Fish Passage Site 10302171

Coordinates (dec. deg.): 58.40808°, -134.54712°
Legal Description: C040S066E17
Region: Southeast
Road Name: Glacier Spur Road

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

Elevation:

Site Comments: None

Survey Date: Jun 10, 2011

Survey SEA11-MGR03

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient red
  2. Constriction ratio red
  3. Beaver Activity
  4. Debris Flow
  5. Mechanical damage or joints parting

Comments: No traps were set as stream is already in AWC. Fish were observed downstream from culvert, likely a Dolly Varden. Inlet has extensive damage and is clogged with debris, looks like old beaver activity. Downstream has lots of pools and small barriers. If flow was not down to a trickle, habitat would likely be condusive for anadromous fish. Upstream looks like a beaver pond with extensive riparian flooding of the old stream channel.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 73.4
Inlet Type: Projecting
Outlet Type: Flared Inlet
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.5
Condition Rating(1-5): 1
Approach Angle:
Sedimentation At Inlet: Yes
Inlet Substrate: Organic
Outlet Substrate: Organic
InletOutlet
Width(ft):1.3 2.8
Height(ft):1.5 2.7
Apron Length(ft): 5.0
Water Depth(ft): 0.75
Rustline Height(ft):1.2
Substrate Depth(ft):1.4 0.2
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.36
Culvert Gradient: 2.03%
Max Slope:
Max Slope Length:
 

Comments: Inlet damaged and plugged.
  Culvert Observations:
  1. Culvert gradient red
  2. Constriction ratio red
  3. Beaver Activity
  4. Debris Flow
  5. Mechanical damage or joints parting

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicOrganic
Subdominant:Silt/ClayGravel
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 31.0 6.50
Downstream ordinary high water 95.0 12.00
Downstream ordinary high water 140.0 4.90

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 99.02
Misc. (Survey point d/s) 0.00 91.47
D/S Water Surface Elev 0.00 91.68
D/S Grade Ctrl (Thalweg) 6.00 91.61
D/S Water Surface Elev 6.00 91.91
Max Pool Depth 18.00 90.63
Outlet Pool Water Elev 18.00 91.68
D/S Water Surface Elev 21.00 91.69
D/S Grade Ctrl (Thalweg) (End of apron at invert out on metal) 21.00 90.95
Outlet Culvert Top (On metal) 26.00 93.90
D/S Water Surface Elev (Invert out) 26.00 91.69
Outlet Thalweg (Invert out, on substrate) 26.00 90.94
Inlet Culvert Top (Mangled) 99.40 94.38
U/S Headwater (Invert in, 1st resting) 99.40 93.18
Inlet Thalweg (Invert in, on substrate, 1st resting) 99.40 92.73
U/S Water Surface Elev 102.40 93.16
U/S Thalweg 102.40 92.52

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)
Comments: Fish observed downstream from culvert, most likely dolly varden.

Fish Observations

No fish observations occurred during this survey.

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