Fish Passage Site 20603481

Coordinates (dec. deg.): 61.19243°, -151.02775°
Legal Description: S013N010W26
Region: South Central
Road Name: Beluga Highway

Datum: NAD83
Quad Name / ITM: Tyonek A-3
AWC Stream #:
Stream Name: Unnamed


Site Comments: Creek is a tributary to AWC Stream 247-30-10120 "Powerhouse Creek"

Survey Date: Apr 28, 2016


Project Supervisor: Gillian O'Doherty, ADFG
Observers: Mark Eisenman, Robert Pype

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

  1. Beaver Activity
  2. Outfall height gray
  3. Culvert gradient red

Comments: Water very ferric. Large beaver dam about 50 feet upstream from inlet. Outlet perched and sits right on top of gas pipeline. Satellite imagery shows about .1 mile of habitat above beaver dam.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated aluminum) Fish Passage Rating: Red
Length(ft): 41.8
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.6
Corrugation Width(in.): 1.5
Condition Rating(1-5): 2
Approach Angle: 0.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
Width(ft):3.6 3.65
Height(ft):3.6 3.67
Apron Length(ft):
Water Depth(ft): 0.12
Rustline Height(ft):0.8
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.35
Outfall Type: Free Fall In To Pool
Constriction Ratio:
Culvert Gradient: 4.09%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Beaver Activity
  2. Outfall height gray
  3. Culvert gradient red

Stream Measurements

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

No stream width data available.


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Road Elev 104.44
D/S Tailcrest or 1st Thalweg 0.00 95.84
D/S Water Surface Elev 0.00 96.05
Max Pool Depth 18.00 92.63
Outlet Pool Water Elev 18.00 96.05
Outlet Invert (On pipe) 33.00 96.28
D/S Water Surface Elev 33.00 96.40
Outlet Culvert Top 33.00 100.00
Inlet Culvert Invert (On pipe) 74.80 97.99
U/S Water Surface Elev 74.80 98.17
Inlet Culvert Top 74.80 101.36
U/S Grade Ctrl (Thalweg) (1st resting) 81.80 98.42
U/S Water Surface Elev 81.80 98.55
U/S Grade Ctrl (Thalweg) (Top of beaver dam) 128.80 105.15
U/S Water Surface Elev (Beaver pond water surface) 128.80 104.90


  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): 20.0
Comments: Trap set about 50 feet downstream of outlet

Fish Observations

Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 2 Fish Measured: 2 Fork Lengths (mm) Min: 74 Max: 75 Mean: 74
Collected/Observed by Gear Type: Downstream Minnow Trap (2)  

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