Fish Passage Site 20401291

Coordinates (dec. deg.): 61.52220°, -149.52682°
Legal Description: S017N001W31
Region: South Central
Road Name: Surrey Road

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #: 247-50-10300-2012
Stream Name: Cottonwood Slough

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-MS029

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:


Site Observations:

  1. Constriction ratio red
  2. Culvert gradient gray

Comments: None

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 49.99
Inlet Type: Projecting
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: No
Inlet Substrate: Cobble
Outlet Substrate: Organic
InletOutlet
Width(ft):6.93 6.7
Height(ft):4.67 4.39
Apron Length(ft):
Water Depth(ft):0.0 1.15
Rustline Height(ft):0.62
Substrate Depth(ft):0.52 0.85
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height:
Outfall Type: At Stream Grade
Constriction Ratio: 0.69
Culvert Gradient: 2.12%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Constriction ratio red
  2. Culvert gradient gray

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicOrganic
Subdominant:SandSand
Stream Slope(deg.):0.74
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 47.0 9.30
Downstream ordinary high water 69.0 11.80
Downstream ordinary high water 103.0 8.90

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
U/S Thalweg 3.00 92.45
U/S Water Surface Elev 3.00 95.64
U/S Thalweg 96.00 96.13
U/S Water Surface Elev 96.00 96.46
U/S Water Surface Elev 97.00 95.79
U/S Thalweg 97.00 93.80
Inlet Culvert Invert 100.00 93.84
U/S Water Surface Elev 100.00 94.42
Inlet Culvert Top 100.00 98.65
Outlet Culvert Top 149.99 97.59
D/S Water Surface Elev 149.99 94.40
Outlet Invert 149.99 93.25
D/S Thalweg 160.99 93.32
D/S Water Surface Elev 160.99 94.25
D/S Water Surface Elev 217.99 93.84
D/S Thalweg 217.99 91.81
D/S Thalweg 274.99 91.79
D/S Water Surface Elev 274.99 93.63

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