Fish Passage Site 20501514

Coordinates (dec. deg.): 62.01782°, -149.94847°
Legal Description: S022N004W11
Region: South Central
Road Name: Shaman Road

Datum: WGS84
Quad Name / ITM: Talkeetna Mts A-6
AWC Stream #: 247-41-10200-2190-3020
Stream Name: Caswell Creek


Site Comments: Water in this creek flows all winter.

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.

Survey UPD20-SHA01

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: Gillian O'Doherty, Kim Clark, Michael Mazzacavallo

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2018

Comments: Resurvey of Fish Passage project. Landowner said he saw 50+ adults Coho up above culvert and smolt are overwintering on his property above a beaver dam.

Culvert Measurements

ID: 1 Structure Type: Box culvert (Structural aluminum plate) Fish Passage Rating: Green
Length(ft): 69.97
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.25
Corrugation Width(in.): 9.0
Condition Rating(1-5): 5
Approach Angle:
Sedimentation At Inlet: No
Inlet Substrate: Cobble
Outlet Substrate: Gravel
Width(ft):15.0 13.0
Height(ft):5.5 5.1
Apron Length(ft):
Water Depth(ft): 0.91
Rustline Height(ft):
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 2.5
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 2.14
Culvert Gradient: 2.09%
Max Slope:
Max Slope Length:

Comments: Water depth in culvert 1/2 of adjacent stream. Per the designs BFW is 14-15' and the Low flow channel is 7' wide. OHM is from old survey at 10.4 ft.

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)
D/S Thalweg (on riffle) 0.00 90.83
D/S Water Surface Elev 0.00 91.97
D/S Water Surface Elev 18.00 92.29
Outlet Invert (on substrate) 18.00 91.38
Outlet Culvert Top (on Rib) 18.00 97.08
Inlet Culvert Top 67.97 98.50
Inlet Culvert Invert 67.97 92.63
U/S Water Surface Elev 67.97 93.72
U/S Water Surface Elev 79.97 93.70
U/S Thalweg 79.97 92.56


  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

No fish sampling occurred during this survey.

Fish Observations

No fish observations occurred during this survey.

Questions or comments about this report can be directed to