Fish Passage Site 20501461

Coordinates (dec. deg.): 62.00057°, -149.95615°
Legal Description: S022N004W14
Region: South Central
Road Name: Caswell Lakes Road

Datum: WGS84
Quad Name / ITM: Talkeetna Mts A-6
AWC Stream #: 247-41-10200-2190-3020
Stream Name: Unnamed

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 UPD20-CLR01

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: Gillian O'Doherty, Kim Clark

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2019


Comments: Low flow along the left edge of the pipe. Erosion on all slopes upstream and downstream. Poor willow survival. Damage to root wads just downstream of outlet. Erosion control materials not removed yet.

Culvert Measurements

ID: 1 Structure Type: Box culvert (Structural aluminum plate) Fish Passage Rating: Green
 
Length(ft): 41.2
Inlet Type: Headwall
Outlet Type: Headwall
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 9.0
Condition Rating(1-5): 5
Approach Angle: 90.0
Sedimentation At Inlet: Yes
Inlet Substrate: Cobble
Outlet Substrate: Gravel
InletOutlet
Width(ft):16.0 16.0
Height(ft):5.8 5.4
Apron Length(ft):
Water Depth(ft): 0.15
Rustline Height(ft):
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 2.5
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 3.55
Culvert Gradient: 1.94%
Max Slope:
Max Slope Length:
ID: 2 Structure Type: Box culvert (Structural aluminum plate) Fish Passage Rating:
 
Length(ft): 63.6
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 9.0
Condition Rating(1-5): 5
Approach Angle: 90.0
Sedimentation At Inlet: No
Inlet Substrate: Cobble
Outlet Substrate: Gravel
InletOutlet
Width(ft):5.4 9.2
Height(ft):5.4 9.2
Apron Length(ft):
Water Depth(ft):
Rustline Height(ft):
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 3.6
Outfall Type: Overflow Pipe
Constriction Ratio:
Culvert Gradient: 0.27%
Max Slope:
Max Slope Length:
 

Comments: Overflow pipe, not included in rating.

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClayGravel
Subdominant:GravelCobble
Stream Slope(deg.):
Stream Flow Stage:Low

No stream width data available.

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Invert (outlet of Pipe # 2) 94.62
Inlet Culvert Invert (Inlet of Pipe #2) 94.82
Outlet Culvert Top (measurement taken on Rib) 98.54
Inlet Culvert Top 98.71
D/S Thalweg (channel tie in) 0.00 89.31
D/S Water Surface Elev 0.00 89.76
D/S Thalweg (bottom of outlet riffle) 27.00 90.30
D/S Water Surface Elev 27.00 90.41
D/S Thalweg (below overflow outlet) 132.00 91.33
D/S Water Surface Elev 132.00 91.66
Outlet Invert (Outlet of Pipe #1) 188.00 92.67
D/S Water Surface Elev 188.00 92.82
Outlet Culvert Top 188.00 98.35
Inlet Culvert Invert (Inlet of Pipe #1) 229.20 92.91
U/S Water Surface Elev 229.20 93.32
Inlet Culvert Top 229.20 99.15
U/S Thalweg 269.20 93.97
U/S Water Surface Elev 269.20 94.28
U/S Water Surface Elev 344.20 96.81
U/S Grade Ctrl (Thalweg) 344.20 96.64
U/S Water Surface Elev 357.20 96.77
U/S Thalweg 357.20 97.57

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