Fish Passage Site 20100702

Coordinates (dec. deg.): 61.53021°, -145.23548°
Legal Description: C004S001E09
Region: South Central
Road Name: Richardson Highway

Datum: NAD83
Quad Name / ITM: Valdez C-4
AWC Stream #:
Stream Name: Little Tosina Tributary


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 red
  2. Culvert gradient red
  3. Culvert is poorly aligned

Comments: This assessment was conducted by the Copper River Watershed Project. Juvenile Dolly Varden caught upstream and downstream. Juvenile Coho caught downstream,

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
Length(ft): 98.7
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.75
Corrugation Width(in.): 2.75
Condition Rating(1-5): 3
Approach Angle: 30.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
Width(ft):3.8 3.95
Height(ft):3.94 4.07
Apron Length(ft):
Water Depth(ft): 0.24
Rustline Height(ft):1.5
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.73
Outfall Type: Free Fall In To Pool
Constriction Ratio: 0.85
Culvert Gradient: 2.20%
Max Slope:
Max Slope Length:

Comments: Slight inlet damage. Stream gradient is about 1% upstream and 2% downstream.

  Culvert Observations:
  1. Outfall height red
  2. Culvert gradient red
  3. Culvert is poorly aligned

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):1
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Width (ft)
Downstream ordinary high water 6.20
Downstream ordinary high water 4.30
Downstream ordinary high water 2.10
Upstream ordinary high water 4.90
Upstream ordinary high water 5.20
Upstream ordinary high water 3.20


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Road Elev 103.54
D/S Grade Ctrl (Thalweg) 0.00 83.66
D/S Water Surface Elev 0.00 84.45
D/S Grade Ctrl (Thalweg) 16.00 84.62
D/S Water Surface Elev 16.00 85.02
D/S Grade Ctrl (Thalweg) 55.00 85.30
D/S Water Surface Elev 55.00 85.73
Max Pool Depth (2nd downstream pool) 63.00 84.17
D/S Water Surface Elev 63.00 85.84
D/S Tailcrest or 1st Thalweg 71.00 85.52
D/S Water Surface Elev 71.00 85.85
Max Pool Depth 82.00 84.33
Outlet Pool Water Elev 82.00 85.91
Outlet Culvert Top 85.00 90.47
Outlet Invert 85.00 86.40
D/S Water Surface Elev 85.00 86.64
Inlet Culvert Invert 184.00 88.71
U/S Water Surface Elev 184.00 89.26
Inlet Culvert Top 184.00 92.65
U/S Grade Ctrl (Thalweg) 192.00 89.05
U/S Water Surface Elev 192.00 89.45
U/S Grade Ctrl (Thalweg) 203.00 87.59
U/S Water Surface Elev 203.00 89.59
U/S Grade Ctrl (Thalweg) 215.00 88.86
U/S Water Surface Elev 215.00 89.71
U/S Grade Ctrl (Thalweg) 290.00 89.55
U/S Water Surface Elev 290.00 90.37


  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.
Gear Type: Minnow Trap (B) Trap Duration(h): 18.0
Comments: 3 traps set downstream.

Fish Observations

Species: Dolly Varden Life History: Unknown
Total Fish Observed: 7 Fish Measured: 7 Fork Lengths (mm) Min: 85 Max: 120 Mean: 99
Collected/Observed by Gear Type: Downstream Minnow Trap (3)  Upstream Minnow Trap (4)  
Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 1 Fish Measured: 1 Fork Lengths (mm) Min: 80 Max: 80 Mean: 80
Collected/Observed by Gear Type: Downstream Minnow Trap (1)  

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