Fish Passage Site 10302191

Coordinates (dec. deg.): 58.41699°, -134.59096°
Legal Description: C040S066E07
Region: Southeast
Road Name: Skater Cabin Road

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

Elevation:

Site Comments: None

Survey Date: Jun 24, 2011

Survey SEA11-SCR01

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

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: Yes

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient gray
  2. Constriction ratio gray

Comments: Unidentified juvenile salmonids observed upstream and downstream from culvert. Stream empties out directy into Mendenhall Lake. Creek becomes trickle about 40 feet upstream from culvert, but fry observed throughout upstream pools. Stream size consistant though must of observed length.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 45.6
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 3
Approach Angle: 53.0
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):3.9 3.9
Height(ft):3.6 3.6
Apron Length(ft):
Water Depth(ft): 0.76
Rustline Height(ft):1.45
Substrate Depth(ft):0.3 0.3
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.66
Culvert Gradient: 0.85%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient gray
  2. Constriction ratio gray

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:CobbleSand
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 28.0 5.40
Upstream ordinary high water 47.0 5.60
Upstream ordinary high water 76.0 6.70

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev (TBM) 100.00
D/S Thalweg (Profile or survey point, lake shore) 0.00 94.22
D/S Water Surface Elev 0.00 94.79
Outlet Culvert Top (Invert out, on metal) 7.00 97.64
Outlet Thalweg (Invert out, on substrate) 7.00 94.01
D/S Water Surface Elev (Invert out) 7.00 94.77
U/S Headwater (Invert in, 1st resting) 52.60 94.75
Inlet Thalweg (Invert in, on substrate) 52.60 94.45
Inlet Culvert Top (Invert in, on metal) 52.60 98.03
U/S Water Surface Elev 59.50 94.79
U/S Thalweg 59.50 94.60

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): 10.0
Channel Type: Main Channel (>50% of water flow)
Comments: Visual observation of unidentified juvenile salmonids upstream and downstream from culvert.
 
Gear Type: Visual Observation, Ground (B) Trap Duration(h): 10.0
Channel Type: Main Channel (>50% of water flow)
Comments: Visual observation

Fish Observations

Species: juvenile salmonid-unspecified Life History: Unknown
Total Fish Observed: 6 Fish Measured: 0 Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Downstream Visual Observation, Ground (0)  Upstream Visual Observation, Ground (6)  

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