Fish Passage Site 20401287

Coordinates (dec. deg.): 61.62344°, -149.31329°
Legal Description: S018N001E29
Region: South Central
Road Name: Caribou Street

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

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 MSCS1-CT136

Observers: Edward Weiss, Joe Conner, Doug Hill

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: Sheet pile headwall on upstream side of culvert, X-section velocity taken 125' upstream above culvert due to woody debris

Culvert Measurements

ID: 1 Structure Type: Open-bottom arch (Strutural Metal Plate) Fish Passage Rating: Green
 
Length(ft): 41.4
Inlet Type: Headwall
Outlet Type:
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: Sand
Outlet Substrate: Sand
InletOutlet
Width(ft):9.0 9.0
Height(ft):4.6 4.4
Apron Length(ft):
Water Depth(ft):1.8 1.8
Rustline Height(ft):
Substrate Depth(ft):
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type:
Constriction Ratio:
Culvert Gradient: 0.34%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:SandSand
Subdominant:
Stream Slope(deg.):
Stream Flow Stage:High
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 50.0 19.00
Downstream ordinary high water 100.0 21.00
Upstream ordinary high water 52.0 15.50
Upstream ordinary high water 125.0 12.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Culvert Top 1 93.22
Inlet Culvert Top 1 93.30
D/S Thalweg 0.00 100.0 88.70
D/S Thalweg 50.00 50.0 88.46
D/S Thalweg 95.00 5.0 89.06
Outlet Invert 1 100.00 0.0 88.78
Outlet Thalweg 1 100.00 0.0 88.78
Road Elev 120.50 94.43
Road Elev 120.50 94.46
Inlet Thalweg 1 141.00 0.0 88.79
Inlet Culvert Invert 1 141.00 0.0 88.92
U/S Thalweg 1 146.00 5.0 89.26
U/S Thalweg 193.00 52.0 89.08
U/S Thalweg 266.00 125.0 88.86

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

Gear Type: Visual Observation, Ground (C)

Fish Observations

Species: adult coho salmon Life History: Anadromous (Suspected Spawning)
Total Fish Observed: 1 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Upstream Visual Observation, Ground (1)  
Comments: Adult coho observed in culvert
 
Species: general fish observation, no species information Life History: Not Recorded
Total Fish Observed: Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Upstream Visual Observation, Ground ()  
Comments: Juveniles observed in creek

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