Fish Passage Site 20501183

Coordinates (dec. deg.): 61.68193°, -149.28561°
Legal Description: S018N001E04
Region: South Central
Road Name: Driveway

Datum: WGS84
Quad Name / ITM: Anchorage C-7
AWC Stream #:
Stream Name: Little Susitna River tributary

Elevation:

Site Comments: None

Survey Date: Jul 14, 2009

Survey MSB09-ELK01

Project Supervisor: Gillian O'Doherty, ADFG
Observers: Heidi Zimmer, Ben Histand

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2009


Site Observations:

  1. None of this type

Comments: Post-replacement survey; u/s gradient = 1.83%.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Green
 
Length(ft): 45.4
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 5
Approach Angle: 18.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):10.1 10.1
Height(ft):5.6 5.2
Apron Length(ft):
Water Depth(ft): 0.43
Rustline Height(ft):
Substrate Depth(ft):1.2 1.6
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 1.4
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.19
Culvert Gradient: 1.33%
Max Slope:
Max Slope Length:
 

Comments: Upstream gradient 1.83%. Sinuous channel in pipe.
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:GravelGravel
Stream Slope(deg.):1.83
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 95.0 9.50
Upstream ordinary high water 190.0 7.00
Upstream ordinary high water 235.0 9.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Pool Water Elev 1 95.04
U/S Headwater 1 95.81
D/S Water Surface Elev (WS @ GP) 1 0.00 40.0 24.65
D/S Grade Ctrl (Thalweg) 1 0.00 40.0 94.26
D/S Tailcrest or 1st Thalweg (weak GP @ fence) 1 11.00 23.0 94.68
D/S Water Surface Elev (WS @ TWC) 1 11.00 23.0 94.94
D/S Thalweg 1 22.00 18.0 94.49
D/S Thalweg 1 30.00 10.0 94.70
Outlet Invert 1 40.00 0.0 94.61
Road Elev 1 62.70 102.27
Inlet Culvert Invert 1 85.40 0.0 95.54
U/S Thalweg 1 111.90 26.5 96.24
U/S Grade Ctrl (Thalweg) (TC of 1st pool u/s) 1 137.40 52.0 96.73
U/S Water Surface Elev (WS @ GP) 1 137.40 52.0 97.11
U/S Water Surface Elev (WS @ GP) 1 155.40 70.0 97.20
U/S Grade Ctrl (Thalweg) 1 155.40 70.0 96.88
U/S Thalweg (toe of riffle) 1 191.40 106.0 97.03
U/S Grade Ctrl (Thalweg) 1 231.40 146.0 98.58
U/S Water Surface Elev (WS @ GP) 1 231.40 146.0 98.83

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