Fish Passage Site 20401344

Coordinates (dec. deg.): 61.71796°, -149.12068°
Legal Description: S019N002E20
Region: South Central
Road Name: Murphy Road

Datum: NAD83
Quad Name / ITM: Anchorage C-6
AWC Stream #: 247-50-10260-2019-3120
Stream Name: Wasilla Creek tributary

Elevation:

Site Comments: The outlet area consists of three step pools created by piled cobble/boulders with one pool at the outlet.

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 MSCS1-WA040

Observers: Edward Weiss, Olof Jacobsson

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: Yes
Construction Year:


Site Observations:

  1. Improper bedding
  2. Structural Problem

Comments: Culvert sags in the middle - slight damage in the middle of pipe. Steep outlet has step log structure below. Tailcrest is C-shaped - 2 channels around gravel bar. SEE EXCELLENT FIELD SKETCHES IN ORIGINAL FIELD FORMS

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 56.8
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 3
Approach Angle:
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):3.0 3.0
Height(ft):3.0 3.0
Apron Length(ft):0.0 0.0
Water Depth(ft):0.5 0.7
Rustline Height(ft):
Substrate Depth(ft):1.0 1.0
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 1.0
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.38
Culvert Gradient: 3.80%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Improper bedding
  2. Structural Problem

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:CobbleCobble
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)
Inlet Road Edge (inlet edge of road) 97.07
U/S Thalweg (upst thalweg) 0.00 95.72
U/S OHW elevation (upst OHW mark elev) 0.00 96.47
U/S Thalweg (upst thalweg) 40.00 94.69
U/S OHW elevation (upst OHW mark elev) 40.00 95.38
U/S Thalweg (upst thalweg) 88.00 93.32
U/S Thalweg (upst thalweg) 88.00 93.68
Top of Pipe Inlet 90.00 96.16
U/S Thalweg (culvert inlet thalweg) 90.00 93.14
Inlet Culvert Invert (inlet invert) 90.00 93.18
Outlet Invert (outlet invert) 146.80 90.66
D/S Thalweg (culvert outlet thalweg) 146.80 90.57
Outlet Culvert Top 146.80 93.68
Outlet Road Edge (outlet edge of road) 146.80 97.08
Max Pool Depth (dwst outlet pool) 148.30 90.18
Max Pool Depth (max pool depth) 149.30 90.16
Misc. (outlet pool) 152.30 90.63
D/S Grade Ctrl (Thalweg) (notch in 1st step pool overflow) 159.80 90.35
D/S Grade Ctrl (Thalweg) (top of 1st step pool outlet) 159.80 91.17
D/S Grade Ctrl (Thalweg) (notch in 2nd step pool overflow) 172.80 88.86
D/S Grade Ctrl (Thalweg) (top of 2nd step pool outlet) 172.80 89.69
D/S Thalweg (thalweg of pool below 2nd step pool) 174.80 87.27
D/S Tailcrest or 1st Thalweg (tailcrest of pool below 2nd step pool) 179.80 87.69
D/S OHW Elev (dwst OHW mark elev) 179.80 88.88
D/S Thalweg (dwst thalweg) 194.80 86.88
D/S OHW Elev (dwst OHW mark elev) 194.80 88.60
D/S Thalweg (dwst thalweg) 236.80 85.33
D/S OHW Elev (dwst OHW mark elev) 236.80 86.38

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): 18
 
Gear Type: Minnow Trap (B) Trap Duration(h): 28
Comments: Trap set downstream of culvert & cottonwood log step structures.

Fish Observations

Species: juvenile/adult Dolly Varden Life History: Unknown
Total Fish Observed: 10 Fish Measured: 5 Fork Lengths (mm) Min: 98 Max: 107 Mean: 103
Collected/Observed by Gear Type: Downstream Minnow Trap (10)  
 
Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 14 Fish Measured: 7 Fork Lengths (mm) Min: 45 Max: 58 Mean: 49
Collected/Observed by Gear Type: Downstream Minnow Trap (14)  
 
Species: no fish collected or observed Life History: Not Applicable
Total Fish Observed: 0 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Upstream Minnow Trap (0)  

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