Fish Passage Site 40601680

Coordinates (dec. deg.): 67.69763°, -149.73335°
Legal Description: F033N010W11
Region: Interior
Road Name: Dalton Highway

Datum: NAD83
Quad Name / ITM: Chandalar C-6
AWC Stream #:
Stream Name: Disaster Creek

Elevation:

Site Comments: Crosses TAPSat P/L MP 201.43

Survey Date: Aug 23, 2010

Survey EDS10-DAL20

Observers: Gillian O'Doherty, Ben Histand

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert is too short
  2. Hydraulic flows exceeded capacity
  3. Outfall height gray
  4. Structural Problem
  5. Compound gradient in pipe
  6. Culvert gradient red

Comments: Outlet damaged and rip-rap collapsing into scour hole; lots of metal in stream @ outlet, maybe old sections of culvert; lower half culvert collapsing and steeper than overall gradient. Sculpin & grayling recorded in creek by TAPS.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Red
 
Length(ft): 61.2
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 2
Approach Angle: 10.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):9.5 9.7
Height(ft):6.5 6.7
Apron Length(ft):
Water Depth(ft): 0.56
Rustline Height(ft):1.5
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.31
Outfall Type: Free Fall In To Pool
Constriction Ratio:
Culvert Gradient: 5.64%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert is too short
  2. Hydraulic flows exceeded capacity
  3. Outfall height gray
  4. Structural Problem
  5. Compound gradient in pipe
  6. Culvert gradient red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleCobble
Subdominant:SandGravel
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 99.84
D/S Water Surface Elev 0.00 87.92
D/S Tailcrest or 1st Thalweg 0.00 87.18
Max Pool Depth 15.00 85.95
Outlet Pool Water Elev ((TWS)) 18.00 87.96
D/S Water Surface Elev (ws @ outlet) 21.00 88.27
Outlet Invert (metal at outlet is broken, bent lower) 21.00 87.71
Outlet Culvert Top 21.00 94.27
Inlet Culvert Top 82.20 97.72
Inlet Culvert Invert 82.20 91.17
U/S Water Surface Elev 82.20 91.97
U/S Headwater (above big inlet perch) 84.00 92.27

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.

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