Fish Passage Site 40601672

Coordinates (dec. deg.): 68.03592°, -149.65388°
Legal Description: U016S011E20
Region: Interior
Road Name: Dalton Highway

Datum: NAD83
Quad Name / ITM: Philip Smith Mts A-5
AWC Stream #:
Stream Name: Dietrich River tributary

Elevation:

Site Comments: Mile 235.6 Dalton Highway; trib to Dietrich River, DOT# 817+50

Survey Date: Aug 20, 2010

Survey EDS10-DAL12

Observers: Gillian O'Doherty, Ben Histand

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient red
  2. Constriction ratio gray
  3. Mechanical damage or joints parting

Comments: Inlet bent; pipe appears to have been embedded at first; now it is not. No substrate at inlet. There is still bedload in lower part of pipe. Mile 235.6 Dalton Highway; trib to Dietrich River

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Red
 
Length(ft): 123.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 2
Approach Angle: 18.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: Gravel
InletOutlet
Width(ft):7.9 8.2
Height(ft):5.6 4.8
Apron Length(ft):
Water Depth(ft): 0.9
Rustline Height(ft):1.1
Substrate Depth(ft):0.0 1.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.73
Culvert Gradient: 6.96%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient red
  2. Constriction ratio gray
  3. Mechanical damage or joints parting

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:CobbleCobble
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 61.0 13.00
Upstream ordinary high water 126.0 10.00
Upstream ordinary high water 207.0 9.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 100.97
D/S Grade Ctrl (Thalweg) (1st GP d/s; steep, not TWC - no outlet pool) 0.00 85.28
D/S Water Surface Elev 0.00 86.00
D/S Water Surface Elev (TWS - calm water surface) 6.50 86.14
D/S Water Surface Elev (ws @ outlet; turbulent) 7.50 86.21
Outlet Culvert Top 7.50 90.22
Outlet Invert (on subs) 7.50 85.31
Inlet Culvert Top (top of inlet) 131.00 98.81
Inlet Culvert Invert (no subs) 131.00 93.05
U/S Water Surface Elev (turbulent) 131.00 93.54
U/S Headwater (right outside inlet) 132.00 93.56

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

No fish sampling occurred during this survey.

Fish Observations

No fish observations occurred during this survey.

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