Fish Passage Site 20501520

Coordinates (dec. deg.): 61.99387°, -149.96294°
Legal Description: S022N004W14
Region: South Central
Road Name: South Silver Salmon Drive

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

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 MSB11-SSS01

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: Abraham Gioffre, Jim Latham

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: Yes
Construction Year: 2011


Site Observations:

  1. Culvert gradient gray
  2. Beaver Activity
  3. Inlet perch

Comments: Survey of a replacement culvert on South Silver Salmon Drive. Upst is Caswell Lake IV and dwst is a cobble gravel riffle which flows to a beaver dam about 175' dwst. About 90' dwst the riffle area connects to the beginning of the beaver pool water surface elevation. No stream widths or gradients taken due to upst lake and dwst beaver impoundment.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Structural steel plate) Fish Passage Rating: Gray
 
Length(ft): 50.1
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5): 4
Approach Angle:
Sedimentation At Inlet: Yes
Inlet Substrate: Cobble
Outlet Substrate: Cobble
InletOutlet
Width(ft):6.0 6.0
Height(ft):3.8 4.1
Apron Length(ft):0.0 0.0
Water Depth(ft): 0.71
Rustline Height(ft):0.0
Substrate Depth(ft):2.2 1.9
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 1.9
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 2.30%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient gray
  2. Beaver Activity
  3. Inlet perch

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelCobble
Subdominant:CobbleGravel
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)
D/S Thalweg (profile pt) 0.00 93.15
D/S Water Surface Elev 0.00 94.18
D/S Grade Ctrl (Thalweg) (grade pt where natural channel begins) 43.00 94.53
D/S Water Surface Elev 43.00 95.02
Outlet Culvert Top 87.00 98.90
Outlet Invert (invert on substrate) 87.00 94.70
D/S Water Surface Elev (outlet water surface) 87.00 95.41
Road Elev 112.00 100.98
Inlet Culvert Top 137.10 100.06
Inlet Culvert Invert (invert on substrate) 137.10 96.33
U/S Water Surface Elev (inlet water surface) 137.10 96.73
U/S Grade Ctrl (Thalweg) (top of beaver dam) 138.10 97.00
U/S Water Surface Elev (water surface over dam) 138.10 97.16
U/S Water Surface Elev 147.10 97.20
U/S Grade Ctrl (Thalweg) (profile pt in Caswell Lake) 147.10 95.33

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): 30.0
Comments: Trap set in lake away from culvert near boat launch. Set between 9/6/11 and 9/7/11.

Fish Observations

Species: threespine stickleback Life History: Resident
Total Fish Observed: 30 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Upstream Minnow Trap (30)  

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