Fish Passage Site 20501464

Coordinates (dec. deg.): 61.98914°, -149.96030°
Legal Description: S022N004W23
Region: South Central
Road Name: Hidden Hills Road

Datum: WGS84
Quad Name / ITM: Anchorage D-8
AWC Stream #: 247-41-10200-2190-3020
Stream Name: Caswell Creek tributary

Elevation:

Site Comments: Creek is the outlet stream to the smaller Caswell Lakes complex.

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 PRK09-HHR01

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Site Observations:

  1. Mechanical damage or joints parting
  2. Compound gradient in pipe
  3. Culvert gradient red
  4. Constriction ratio red

Comments: Culvert outlet separating in multiple places. Two 3'x3' overflow pipes (.5"x2.67" corr) above main pipe, outlets clear, inlets full of gravel

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 69.2
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.25
Corrugation Width(in.): 2.75
Condition Rating(1-5): 2
Approach Angle: 32.0
Sedimentation At Inlet: Yes
Inlet Substrate: Cobble
Outlet Substrate: None
InletOutlet
Width(ft):4.4 4.8
Height(ft):4.0 4.9
Apron Length(ft):
Water Depth(ft): 1.75
Rustline Height(ft):1.4
Substrate Depth(ft):0.7 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.43
Culvert Gradient: 2.64%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Mechanical damage or joints parting
  2. Compound gradient in pipe
  3. Culvert gradient red
  4. Constriction ratio red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelCobble
Subdominant:GravelGravel
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 168.0 11.00
Upstream ordinary high water 190.0 10.50
Upstream ordinary high water 215.0 9.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Pool Water Elev (wd = 1.75 at invert) 93.92
U/S Headwater (wd = 0.73 @ invert) 94.73
D/S Grade Ctrl (Thalweg) 0.00 60.0 91.56
D/S Water Surface Elev (wd = 0.92 @ GP) 0.00 60.0 92.48
D/S Tailcrest or 1st Thalweg 35.50 24.5 92.91
D/S Water Surface Elev (wd = 1.05 at TWC) 35.50 24.5 93.96
D/S Thalweg (bottom of pool) 51.50 8.5 91.31
D/S Water Surface Elev (pool ws) 54.60 5.4 95.04
D/S Thalweg 55.00 5.0 91.60
Road Elev 94.50 109.47
Inlet Culvert Invert 129.00 0.0 94.00
U/S Grade Ctrl (Thalweg) (TC of large pool u/s) 134.40 5.4 94.14

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: Visual Observation, Ground (A)
Comments: Observed about 6 salmonids in upstream pool possibly trout, estimated length about 30cm
 
Gear Type: Visual Observation, Ground (B)
Comments: Observed dead adult sockey carcass downstream of culvert.

Fish Observations

Species: trout-unspecified Life History: Unknown
Total Fish Observed: 6 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Upstream Visual Observation, Ground (6)  
 
Species: carcass sockeye salmon Life History: Anadromous
Total Fish Observed: 1 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Downstream Visual Observation, Ground (1)  

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