Fish Passage Site 20401328

Coordinates (dec. deg.): 61.61259°, -149.23594°
Legal Description: S018N001E35
Region: South Central
Road Name: Colony School Drive

Datum: NAD83
Quad Name / ITM: Anchorage C-6
AWC Stream #: 247-50-10260-2019-3066
Stream Name: Walby Creek

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 MSCS1-WA020

Observers: Edward Weiss, Olof Jacobsson, Joe Conner

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: Cobbles placed in inlet and outlet flares.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated Metal) Fish Passage Rating: Gray
 
Length(ft): 81.0
Inlet Type: Mitered
Outlet Type:
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):3.3 3.3
Height(ft):2.7 2.8
Apron Length(ft):
Water Depth(ft):0.5 0.5
Rustline Height(ft):
Substrate Depth(ft):0.6 0.5
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type:
Constriction Ratio: 0.6
Culvert Gradient: 0.77%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. None of this type

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 48.0 5.00
Downstream ordinary high water 108.0 6.00
Upstream ordinary high water 50.0 6.00
Upstream ordinary high water 100.0 5.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
U/S Thalweg 87.89
U/S Thalweg 87.92
Outlet Culvert Top 1 90.69
Inlet Culvert Top 1 91.27
D/S Thalweg 0.00 108.0 87.98
D/S Thalweg 60.00 48.0 87.67
OHW Left Bank 96.00 12.0 87.72
Outlet Invert 1 108.00 0.0 88.01
Outlet Thalweg 1 108.00 0.0 88.29
Road Elev 148.50 94.36
Road Elev 148.50 94.42
Inlet Culvert Invert 1 189.00 0.0 88.63

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): 0
Comments: Trap disturbed by crew - trap set a second time - see second record
 
Gear Type: Minnow Trap (B) Trap Duration(h): 0
Comments: Set 50' upstream - crushed by work crew - short set

Fish Observations

Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 9 Fish Measured: 6 Fork Lengths (mm) Min: 65 Max: 73 Mean: 69
Collected/Observed by Gear Type: Upstream Minnow Trap (9)  
 
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: Downstream Minnow Trap (0)  Upstream Minnow Trap (0)  
Comments: Set 50' upstream - crushed by work crew - short set

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