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 PRK09-SSD01

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. Culvert gradient red
  2. Outfall height red
  3. Mechanical damage or joints parting
  4. Shallow fill; inadequate roadfill volume above culvert

Comments: Both pipes separating at joint near outs. Lake upstream and beaver dams downstream.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 45.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 3
Approach Angle: 32.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):3.0 3.0
Height(ft):2.9 2.9
Apron Length(ft):
Water Depth(ft): 0.48
Rustline Height(ft):1.2
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.24
Outfall Type: Free Fall In To Pool
Constriction Ratio:
Culvert Gradient: 2.96%
Max Slope:
Max Slope Length:
 

Comments: Pipe 1 has several small dents down barrel.
  Culvert Observations:
  1. Culvert gradient red
  2. Outfall height gray
  3. Mechanical damage or joints parting
  4. Shallow fill; inadequate roadfill volume above culvert
ID: 2 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 45.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 3
Approach Angle: 32.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):2.9 3.0
Height(ft):2.9 3.0
Apron Length(ft):
Water Depth(ft): 0.46
Rustline Height(ft):1.0
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.45
Outfall Type: Free Fall In To Pool
Constriction Ratio:
Culvert Gradient: 2.57%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient red
  2. Outfall height red
  3. Mechanical damage or joints parting
  4. Shallow fill; inadequate roadfill volume above culvert

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:SandCobble
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)
Outlet Pool Water Elev (both pipes out pool) 95.94
U/S Headwater (lake ws) 97.91
D/S Grade Ctrl (Thalweg) 0.00 45.0 94.68
D/S Water Surface Elev 0.00 45.0 95.21
D/S Tailcrest or 1st Thalweg 32.00 13.0 94.55
D/S Water Surface Elev 32.00 13.0 95.95
D/S Thalweg (bottom scour pool out #1) 1 40.00 5.0 94.08
D/S Thalweg (bottom scour pool out #2) 2 40.00 5.0 94.40
Outlet Invert 2 45.00 0.0 95.93
Outlet Invert 1 45.00 0.0 95.70
Road Elev 67.50 100.91
Inlet Culvert Invert 1 90.00 0.0 97.05
Inlet Culvert Invert 2 90.00 0.0 97.10
U/S Thalweg 1 93.40 3.4 96.38
U/S Thalweg 2 96.00 6.0 95.83
U/S Thalweg (13' u/s both pipes) 103.00 13.0 94.91

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

No fish sampling occurred during this survey.

Fish Observations

No fish observations occurred during this survey.

Questions or comments about this report can be directed to dfg.dsf.webmaster@alaska.gov