Fish Passage Site 20101835

Coordinates (dec. deg.): 61.45465°, -143.75995°
Legal Description: C005S009E11
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; Tributary 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: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2012

Site Observations:

  1. Culvert gradient red
  2. Improper bedding
  3. Inlet perch

Comments: This crossing was replaced in 2012 and has been resurveyed by the Copper River Watershed Project . Photos provided by the Copper River Watershed Project. Site resurveyed 9/12/14.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
Length(ft): 49.85
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.75
Condition Rating(1-5): 4
Approach Angle: 30.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: Gravel
Width(ft):4.06 4.1
Height(ft):4.06 3.84
Apron Length(ft):
Water Depth(ft): 1.06
Rustline Height(ft):
Substrate Depth(ft):0.0 0.15
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type: At Stream Grade
Constriction Ratio: 1.9
Culvert Gradient: 3.61%
Max Slope:
Max Slope Length:

Comments: Stream gradient taken with clinometer.

  Culvert Observations:
  1. Culvert gradient red
  2. Improper bedding
  3. Inlet perch

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 100.12
D/S Grade Ctrl (Thalweg) 0.00 90.37
D/S Water Surface Elev 0.00 92.02
D/S Tailcrest or 1st Thalweg 28.55 92.36
D/S Water Surface Elev 28.55 93.12
Max Pool Depth 31.50 92.22
Outlet Pool Water Elev 31.50 93.16
Outlet Invert 34.50 92.11
Outlet Culvert Top 34.50 95.95
D/S Water Surface Elev 34.50 93.17
Inlet Culvert Top 84.35 97.75
Inlet Culvert Invert 84.35 93.69
U/S Water Surface Elev 84.35 94.22
U/S Grade Ctrl (Thalweg) 90.55 94.31
U/S Water Surface Elev 90.55 94.63
U/S Grade Ctrl (Thalweg) 98.75 94.86
U/S Water Surface Elev 98.75 95.38
U/S Grade Ctrl (Thalweg) 113.55 95.15
U/S Water Surface Elev 113.55 95.73
U/S Grade Ctrl (Thalweg) 173.05 96.77
U/S Water Surface Elev 173.05 98.59


  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)
Comments: No fish caught
Gear Type: Minnow Trap (B)
Comments: No fish caught
Gear Type: Minnow Trap (C)
Gear Type: Minnow Trap (D)
Comments: No fish caught or observed.

Fish Observations

Species: juvenile Dolly Varden Life History:
Total Fish Observed: 1 Fish Measured: 1 Fork Lengths (mm) Min: 100 Max: 100 Mean: 100
Collected/Observed by Gear Type: Downstream Minnow Trap (1)  

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