Fish Passage Site 20501057

Coordinates (dec. deg.): 61.59937°, -149.69269°
Legal Description: S017N002W06
Region: South Central
Road Name: Carousel Way

Datum: NAD83
Quad Name / ITM: Anchorage C-8
AWC Stream #:
Stream Name: Layen Lake Drainage


Site Comments: Crossing at junction of Carousel Way and Skyview Drive. Site 20501056 upstream on ATV trail at outlet of Layen Lake.

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-CAR01

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: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

  1. Constriction ratio gray

Comments: Culvert is creating backwater on inlet side. Straw wattles left at inlet and outlet after construction. One culvert is present between this one and lake outlet upstream-s under an ATV trail. Dense grass is present. Some ATV/snow machine traffic use adjacent to the stream near/at outlet. Silt fence is up between the creek and Carousel Way. Possibly undersized. Not much of a defined channel above or below. Ordinary High Water measurements taken upstream where the channel had some definition.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Corrugated steel) Fish Passage Rating: Gray
Length(ft): 62.3
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5): 5
Approach Angle:
Sedimentation At Inlet: No
Inlet Substrate: Sand
Outlet Substrate: Sand
Width(ft):2.8 2.88
Height(ft):1.94 2.0
Apron Length(ft):
Water Depth(ft): 0.42
Rustline Height(ft):
Substrate Depth(ft): 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.74
Culvert Gradient: 0.82%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Constriction ratio gray

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 0.00 98.00
D/S Water Surface Elev 0.00 98.20
Top of Pipe Inlet 4.00 100.11
Inlet Culvert Invert (on pipe) 4.00 98.02
U/S Water Surface Elev 4.00 98.19
Outlet Culvert Top 66.30 99.60
Outlet Invert (on pipe) 66.30 97.55
D/S Water Surface Elev 66.30 97.97
D/S Thalweg (on mud; soft mud is 2 ft deep) 81.30 97.03
D/S Water Surface Elev 81.30 97.42


  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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