Fish Passage Site 20100718

Coordinates (dec. deg.): 61.99013°, -145.35716°
Legal Description: C002N001W02
Region: South Central
Road Name: Richardson Highway

Datum: NAD83
Quad Name / ITM: Valdez D-4
AWC Stream #:
Stream Name: Yetna Creek


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: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

  1. Culvert is poorly aligned

Comments: This assessment was performed by the Copper River Watershed Project. Large rip rap rocks at inlet and outlet

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Structural steel plate) Fish Passage Rating: Green
Length(ft): 121.5
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 3
Approach Angle: 35.0
Sedimentation At Inlet: No
Inlet Substrate: Sand
Outlet Substrate: Sand
Width(ft):5.85 5.85
Height(ft):5.88 5.78
Apron Length(ft):
Water Depth(ft): 1.21
Rustline Height(ft):1.75
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.17
Culvert Gradient: 0.98%
Max Slope:
Max Slope Length:

Comments: Rip rap at outlet causes an outlet riffle, but also looks like it hold back water through most of the culvert. Rip rap at inlet causing an a small hydralic jump in the miter. Stream slope taken with clinometer.

  Culvert Observations:
  1. Culvert is poorly aligned

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):0.5
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Width (ft)
Downstream ordinary high water 5.50
Downstream ordinary high water 7.20
Downstream ordinary high water 5.60
Upstream ordinary high water 5.10
Upstream ordinary high water 5.00
Upstream ordinary high water 4.70
Upstream ordinary high water 5.20


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Road Elev 107.78
D/S Grade Ctrl (Thalweg) 0.00 86.14
D/S Water Surface Elev 0.00 87.33
D/S Tailcrest or 1st Thalweg 99.00 88.38
D/S Water Surface Elev 99.00 88.88
Max Pool Depth 122.70 86.76
Outlet Pool Water Elev 122.70 88.92
Outlet Invert 126.60 87.73
D/S Water Surface Elev 126.60 88.94
Outlet Culvert Top 135.20 93.50
D/S Thalweg (below top of culvert) 135.20 87.72
D/S Water Surface Elev 135.20 89.04
U/S Thalweg (below top of culvert) 240.00 88.49
U/S Water Surface Elev 240.00 89.19
Inlet Culvert Top 240.00 94.37
Inlet Culvert Invert 248.60 88.92
U/S Water Surface Elev 248.60 89.59
U/S Grade Ctrl (Thalweg) 252.00 89.36
U/S Water Surface Elev 252.00 89.88
U/S Grade Ctrl (Thalweg) 272.00 89.99
U/S Water Surface Elev 272.00 90.84
U/S Grade Ctrl (Thalweg) 323.00 88.56
U/S Water Surface Elev 323.00 90.88
U/S Grade Ctrl (Thalweg) 431.00 90.97
U/S Water Surface Elev 431.00 91.56


  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): 19.0
Comments: 3 traps set upstream, no fish caught or observed
Gear Type: Minnow Trap (B) Trap Duration(h): 19.0
Comments: 3 traps set downstream, no fish caught or observed

Fish Observations

No fish observations occurred during this survey.

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