Fish Passage Site 30303069

Coordinates (dec. deg.): 59.16842°, -158.65800°
Legal Description: S012S056W02
Region: Southwest
Road Name: Aleknagik Lake Road

Datum: NAD83
Quad Name / ITM: Dillingham A-8
AWC Stream #:
Stream Name: Belt Creek tributary

Elevation:

Site Comments: None

Survey Date: Sep 19, 2012

Survey SWA12-DIL07

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: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert is poorly aligned

Comments: Substrate not continuous through pipe. Large pipe. Sediment and road gravels at outlet caught by broken thaw pipe. Culvert close to embedded. Inlet slightly damaged and gradient close to green.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Green
 
Length(ft): 50.9
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 3
Approach Angle: 46.0
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):6.8 6.9
Height(ft):4.0 4.5
Apron Length(ft):
Water Depth(ft): 0.57
Rustline Height(ft):1.4
Substrate Depth(ft):0.5 1.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.48
Culvert Gradient: 1.06%
Max Slope:
Max Slope Length:
 

Comments: Gradient 1.02 is technically gray. Field rating green. Top of miter length is 39.5 feet.

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:CobbleCobble
Stream Slope(deg.):1.25
Stream Flow Stage:High
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 45.0 3.90
Upstream ordinary high water 74.0 4.80
Upstream ordinary high water 112.0 5.10

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 100.00
D/S Grade Ctrl (Thalweg) (little falls) 0.00 90.86
D/S Water Surface Elev 0.00 91.42
D/S Grade Ctrl (Thalweg) (channel heads right from outlet area) 41.00 91.19
D/S Water Surface Elev 41.00 92.04
D/S Water Surface Elev 47.00 92.09
Outlet Invert (on substrate) 47.00 91.52
Outlet Culvert Top 53.00 95.81
Inlet Culvert Top (damaged a bit) 92.50 96.23
Inlet Culvert Invert (on substrate) 98.50 91.38
U/S Water Surface Elev 98.50 92.56
U/S Water Surface Elev 143.50 92.75
U/S Grade Ctrl (Thalweg) 143.50 91.79
U/S Grade Ctrl (Thalweg) 198.50 92.77
U/S Water Surface Elev 198.50 93.44

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)
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