Fish Passage Site 20503431

Coordinates (dec. deg.): 61.64993°, -149.91084°
Legal Description: S018N004W13
Region: South Central
Road Name: Alaska Railroad

Datum: NAD83
Quad Name / ITM: Anchorage C-8
AWC Stream #:
Stream Name: Unnamed


Site Comments: MP 177.5

Survey Date: May 12, 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
  2. Compound gradient in pipe

Comments: Upstream channel destroyed by off-road traffic. Upstream width about 2.5 feet

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.): 2.75
Condition Rating(1-5): 2
Approach Angle:
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: None
Width(ft):4.2 4.2
Height(ft):3.6 3.6
Apron Length(ft):
Water Depth(ft): 0.3
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 1.97%
Max Slope:
Max Slope Length:

Comments: Small section of culvert off set along bottom to create a small miter

  Culvert Observations:
  1. Culvert gradient red
  2. Compound gradient in pipe

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 Culvert Top 0.00 94.19
Outlet Invert (On pipe) 0.00 90.36
Inlet Culvert Top 44.80 94.90
Inlet Culvert Invert (On pipe) 46.10 91.28


  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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