Fish Passage Site 40601676

Coordinates (dec. deg.): 67.84410°, -149.81688°
Legal Description: F035N010W21
Region: Interior
Road Name: Dalton Highway

Datum: NAD83
Quad Name / ITM: Chandalar D-6
AWC Stream #:
Stream Name: Dietrich River tributary

Elevation:

Site Comments: None

Survey Date: Aug 21, 2010

Survey EDS10-DAL16

Observers: Gillian O'Doherty, Ben Histand

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Compound gradient in pipe
  2. Other, including vibrations, cavitation, etc.
  3. Hydraulic flows exceeded capacity
  4. Outfall height red

Comments: only pipe 3 has flow; large outfall over last baffle in pipe

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 60.4
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.25
Corrugation Width(in.): 3.0
Condition Rating(1-5): 5
Approach Angle:
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):4.0 4.0
Height(ft):4.0 4.0
Apron Length(ft):
Water Depth(ft):
Rustline Height(ft):0.0
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: Yes
Embedded?: No
Outfall Height:
Outfall Type: Overflow Pipe
Constriction Ratio:
Culvert Gradient: 4.19%
Max Slope:
Max Slope Length:
 

Comments: pipe 1 is dry overflow pipe
ID: 2 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 81.4
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5): 2
Approach Angle: 15.0
Sedimentation At Inlet: Yes
Inlet Substrate: Cobble
Outlet Substrate: None
InletOutlet
Width(ft):10.0 10.0
Height(ft):4.2 10.0
Apron Length(ft):
Water Depth(ft):
Rustline Height(ft):0.0
Substrate Depth(ft):5.8 0.0
Backwatered?: No
Baffles Present: Yes
Embedded?: No
Outfall Height:
Outfall Type: Fish Passage Structue
Constriction Ratio:
Culvert Gradient: 1.04%
Max Slope:
Max Slope Length:
 

Comments: pipe 2 is dry. Outlet nearly rusted through and severely abraded
  Culvert Observations:
  1. Other, including vibrations, cavitation, etc.
ID: 3 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 81.4
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5): 2
Approach Angle: 15.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):10.0 10.0
Height(ft):6.4 10.0
Apron Length(ft):
Water Depth(ft):
Rustline Height(ft):0.0
Substrate Depth(ft):3.6 0.0
Backwatered?: No
Baffles Present: Yes
Embedded?: No
Outfall Height: 3.5
Outfall Type: Fish Passage Structue
Constriction Ratio:
Culvert Gradient: 1.07%
Max Slope:
Max Slope Length:
 

Comments: outfall height is estimated from site photos. Freefall over last baffle. Outlet nearly rusted through and severely abraded
  Culvert Observations:
  1. Outfall height red
  2. Compound gradient in pipe
  3. Other, including vibrations, cavitation, etc.
  4. Hydraulic flows exceeded capacity

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleCobble
Subdominant:GravelGravel
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 100.25
Outlet Culvert Top 1 0.00 95.42
Outlet Culvert Top 2 0.00 96.55
Outlet Culvert Top 3 0.00 96.65
Inlet Culvert Top 1 60.40 97.95
Inlet Culvert Top 2 81.40 97.40
Inlet Culvert Top 3 81.40 97.52

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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