Fish Passage Site 20401347

Coordinates (dec. deg.): 61.72003°, -149.11873°
Legal Description: S019N002E20
Region: South Central
Road Name: ATV Trail

Datum: NAD83
Quad Name / ITM: Anchorage C-6
AWC Stream #:
Stream Name: Wasilla Creek tributary

Elevation:

Site Comments: Trib to Wasilla Ck. ATV trail off of Murphy Road.

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-ATV01

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

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: Yes
Construction Year: 2008


Site Observations:

  1. None of this type

Comments: Post-Replacement survey of MSCS1WA043; Step-pools in pipe (fish passage project). Upstream grade = 5.11%;

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 30.4
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5): 4
Approach Angle: 4.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):6.0 6.0
Height(ft):3.9 4.6
Apron Length(ft):
Water Depth(ft): 0.36
Rustline Height(ft):0.0
Substrate Depth(ft):2.1 1.4
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 1.4
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.92
Culvert Gradient: 5.69%
Max Slope:
Max Slope Length:
 

Comments: Step-pools in pipe (fish passage project).u/s grade = 5.11%;
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:GravelGravel
Stream Slope(deg.):5
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 30.0 7.00
Upstream ordinary high water 60.0 6.50
Upstream ordinary high water 90.0 6.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Pool Water Elev 1 94.73
U/S Headwater 1 96.45
D/S Grade Ctrl (Thalweg) 1 0.00 20.0 94.10
D/S Water Surface Elev (@GP) 1 0.00 20.0 94.25
D/S Tailcrest or 1st Thalweg 1 15.00 5.0 94.54
D/S Water Surface Elev (@TWC) 1 15.00 5.0 94.70
D/S Thalweg (bottom of out pool) 1 19.00 1.0 94.31
Outlet Invert 1 20.00 0.0 94.37
Road Elev 1 35.00 101.26
Inlet Culvert Invert (on substrate) 1 50.40 0.0 96.10
U/S Grade Ctrl (Thalweg) (TC of 1st pool u/s) 1 54.40 4.0 96.71
D/S Water Surface Elev (@GP) 1 54.40 4.0 96.86
U/S Grade Ctrl (Thalweg) 1 68.40 18.0 97.59
D/S Water Surface Elev (@GP) 1 68.40 18.0 97.92
U/S Grade Ctrl (Thalweg) 1 104.40 54.0 99.24
D/S Water Surface Elev (@GP) 1 104.40 54.0 99.52
U/S Grade Ctrl (Thalweg) 1 134.40 84.0 100.58
D/S Water Surface Elev (@GP) 1 134.40 84.0 100.94
U/S Grade Ctrl (Thalweg) 1 149.40 99.0 101.46
D/S Water Surface Elev (@GP) 1 149.40 99.0 101.71

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): 1.5
Channel Type: Main Channel (>50% of water flow)
Comments: 15ft d/s
 
Gear Type: Minnow Trap (B) Trap Duration(h): 1.5
Channel Type: Main Channel (>50% of water flow)
Comments: 50ft u/s

Fish Observations

Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 18 Fish Measured: 18 Fork Lengths (mm) Min: 38 Max: 61 Mean: 49
Collected/Observed by Gear Type: Upstream Minnow Trap (8)  Downstream Minnow Trap (10)  
 
Species: juvenile Dolly Varden Life History: Not Recorded
Total Fish Observed: 1 Fish Measured: 1 Fork Lengths (mm) Min: 80 Max: 80 Mean: 80
Collected/Observed by Gear Type: Upstream Minnow Trap (1)  

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