Fish Passage Site 20400588

Coordinates (dec. deg.): 61.73055°, -148.79634°
Legal Description: S019N004E18
Region: South Central
Road Name: Glenn Highway

Datum: NAD83
Quad Name / ITM: Anchorage C-5
AWC Stream #:
Stream Name: Matanuska River tributary

Elevation:

Site Comments: Site is between Mile Post 64 and 65. Under 4 lanes of road.

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 MSB11-GL264

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: Mark Eisenman, John Greuey

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient gray
  2. Woody Debris
  3. Beaver Activity
  4. Constriction ratio gray

Comments: Culvert had no flow at time of survey. U/S has heavy beaver activity with wide pools. Small beaver dam at inlet completely plugging culvert. Small overflow culvert present. Upstream of beaver dam there is slight flow out of pond and water goes subsurface before reaching pipe. Downstream channel appears mechanically influenced with fairly consistant stream width.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 91.4
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 3
Approach Angle: 10.0
Sedimentation At Inlet: Yes
Inlet Substrate: Cobble
Outlet Substrate: Organic
InletOutlet
Width(ft):5.35 5.3
Height(ft):2.7 3.1
Apron Length(ft):
Water Depth(ft):0.0 0.0
Rustline Height(ft):
Substrate Depth(ft):0.85 0.7
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.57
Culvert Gradient: 1.06%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient gray
  2. Woody Debris
  3. Beaver Activity
  4. Constriction ratio gray

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:CobbleCobble
Stream Slope(deg.):
Stream Flow Stage:Dry
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 70.0 9.50
Downstream ordinary high water 102.0 9.70
Downstream ordinary high water 128.0 8.90

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 105.46
D/S Grade Ctrl (Thalweg) (Stream dry downstream from pipe) 0.00 97.27
D/S Tailcrest or 1st Thalweg 51.00 97.35
Outlet Invert 80.00 97.28
Outlet Culvert Top 80.00 100.41
Inlet Culvert Top 171.40 101.38
Inlet Culvert Invert 171.40 98.69
Misc. (Top of Beaver Dam in front of Inlet) 175.40 99.84
U/S Thalweg (Profile point) 179.40 98.35
U/S Water Surface Elev 179.40 98.66

Notes:

  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 dfg.dsf.webmaster@alaska.gov