Fish Passage Site 10302207

Coordinates (dec. deg.): 58.39220°, -134.63556°
Legal Description: C040S065E23
Region: Southeast
Road Name: Back Loop Road

Datum: NAD83
Quad Name / ITM: Juneau B-2
AWC Stream #:
Stream Name: MB Creek

Elevation:

Site Comments: None

Survey Date: Jul 14, 2011

Survey SEA11-BLR03

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient red
  2. Road Fill (pushed off road by grader)

Comments: Fry visually observed upstream/downstream. Site is a ditch drainage to Auke Lake on Backloop Rd. Outlet damage from snow removal. Stream nearly flat water; mostly dry. US/DS. Stream grade ommited with dense foliage upstream and dry channel. *CR ommited, channelized; urban and muskeg US/DS.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 69.4
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.33
Corrugation Width(in.): 3.0
Condition Rating(1-5): 2
Approach Angle: 78.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):2.0 2.0
Height(ft):2.0 2.0
Apron Length(ft):
Water Depth(ft): 0.97
Rustline Height(ft):1.1
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 1.52%
Max Slope:
Max Slope Length:
 

Comments: Fry visually observed upstream/downstream ditch drainage on Backloop Rd. Outlet damage from snow removal. Stream nearly flat water; mostly dry. US/DS, muskeg/ditch drain to Auke Lake. Stream grade ommited with dense foliage US and dry channel. *CR ommited, channelized; urban and muskeg US/DS.
  Culvert Observations:
  1. Culvert gradient red
  2. Road Fill (pushed off road by grader)

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelClay (legacy)
Subdominant:Silt/ClayGravel
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)
Road Elev 100.00
D/S Tailcrest or 1st Thalweg (DRY) 0.00 93.58
Max Pool Depth 7.00 92.52
Outlet Pool Water Elev 7.00 93.54
D/S Water Surface Elev 10.00 93.54
Outlet Invert 10.00 92.57
Outlet Culvert Top 10.00 94.47
Inlet Culvert Top 79.40 95.95
Inlet Culvert Invert (DRY) 79.40 93.93
U/S Headwater 80.00 93.90
U/S Grade Ctrl (Thalweg) 83.00 93.91
U/S Water Surface Elev 83.00 93.95

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) Trap Duration(h): 30.0
Channel Type: Main Channel (>50% of water flow)
Comments: Small unidentified salmonids observed at inlet and outlet
 
Gear Type: Visual Observation, Ground (B) Trap Duration(h): 30.0
Channel Type: Main Channel (>50% of water flow)

Fish Observations

No fish observations occurred during this survey.

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