Fish Passage Site 20303515

Coordinates (dec. deg.): 60.97443°, -149.09525°
Legal Description: S010N002E09
Region: South Central
Road Name: Arlberg Avenue

Datum: NAD83
Quad Name / ITM: Seward D-6
AWC Stream #: 247-60-10250-2018-3132
Stream Name: Unnamed


Site Comments: None

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 UPD21-ALB02

Project Supervisor: Kim Clark, ADFG — Anchorage, AK
Observers: Kim Clark, Michael Mazzacavallo

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2016

Comments: Willow stakes did not survive. Monitoring is recommended due to downcutting at inlet and upstream.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural aluminum plate) Fish Passage Rating: Green
Length(ft): 97.3
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 9.0
Condition Rating(1-5): 5
Approach Angle: 14.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Gravel
Width(ft):13.3 13.3
Height(ft):7.65 5.27
Apron Length(ft):
Water Depth(ft):0.29 0.18
Rustline Height(ft):
Substrate Depth(ft):0.35 2.73
Backwatered?: No
Baffles Present: No
Embedded?: Maybe
Embedded Depth(ft): 0.35
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.1
Culvert Gradient: 3.50%
Max Slope:
Max Slope Length:

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):3.74
Stream Flow Stage:Low
Stream Width Type Distance From
Crossing (ft)
Width (ft)
Upstream ordinary high water 62.8 8.30
Upstream ordinary high water 94.0 8.00
Upstream ordinary high water 153.0 6.40


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
U/S Grade Ctrl (Thalweg) 0.00 96.81
U/S Water Surface Elev 0.00 97.42
U/S Grade Ctrl (Thalweg) 35.00 96.13
U/S Water Surface Elev 35.00 96.65
Inlet Culvert Invert 56.00 96.23
U/S Water Surface Elev 56.00 96.52
Inlet Culvert Top 56.00 104.54
Outlet Culvert Top 153.30 101.13
Outlet Invert 153.30 95.20
D/S Water Surface Elev 153.30 95.38
D/S Thalweg 159.30 94.67
D/S Water Surface Elev 159.30 94.91
D/S Thalweg 195.30 94.07
D/S Water Surface Elev 195.30 94.26


  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