Fish Passage Site 30303082

Coordinates (dec. deg.): 59.02452°, -158.53804°
Legal Description: S013S056W25
Region: Southwest
Road Name: Kanakanak Road

Datum: NAD83
Quad Name / ITM: Dillingham A-7
AWC Stream #: 325-30-10100-2017
Stream Name: Nushagak River tributary

Elevation:

Site Comments: None

Multiple surveys have been conducted at this site — click on the drop down
arrow to the right of the survey date below to choose a different report for this site.

Survey SWA12-DIL20

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

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: Yes

Step Pools: No
Construction Year:


Site Observations:

  1. Compound gradient in pipe
  2. Beaver Activity
  3. Hydraulic flows exceeded capacity
  4. Structural Problem
  5. Culvert is too short
  6. Culvert is poorly aligned

Comments: Old beaver dam upstream and downstream. Large outlet pool with debris dam serving as TWC. Upstream comes in from multiple channels. Unable to get culvert length. Culvert sagging in middle, unable to see through because almost completely filled with water.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft):
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5): 2
Approach Angle: 90.0
Sedimentation At Inlet: Yes
Inlet Substrate: Cobble
Outlet Substrate: Cobble
InletOutlet
Width(ft):5.0 5.0
Height(ft):4.1 4.4
Apron Length(ft):
Water Depth(ft):
Rustline Height(ft):
Substrate Depth(ft):0.9 0.6
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Outfall Height:
Outfall Type: At Stream Grade
Constriction Ratio: 0.83
Culvert Gradient:
Max Slope:
Max Slope Length:
 

Comments: Failure code Road Fill not entered because of lack of space. Unable to shoot length because culvert nearly full of water. No rust line height.
  Culvert Observations:
  1. Compound gradient in pipe
  2. Beaver Activity
  3. Hydraulic flows exceeded capacity
  4. Structural Problem
  5. Culvert is too short
  6. Culvert is poorly aligned

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClayGravel
Subdominant:OrganicSilt/Clay
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 57.0 6.40
Upstream ordinary high water 124.0 6.00
Upstream ordinary high water 158.0 5.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Water Surface Elev (pool above twc) 89.56
U/S Water Surface Elev 90.44
D/S Water Surface Elev 90.45

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: No traps set, no fish observed.

Fish Observations

No fish observations occurred during this survey.

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