Fish Passage Site 10302209

Coordinates (dec. deg.): 58.39183°, -134.63634°
Legal Description: C040S065E23
Region: Southeast
Road Name: Back Loop Road

Datum: NAD83
Quad Name / ITM: Juneau B-2
AWC Stream #:
Stream Name: Auke Lake tributary

Elevation:

Site Comments: Site is about 15 feet downstream from UND01

Survey Date: Jul 13, 2011

Survey SEA11-BLR01

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: Jason Olds, Charmagne Gutierrez

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: Yes

Step Pools: No
Construction Year:


Site Observations:

  1. Road Fill (pushed off road by grader)
  2. Culvert is poorly aligned

Comments: Muskeg ditch/drain system to Auke Lake. Highly urbanized area.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 68.9
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 2
Approach Angle: 53.0
Sedimentation At Inlet: No
Inlet Substrate: Silt/Clay
Outlet Substrate: Silt/Clay
InletOutlet
Width(ft):4.0 4.0
Height(ft):1.8 2.9
Apron Length(ft):
Water Depth(ft): 0.25
Rustline Height(ft):1.8
Substrate Depth(ft):2.2 1.1
Backwatered?: Yes
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 1.1
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 0.71%
Max Slope:
Max Slope Length:
 

Comments: ~15' DS UND01 Muskeg ditch drain system to Auke Lake, highly urbanized: No stream width taken. * Stream grade near zero. Tailwater control grade point higher than invert inlet making site backwatered.
  Culvert Observations:
  1. Road Fill (pushed off road by grader)
  2. Culvert is poorly aligned

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelSilt/Clay
Subdominant:Silt/ClayOrganic
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)
Road Elev 100.00
D/S Tailcrest or 1st Thalweg 0.00 95.00
D/S Water Surface Elev 0.00 95.21
Max Pool Depth 6.00 95.71
Outlet Pool Water Elev 6.00 95.17
D/S Water Surface Elev 10.00 95.19
Outlet Thalweg 10.00 94.94
Outlet Culvert Top 10.00 97.91
U/S Water Surface Elev 78.90 95.37
Inlet Thalweg 78.90 94.45
Inlet Culvert Top 78.90 96.75
U/S Headwater 79.00 95.36

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: None (A)
Comments: No traps set no fish observed.

Fish Observations

No fish observations occurred during this survey.

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