Fish Passage Site 20401355

Coordinates (dec. deg.): 61.57862°, -149.28677°
Legal Description: S017N001E09
Region: South Central
Road Name: Lower Road

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #: 247-50-10260-2019-3041
Stream Name: Wasilla Creek tributary

Elevation:

Site Comments: Lower Road - near Hyer 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-LOW01

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

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2003


Site Observations:

  1. Culvert gradient gray
  2. Compound gradient in pipe

Comments: Post-replacement survey of MSCS1WA52; Adult salmon obs d/s; u/s gradient = 0.53%; prob not barrier, almost embedded

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 46.2
Inlet Type: Flared Inlet
Outlet Type: Flared Inlet
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 4
Approach Angle: 18.0
Sedimentation At Inlet: Yes
Inlet Substrate: Silt/Clay
Outlet Substrate: Silt/Clay
InletOutlet
Width(ft):5.3 5.3
Height(ft):3.1 2.7
Apron Length(ft):4.7 4.7
Water Depth(ft): 0.82
Rustline Height(ft):
Substrate Depth(ft):0.6 0.7
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.86
Culvert Gradient: 1.15%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient gray
  2. Compound gradient in pipe

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClaySilt/Clay
Subdominant:GravelGravel
Stream Slope(deg.):0.53
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 45.0 6.00
Upstream ordinary high water 63.0 4.50
Upstream ordinary high water 100.0 8.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 1 101.89
D/S Grade Ctrl (Thalweg) 1 0.00 42.0 96.13
D/S Water Surface Elev (ws @ gp) 1 0.00 42.0 96.29
D/S Water Surface Elev (ws @ TWC) 1 28.80 13.2 96.98
D/S Tailcrest or 1st Thalweg 1 28.80 13.2 96.69
D/S Thalweg (end of outlet apron) 1 37.30 4.7 96.01
Outlet Pool Water Elev 1 42.00 96.99
Outlet Invert (on substrate) 1 42.00 0.0 96.17
U/S Headwater 1 88.20 97.34
Inlet Culvert Invert (on substrate) 1 88.20 0.0 96.70
U/S Thalweg (end of inlet apron) 1 92.90 4.7 96.42
U/S Grade Ctrl (Thalweg) 1 158.20 70.0 97.46
U/S Water Surface Elev 1 158.20 70.0 97.74
U/S Water Surface Elev (u/s ws) 1 206.20 118.0 97.97

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): 1.25
Comments: 80ft d/s
 
Gear Type: Minnow Trap (B) Trap Duration(h): 1.25
Comments: no fish caught; 20ft u/s
 
Gear Type: Visual Observation, Ground (C)
Comments: Visual observation of adult Sockey salmon downstream from culvert.

Fish Observations

Species: coho salmon Life History: Resident (Suspected Spawning)
Total Fish Observed: 13 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Downstream Minnow Trap (13)  

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