Fish Passage Site 20401302

Coordinates (dec. deg.): 61.54164°, -149.52385°
Legal Description: S017N001W30
Region: South Central
Road Name: Marble Way

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

Elevation:

Site Comments: Borough 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 MSCS1-CT153

Observers: Gary Liepitz, Joe Conner, Nathan Pannkuk

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: CULVERT:substr. Dep: bottomless arch culvert-no depth measurement, slightly bowed. Technically Red but proably passes fish at most flows.

Culvert Measurements

ID: 1 Structure Type: Open-bottom arch (Structural steel plate) Fish Passage Rating: Gray
 
Length(ft): 30.5
Inlet Type: Projecting
Outlet Type:
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: Cobble
Outlet Substrate: Cobble
InletOutlet
Width(ft):9.5 9.5
Height(ft):5.2 5.3
Apron Length(ft):
Water Depth(ft):1.3 1.3
Rustline Height(ft):
Substrate Depth(ft):
Backwatered?:
Baffles Present: No
Embedded?: Yes
Outfall Height:
Outfall Type:
Constriction Ratio: 0.23
Culvert Gradient: 3.05%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Other, including vibrations, cavitation, etc.

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleCobble
Subdominant:
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 50.0 28.00
Downstream ordinary high water 100.0 30.00
Upstream ordinary high water 50.0 38.00
Upstream ordinary high water 137.0 43.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Culvert Top 1 93.19
Inlet Culvert Top 1 93.89
D/S Thalweg 0.00 100.0 86.73
D/S Thalweg 50.00 50.0 87.46
Max Pool Depth 98.00 2.0 87.72
Outlet Invert 1 100.00 0.0 87.73
Outlet Thalweg 1 100.00 0.0 87.73
Road Elev 115.00 95.60
Road Elev 115.00 95.62
Inlet Culvert Invert 1 130.00 0.0 88.66
Inlet Thalweg 1 130.00 0.0 88.66
U/S Thalweg 1 133.00 3.0 88.93
U/S Thalweg 1 140.00 10.0 88.53
U/S Thalweg 180.00 50.0 88.71
U/S Thalweg 267.00 137.0 89.53

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.

Photos

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