Fish Passage Site 20501244

Coordinates (dec. deg.): 61.76426°, -149.58820°
Legal Description: S019N002W02
Region: South Central
Road Name: Willow Fishhook Road

Datum: WGS84
Quad Name / ITM: Anchorage D-7
AWC Stream #:
Stream Name: Willow 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 MSB09-WFR06

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Outfall height red
  2. Culvert gradient red
  3. Inlet perch
  4. Mechanical damage or joints parting

Comments: Inlet end badly bent; gradient calc'd using -1.8 u/s pro for invert in (bottom of inlet perch)

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 39.9
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 1
Approach Angle: 17.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):3.1 2.9
Height(ft):1.4 2.9
Apron Length(ft):
Water Depth(ft): 0.23
Rustline Height(ft):1.3
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 1.86
Outfall Type: Cascade Over Rip-Rap
Constriction Ratio:
Culvert Gradient: 2.23%
Max Slope: 22.22
Max Slope Length:
  Culvert Observations:
  1. Outfall height red
  2. Culvert gradient red
  3. Inlet perch
  4. Mechanical damage or joints parting

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleCobble
Subdominant:Silt/ClayCobble
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)
U/S Headwater (at end of pipe) 1 98.60
D/S Thalweg (confluence w/Willow Cr) 1 0.00 22.0 93.72
D/S Water Surface Elev 1 0.00 22.0 94.14
D/S Tailcrest or 1st Thalweg (TC of out pool) 1 14.00 8.0 95.10
Outlet Pool Water Elev (WS @ outlet pool) 1 14.00 8.0 95.48
D/S Thalweg (bottom of out pool) 1 15.00 7.0 94.56
D/S Thalweg (bottom of cascade) 1 18.50 3.5 94.93
Outlet Invert 1 22.00 0.0 97.11
Road Elev 1 41.50 101.68
U/S Thalweg (near bottom of inlet perch (use as invert for slope)) 1 60.10 -1.8 97.96
U/S Water Surface Elev (turbulent (@u/s pro)) 1 60.10 -1.8 98.17
Inlet Culvert Invert (end of pipe) 1 61.90 0.0 98.36
U/S Grade Ctrl (Thalweg) (1st TC u/s) 1 65.90 4.0 98.69
U/S Water Surface Elev (WS @ GP) 1 65.90 4.0 98.92

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: Minnow Trap (A) Trap Duration(h): 1.0
Comments: no fish caught; 100ft u/s; heavy iron stain in creek

Fish Observations

No fish observations occurred during this survey.

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