Fish Passage Site 30303079

Coordinates (dec. deg.): 59.09062°, -158.56815°
Legal Description: S012S055W32
Region: Southwest
Road Name: New Landfill Road

Datum: NAD83
Quad Name / ITM: Dillingham A-7
AWC Stream #:
Stream Name: Wood River tributary

Elevation:

Site Comments: None

Survey Date: Sep 21, 2012

Survey SWA12-DIL17

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Outfall height red
  2. Culvert gradient red
  3. Culvert is poorly aligned

Comments: Stream flows over 5-foot apron at outlet and then free falls into outlet pool. Upstream and downstream differ quite a bit, culvert has backed up creek creating a wider, deeper channel with more sediment. Downstream stream is a small, constricted riffle with cobble substrate.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 60.5
Inlet Type: Flared Inlet
Outlet Type: Flared Inlet
Corrugation Depth(in.): 5.0
Corrugation Width(in.): 2.75
Condition Rating(1-5): 3
Approach Angle: 61.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):2.9 2.9
Height(ft):3.0 3.1
Apron Length(ft):5.0 5.0
Water Depth(ft): 0.43
Rustline Height(ft):0.6
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.87
Outfall Type: Free Fall In To Pool
Constriction Ratio: 1.76
Culvert Gradient: 3.26%
Max Slope:
Max Slope Length:
 

Comments: Outfall type coded in field as SF/F: smooth flow over apron/free fall.
  Culvert Observations:
  1. Outfall height red
  2. Culvert gradient red
  3. Culvert is poorly aligned

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClayCobble
Subdominant:OrganicGravel
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 1.20
Downstream ordinary high water 1.90
Downstream ordinary high water 2.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 98.32
D/S Grade Ctrl (Thalweg) (cannot go further because of brush and log jams) 0.00 86.81
D/S Water Surface Elev 0.00 87.92
D/S Water Surface Elev (tailwater surface) 3.00 87.88
Max Pool Depth 3.00 86.50
D/S Water Surface Elev 7.00 88.45
D/S Thalweg (end apron) 7.00 88.27
Outlet Invert (on pipe) 12.00 88.32
D/S Water Surface Elev 12.00 88.75
Outlet Culvert Top 12.00 91.38
Inlet Culvert Top 72.50 93.31
Inlet Culvert Invert (on pipe) 72.50 90.29
U/S Water Surface Elev 72.50 90.88
U/S Grade Ctrl (Thalweg) (creek bed just upsream of apron on mud) 77.50 89.92
U/S Water Surface Elev 77.50 90.98
U/S Grade Ctrl (Thalweg) 78.00 89.84
U/S Grade Ctrl (Thalweg) 83.50 89.19
U/S Water Surface Elev 83.50 90.95

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.

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