Fish Passage Site 20501521

Coordinates (dec. deg.): 61.77174°, -150.06174°
Legal Description: S019N004W06
Region: South Central
Road Name: Stinson Road

Datum: WGS84
Quad Name / ITM: Tyonek D-1
AWC Stream #:
Stream Name: Willow Creek tributary

Elevation:

Site Comments: None

Survey Date: May 13, 2009

Survey PRK09-STN01

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

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: Yes

Step Pools: No
Construction Year:


Site Observations:

  1. Beaver Activity
  2. Shallow fill; inadequate roadfill volume above culvert
  3. Inlet apron too steep

Comments: HWS= TWS= backwatered. No CR b/c u/s is beaver pond and d/s is slough.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Structural steel plate) Fish Passage Rating: Green
 
Length(ft): 40.1
Inlet Type: Flared Inlet
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.75
Condition Rating(1-5): 5
Approach Angle: 18.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):3.95 4.0
Height(ft):3.9 3.9
Apron Length(ft):5.8
Water Depth(ft): 2.07
Rustline Height(ft):1.5
Substrate Depth(ft):0.0 0.0
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 1.37%
Max Slope: 14.14
Max Slope Length:
  Culvert Observations:
  1. Beaver Activity
  2. Shallow fill; inadequate roadfill volume above culvert
  3. Inlet apron too steep

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClayCobble
Subdominant:Silt/ClaySilt/Clay
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)
D/S Grade Ctrl (Thalweg) 1 0.00 34.5 95.09
D/S Water Surface Elev (WS @ GP) 1 0.00 34.5 97.61
D/S Tailcrest or 1st Thalweg 1 18.70 15.8 95.94
D/S Water Surface Elev (WS @ TWC) 1 18.70 15.8 97.55
D/S Thalweg 1 21.40 13.1 95.80
D/S Thalweg 1 25.50 9.0 95.49
Outlet Invert 1 34.50 0.0 95.50
Outlet Pool Water Elev 1 34.50 0.0 97.57
Road Elev 1 54.50 101.20
U/S Headwater 1 74.50 0.0 97.56
Inlet Culvert Invert 1 74.50 0.0 96.05
U/S Thalweg (end of apron) 1 80.30 5.8 96.87
U/S Thalweg (streambed at end of apron (on mud)) 1 80.40 5.9 95.80

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.

Photos

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