Fish Passage Site 10302239

Coordinates (dec. deg.): 58.65012°, -134.92123°
Legal Description: C037S064E19
Region: Southeast
Road Name: Glacier Highway

Datum: NAD83
Quad Name / ITM: Juneau C-3
AWC Stream #: 115-20-10620-2004-3015
Stream Name: Cowee Creek tributary

Elevation:

Site Comments: None

Survey Date: Jun 20, 2011

Survey SEA11-GLH01

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. Woody Debris
  2. Beaver Activity

Comments: Pipe is completely plugged with debris from beaver activity. Upstream is impounded and has a fence structure used unsuccessfully to deter beavers, it is smashed down with mud and is now being used as a beaver slide and entrance pool to his den (the clogged culvert.) Stream is also impounded downstream with multiple beaver dams seperating muskeg/pool systems. Fish were observed both upstream and downstream of culvert with additional juvenile coho seen feeding on bits of roe from outside the downstream trap upon removal. Pipe appears to be a 4 foot corrugated plastic pipe but exact measurements were hindered by beaver activity. Muck layers downstream were not very deep with what feels like gravel not far below sediment suggesting quality habitat before impoundment in old stream channel. Water differential elevation between upstream and downstream ends measured at 2.65 feet.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated plastic) Fish Passage Rating: Red
 
Length(ft): 99.0
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 3.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 1
Approach Angle:
Sedimentation At Inlet: Yes
Inlet Substrate: Organic
Outlet Substrate: Organic
InletOutlet
Width(ft): 3.8
Height(ft): 1.8
Apron Length(ft):
Water Depth(ft):
Rustline Height(ft):
Substrate Depth(ft): 2.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 0.85%
Max Slope:
Max Slope Length:
 

Comments: Many points are unknown or not-applicable because of beaver activity and ponding of upstream and downstream habitat.
  Culvert Observations:
  1. Woody Debris
  2. Beaver Activity

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicOrganic
Subdominant:Silt/ClaySilt/Clay
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 100.22
D/S Tailcrest or 1st Thalweg (Stagnant pool) 0.00 89.19
D/S Water Surface Elev 0.00 89.79
Outlet Culvert Top (Invert out, on plastic) 5.00 93.38
Inlet Culvert Top (Invert In, on plastic) 104.00 94.22
U/S Grade Ctrl (Thalweg) (Pool substrate, beaver pond) 113.00 91.70
U/S Headwater (Beaver pond) 113.00 92.44

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, other juvenile coho seen outside of trap
 
Gear Type: Minnow Trap (B) Trap Duration(h): 1.0
Channel Type: Main Channel (>50% of water flow)
Comments: Trap placed at 15 feet downstream of invert out

Fish Observations

Species: juvenile coho salmon Life History: Anadromous
Total Fish Observed: 1 Fish Measured: 1 Fork Lengths (mm) Min: 7 Max: 7 Mean: 7
Collected/Observed by Gear Type: Downstream Minnow Trap (1)  

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