Fish Passage Site 20503426

Coordinates (dec. deg.): 61.72961°, -150.02692°
Legal Description: S019N004W17
Region: South Central
Road Name: Alaska Railroad

Datum: NAD83
Quad Name / ITM: Tyonek C-1
AWC Stream #:
Stream Name: Jack Lake Inlet


Site Comments: MP 184.51

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. Culvert gradient red

Comments: None

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
Length(ft): 46.7
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.5
Condition Rating(1-5): 2
Approach Angle: 90.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: None
Width(ft):4.0 4.0
Height(ft):4.0 4.0
Apron Length(ft):
Water Depth(ft): 1.2
Rustline Height(ft):1.5
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 1.13%
Max Slope:
Max Slope Length:

Comments: Culvert is completely rusted. Rustline taken at what loos like most prominent line. Looks like old beaver influence upstream. Small hydrolic jump at inlet. Culvert likely undersized. Culvert has a small piece of offset pipe about 1 foot in length creating a small miter.

  Culvert Observations:
  1. 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)
Outlet Invert (on pipe) 0.00 91.72
Outlet Culvert Top 1.00 95.73
Inlet Culvert Top 45.70 96.31
Inlet Culvert Invert (on pipe) 46.70 92.25


  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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