Fish Passage Site 20503429

Coordinates (dec. deg.): 61.82552°, -150.06401°
Legal Description: S020N004W18
Region: South Central
Road Name: Alaska Railroad

Datum: NAD83
Quad Name / ITM: Tyonek D-1
AWC Stream #:
Stream Name: Unnamed Tributary to Little Willow Creek


Site Comments: MP 191.4

Survey Date: May 11, 2015


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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

  1. Beaver Activity

Comments: Beaver dam about 100 feet upstream from inlet, habitat looks marginal with lots of algae and red flocculant in the water.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
Length(ft): 52.4
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5): 2
Approach Angle: 0.0
Sedimentation At Inlet: No
Inlet Substrate: Sand
Outlet Substrate: Organic
Width(ft):4.9 4.8
Height(ft):3.5 4.6
Apron Length(ft):
Water Depth(ft):
Rustline Height(ft):2.3
Substrate Depth(ft):1.5 0.3
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: -0.44%
Max Slope:
Max Slope Length:

Comments: Inlet is CSP, outlet Corrugated Aluminum end added, about 10 feet in length. Large beaved dam inside barrel of culvert about 3/4 of the way down the barrel. Outlet damage

  Culvert Observations:
  1. Beaver Activity

Stream Measurements

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

No stream width data available.


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Outlet Invert 0.00 90.48
Outlet Culvert Top 0.00 95.12
Inlet Culvert Invert 52.40 91.39
Inlet Culvert Top 52.40 94.89


  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

No fish sampling occurred during this survey.

Fish Observations

No fish observations occurred during this survey.

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