Fish Passage Site 10302240

Coordinates (dec. deg.): 58.61877°, -134.93423°
Legal Description: C037S063E36
Region: Southeast
Road Name: Glacier Highway

Datum: NAD83
Quad Name / ITM: Juneau C-3
AWC Stream #:
Stream Name: Bridget Cove tributary

Elevation:

Site Comments: Site is between MP 36-37.

Survey Date: Jun 21, 2011

Survey SEA11-GLH02

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. Outfall height red
  3. Culvert is poorly aligned

Comments: Juvenile salmonids observed just upstream of culvert. Header under both pipes. Pipe 1 dry. Juvenile salmonids observed downstream. Nice salmonid habitat upstream and downstream. Many fry/fingerlings observed in pool/riffle complexes. Bear activity in area. Nearly right angle of stream at inlet with current stream banks. Unable to collect sufficient points upstream for a stream gradient estimation.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 77.3
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5): 3
Approach Angle: 85.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):7.0 7.0
Height(ft):5.0 5.0
Apron Length(ft):
Water Depth(ft):0.0 0.0
Rustline Height(ft):1.0
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.38
Outfall Type: Free Fall In To Pool
Constriction Ratio: 0.98
Culvert Gradient: 2.82%
Max Slope:
Max Slope Length:
 

Comments: Multiple pipe system constriction ratio used. Culvert dry all flow through C2.
  Culvert Observations:
  1. Culvert gradient red
  2. Outfall height red
  3. Culvert is poorly aligned
ID: 2 Structure Type: Pipe-arch (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 77.2
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5): 3
Approach Angle: 85.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):7.0 7.0
Height(ft):5.0 5.0
Apron Length(ft):
Water Depth(ft):0.0 0.13
Rustline Height(ft):1.0
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.65
Outfall Type: Free Fall In To Pool
Constriction Ratio: 0.98
Culvert Gradient: 2.94%
Max Slope:
Max Slope Length:
 

Comments: Multiple pipe constriction ratio calculation used.
  Culvert Observations:
  1. Culvert gradient red
  2. Outfall height red
  3. Culvert is poorly aligned

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:SandCobble
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 105.0 10.60
Upstream ordinary high water 150.0 8.50
Upstream ordinary high water 300.0 11.30

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 100.18
D/S Water Surface Elev 0.00 87.43
D/S Grade Ctrl (Thalweg) 0.00 87.19
D/S Tailcrest or 1st Thalweg (Pipe #2) 2 45.00 87.69
D/S Water Surface Elev (Pipe #2) 2 45.00 88.16
Outlet Pool Water Elev (Pipe #1) 1 53.00 88.18
Max Pool Depth (Pipe #2) 2 53.00 86.98
D/S Tailcrest or 1st Thalweg (Pipe #1) 1 54.00 88.26
Outlet Pool Water Elev (Pipe #1) 1 55.00 88.40
Max Pool Depth (Pipe #1) 1 55.00 87.29
Outlet Invert (Pipe #2) 2 57.00 88.70
Outlet Invert (Pipe #1) 1 57.00 88.78
D/S Water Surface Elev (Pipe #2 invert out) 2 57.00 88.83
Outlet Culvert Top (Pipe #2) 2 57.00 93.86
Outlet Culvert Top (Pipe #1) 1 57.00 93.93
Inlet Culvert Top (Pipe #2) 2 134.20 96.15
Inlet Culvert Invert (Pipe 2, BOP on metal) 2 134.20 90.97
U/S Water Surface Elev (Pipe 2 Invert in) 2 134.20 91.17
U/S Water Surface Elev (Pipe 1 invert in) 1 134.30 91.01
Inlet Culvert Invert (Pipe 1 BOP on metal) 1 134.30 90.96
Inlet Culvert Top (Pipe #1) 1 134.30 96.09
U/S Headwater (Pipe 1) 1 135.30 90.98
U/S Headwater (Pipe 2) 2 136.20 91.17

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
Comments: Juvenile coho obsvered upstream and downstream of culvert.

Fish Observations

No fish observations occurred during this survey.

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