Fish Passage Site 20400626

Coordinates (dec. deg.): 61.47358°, -149.18980°
Legal Description: S016N001E13
Region: South Central
Road Name: Old Glenn Highway

Datum: NAD83
Quad Name / ITM: Anchorage B-6
AWC Stream #:
Stream Name: Unnamed

Elevation:

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 MSB23-MS012

Project Supervisor: Michael Mazzacavallo, Alaska Department of Fish and Game — Anchorage, AK
Observers: Michael Mazzacavallo, Kat Leavitt, Beth Evers

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2012


Site Observations:

  1. Culvert gradient gray
  2. Constriction ratio red

Comments: Replaced in 2012. Sediment shelf over apron (1.35ft tall) Inlet is steep cascading with pools. Outlet pools following a steady gradient down pools.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 50.97
Inlet Type: Flared Inlet
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 4
Approach Angle: 0.0
Sedimentation At Inlet: Yes
Inlet Substrate: Cobble
Outlet Substrate: Cobble
InletOutlet
Width(ft):3.0 3.0
Height(ft):3.0 3.0
Apron Length(ft):4.9 0.0
Water Depth(ft):0.0 0.34
Rustline Height(ft):0.8
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.7
Outfall Type: At Stream Grade
Constriction Ratio: 0.46
Culvert Gradient: 8.00%
Max Slope:
Max Slope Length:
 

Comments: Stream aluvial fan with lots of sediment.

  Culvert Observations:
  1. Culvert gradient red
  2. Constriction ratio red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleCobble
Subdominant:SandSand
Stream Slope(deg.):11.4
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Stream
Width (ft)
Upstream ordinary high water 29.0 6.00
Upstream ordinary high water 59.0 5.10
Upstream ordinary high water 77.0 8.20
Upstream ordinary high water 100.0 6.70

Elevations

Locator ID Culvert
Number
River
Distance (ft)1
Distance From
Crossing (ft)2
Relative
Elevation (ft)
U/S Thalweg (Inlet Apron Bottom) 93.77
U/S Thalweg (Inlet Apron Top) 93.33
Road Elev 97.51
D/S Thalweg 2.00 80.32
D/S Water Surface Elev 2.00 80.39
D/S Thalweg 30.00 83.27
D/S Water Surface Elev 30.00 83.52
D/S Thalweg 59.00 85.31
D/S Water Surface Elev 59.00 85.70
D/S Water Surface Elev 70.00 86.14
D/S Thalweg 70.00 85.70
D/S Thalweg 78.00 86.59
D/S Water Surface Elev 78.00 86.90
D/S Water Surface Elev 79.00 87.23
D/S Thalweg 79.00 86.79
D/S Thalweg 89.00 87.30
D/S Water Surface Elev 89.00 87.82
D/S Water Surface Elev 92.00 88.33
D/S Thalweg 92.00 87.73
D/S Thalweg 100.00 88.47
D/S Water Surface Elev 100.00 89.29
Outlet Invert 101.00 89.34
D/S Water Surface Elev 101.00 89.68
Outlet Culvert Top 101.00 92.84
Inlet Culvert Invert 151.97 93.42
U/S Water Surface Elev 151.97 93.61
Inlet Culvert Top 151.97 96.64
U/S Thalweg (Sediment Wedge) 157.97 94.86
U/S Water Surface Elev (Sediment Wedge) 157.97 94.90
U/S Thalweg 179.97 96.27
U/S Water Surface Elev 179.97 96.65
U/S Thalweg 187.97 98.63
U/S Water Surface Elev 187.97 98.78
U/S Thalweg 201.97 99.98
U/S Water Surface Elev 201.97 100.66
U/S Thalweg 225.97 103.87
U/S Water Surface Elev 225.97 104.15
U/S Thalweg 250.97 108.29
U/S Water Surface Elev 250.97 108.68

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