Fish Passage Site 20401306

Coordinates (dec. deg.): 61.59488°, -149.33951°
Legal Description: S017N001E06
Region: South Central
Road Name: North Shoreline Drive

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

Elevation:

Site Comments: Between Cottonwood & Mud Lakes

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-CT158

Observers: Edward Weiss, Joe Conner, Jared Edgar

Overall Fish Passage Rating:

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: Between Cottonwood & Mud Lakes; Many coho in this reach

Culvert Measurements

ID: 1 Structure Type: Open-bottom arch (Strutural Metal Plate) Fish Passage Rating:
 
Length(ft): 48.1
Inlet Type: Projecting
Outlet Type:
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: Gravel
Outlet Substrate: Sand
InletOutlet
Width(ft):10.0 10.0
Height(ft):4.5 5.0
Apron Length(ft):
Water Depth(ft):1.2 1.54
Rustline Height(ft):
Substrate Depth(ft):
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type:
Constriction Ratio:
Culvert Gradient: 0.04%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelSand
Subdominant:
Stream Slope(deg.):
Stream Flow Stage:High
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 50.0 61.50
Downstream ordinary high water 100.0 51.50
Upstream ordinary high water 50.0 35.50
Upstream ordinary high water 100.0 14.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Thalweg 85.73
D/S Thalweg 86.69
U/S Thalweg 87.00
U/S Thalweg 87.85
Inlet Culvert Top 1 91.67
Outlet Culvert Top 1 91.85
Outlet Invert 1 0.00 0.0 86.78
Outlet Thalweg 1 0.00 0.0 86.78
Road Elev 24.00 93.75
Road Elev 24.00 94.84
Inlet Culvert Invert 1 48.00 0.0 86.80
Inlet Thalweg 1 48.50 0.5 86.86

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: Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Upstream Visual Observation, Ground ()  
Comments: Many adult coho observed upstream and downstream of culvert

Photos

Questions or comments about this report can be directed to dfg.dsf.webmaster@alaska.gov