
U/S Grade Ctrl (Thalweg) 175.10 95.08
U/S Water Surface Elev 175.10 96.84


  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)
Gear Type: Minnow Trap (B)
Comments: No fish caught
Gear Type: Minnow Trap (C)
Gear Type: Minnow Trap (D)
Comments: No fish caught
Gear Type: Minnow Trap (E)

Fish Observations

Species: juvenile Dolly Varden Life History:
Total Fish Observed: 4 Fish Measured: 4 Fork Lengths (mm) Min: 85 Max: 105 Mean: 97
Collected/Observed by Gear Type: Downstream Minnow Trap (1)  Upstream Minnow Trap (2)  Upstream Minnow Trap (1)  

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