Fish Passage Site 20401273

Coordinates (dec. deg.): 61.62455°, -149.31351°
Legal Description: S018N001E29
Region: South Central
Road Name: Driveway

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #: 247-50-10300-2080
Stream Name: Cottonwood Creek tributary

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 MSB11-PDC02

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: John Greuey, Abraham Gioffre

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Constriction ratio red
  2. Culvert gradient red
  3. Mechanical damage or joints parting

Comments: Private drive located near end of N. Caribou St. Juvenile fish observed.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 30.75
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 3
Approach Angle: 37.0
Sedimentation At Inlet: No
Inlet Substrate: Cobble
Outlet Substrate: Gravel
InletOutlet
Width(ft):1.72 1.72
Height(ft):1.5 1.6
Apron Length(ft):0.0 0.0
Water Depth(ft): 0.33
Rustline Height(ft):0.6
Substrate Depth(ft):0.2 0.18
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.43
Culvert Gradient: 1.30%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Constriction ratio red
  2. Culvert gradient red
  3. Mechanical damage or joints parting

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleGravel
Subdominant:OrganicOrganic
Stream Slope(deg.):
Stream Flow Stage:Low
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 19.0 3.85
Downstream ordinary high water 30.0 4.15
Downstream ordinary high water 44.0 3.95

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Thalweg (Profile point. Substrate in middle of pool) 0.00 97.27
D/S Water Surface Elev 0.00 97.69
D/S Grade Ctrl (Thalweg) (Top of wooden debris riffle) 13.00 97.78
D/S Water Surface Elev 13.00 97.97
D/S Thalweg (Profile point. Middle of riffle) 35.00 98.07
D/S Water Surface Elev 35.00 98.22
D/S Grade Ctrl (Thalweg) (Top of riffle just outside of outlet) 45.00 98.45
D/S Water Surface Elev 45.00 98.65
Outlet Culvert Top 46.00 100.00
Outlet Invert (On substrate) 46.00 98.38
D/S Water Surface Elev (Water surface at outlet invert) 46.00 98.71
Road Elev 61.00 102.93
Inlet Culvert Top 76.75 100.41
Inlet Culvert Invert (On substrate) 76.75 98.88
U/S Water Surface Elev 76.75 99.18
U/S Water Surface Elev 84.75 99.25
U/S Thalweg (Profile point. On substrate in upstream pool.) 84.75 98.68

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 (A)
Comments: Juvenile fish observed.

Fish Observations

Species: general fish observation, no species information Life History: Not Recorded
Total Fish Observed: 5 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Upstream Visual Observation, Ground (5)  

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