Fish Passage Site 20502072

Coordinates (dec. deg.): 61.68013°, -149.30107°
Legal Description: S018N001E05
Region: South Central
Road Name: Private Drive

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #:
Stream Name: Little Creek

Elevation:

Site Comments: Culvert on private drive to the house at the Little Su Farms.

Survey Date: Sep 19, 2011

Survey MSB11-LSF01

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

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2010


Site Observations:

  1. None of this type

Comments: Culvert replacement done a few years ago. Post-replacement survey.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 20.4
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.5
Condition Rating(1-5): 5
Approach Angle: 40.0
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):5.97 5.97
Height(ft):3.52 3.1
Apron Length(ft):
Water Depth(ft): 0.18
Rustline Height(ft):
Substrate Depth(ft):2.6 2.2
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 2.2
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.25
Culvert Gradient: 1.91%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:SandSand
Subdominant:GravelGravel
Stream Slope(deg.):1.41
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 55.0 4.35
Upstream ordinary high water 78.0 4.70
Upstream ordinary high water 110.0 5.20

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Grade Ctrl (Thalweg) (GP) 0.00 95.91
D/S Water Surface Elev 0.00 96.28
D/S Grade Ctrl (Thalweg) (GP) 16.00 96.34
D/S Water Surface Elev 16.00 96.46
Outlet Invert (on substrate) 36.00 96.75
D/S Water Surface Elev (outlet water surface) 36.00 96.93
Outlet Culvert Top 36.00 100.00
Road Elev 46.00 101.38
Inlet Culvert Top 56.40 100.39
U/S Water Surface Elev (inlet water surface) 56.40 97.20
Inlet Culvert Invert (on substrate) 56.40 96.78
U/S Grade Ctrl (Thalweg) (GP) 68.40 97.20
U/S Water Surface Elev (used for stream grad) 68.40 97.43
U/S Grade Ctrl (Thalweg) (GP) 104.40 97.89
U/S Water Surface Elev 104.40 98.25
U/S Grade Ctrl (Thalweg) (GP) 166.40 98.88
U/S Water Surface Elev 166.40 98.95
U/S Water Surface Elev (used for stream grad) 186.40 99.09
U/S Grade Ctrl (Thalweg) (GP) 186.40 98.47

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.

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