Fish Passage Site 20401279

Coordinates (dec. deg.): 61.57534°, -149.40413°
Legal Description: S017N001W11
Region: South Central
Road Name: Parks Highway

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

Elevation:

Site Comments: Pond upstream & downstream of culvert.

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-CT128

Observers: Doug Hill, Joe Conner, Michael Wheel

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: Pond upstream & downstream of culvert. Site was revisited in 2011 and following notes are from that visit: ponded upstream and downstream. Culvert does appear to be undersize for location & there is significant current/ flow through culvert. Fish seen upstream, downstream and in culvert. Gradient appears fairly flat. Pipe is not embedded, but does have some substrate thoughout culvert.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating: Gray
 
Length(ft): 109.0
Inlet Type: Mitered
Outlet Type:
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):6.0 6.0
Height(ft):5.2 5.4
Apron Length(ft):
Water Depth(ft):1.7 1.8
Rustline Height(ft):
Substrate Depth(ft):0.8 0.6
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 0.45%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:
Stream Slope(deg.):
Stream Flow Stage:Medium

No stream width data available.

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Culvert Top 1 84.38
Inlet Culvert Top 1 84.50
D/S Tailcrest or 1st Thalweg 0.00 13.6 79.37
Outlet Invert 1 13.60 0.0 78.94
Road Elev 68.10 97.71
Road Elev 68.10 98.09
Inlet Culvert Invert 1 122.60 0.0 79.43
Inlet Thalweg 1 122.60 0.0 79.43

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: Minnow Trap (A)
 
Gear Type: Visual Observation, Ground (C)

Fish Observations

Species: adult coho salmon Life History: Anadromous (Suspected Spawning)
Total Fish Observed: 30 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Upstream Visual Observation, Ground (30)  
Comments: Approximately 30 adult coho observed moving thru 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 Minnow Trap ()  
Comments: Numerous juvenile fish observed upstream and downstream of culvert

Photos

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