Fish Passage Site 20300204

Coordinates (dec. deg.): 60.95722°, -149.11594°
Legal Description: S010N002E16
Region: South Central
Road Name: Alyeska Avenue

Datum: NAD83
Quad Name / ITM: Seward D-6
AWC Stream #:
Stream Name: Glacier Creek tributary


Site Comments: Site is downstream of ALY05 and ALY06. All three culverts are in immediate proximity of each other.

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-ALY04

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

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2020

Site Observations:

  1. Culvert is poorly aligned

Comments: Upstream widths were not taken during survey because it has a double confluence and culvert in general vicinity. Inlet has 2 tributaries from opposing 90 degree angles. Plastic wrapped wattles left in channel ~28 D/S

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Gray
Length(ft): 50.9
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 5
Approach Angle: 90.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Gravel
Width(ft):5.03 5.0
Height(ft):4.5 4.0
Apron Length(ft):
Water Depth(ft): 0.55
Rustline Height(ft):0.5
Substrate Depth(ft):0.5 1.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.85
Culvert Gradient: 3.20%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert is poorly aligned

Stream Measurements

Stream SubstratesUpstreamDownstream
Stream Slope(deg.):2.7
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Width (ft)
Downstream ordinary high water 17.0 5.55
Downstream ordinary high water 26.0 7.60
Downstream ordinary high water 32.0 4.56


Locator ID Culvert
Distance (ft)1
Distance From
Crossing (ft)2
Elevation (ft)
Road Elev 99.97
Outlet Culvert Top 0.00 97.00
Outlet Invert 0.00 92.95
D/S Water Surface Elev 0.00 93.50
Inlet Culvert Top 50.90 98.67
Inlet Culvert Invert 50.90 94.29
U/S Thalweg (Tailcrest) 50.90 99.97


  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

Gear Type: Minnow Trap (A) Trap Duration(h): 3.1
Channel Type: Main Channel (>50% of water flow)
Comments: stream was ditched. 5 traps were set to survey 3 culverts.

Fish Observations

Species: juvenile Dolly Varden Life History: Resident
Total Fish Observed: 5 Fish Measured: 5 Fork Lengths (mm) Min: 55 Max: 103 Mean: 87
Collected/Observed by Gear Type: At Site Minnow Trap (1)  

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