Fish Passage Site 40601675

Coordinates (dec. deg.): 67.91261°, -149.81992°
Legal Description: F036N010W28
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-DAL15

Observers: Gillian O'Doherty, Ben Histand

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient gray
  2. Hydraulic flows exceeded capacity
  3. Compound gradient in pipe
  4. Culvert sagging in middle
  5. Inlet perch

Comments: Pond/lake u/s, Dietrich R d/s; flow strong and fairly fast through pipe; big drop at inlet makes water surface gradient much steeper than gradient of pipe. Pump @ inlet. Vis obs several fish u/s in pond - maybe char? ~6" long.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 81.6
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: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):4.9 4.9
Height(ft):5.2 5.0
Apron Length(ft):
Water Depth(ft): 1.89
Rustline Height(ft):2.0
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 0.97%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient gray
  2. Hydraulic flows exceeded capacity
  3. Compound gradient in pipe
  4. Culvert sagging in middle
  5. Inlet perch

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClayGravel
Subdominant:OrganicCobble
Stream Slope(deg.):
Stream Flow Stage:

No stream width data available.

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 100.05
D/S Grade Ctrl (Thalweg) (1st GP d/s - no TWC) 0.00 93.89
D/S Water Surface Elev 0.00 95.01
D/S Water Surface Elev (ws @ outlet, =TWS) 7.00 95.12
Outlet Invert (on pipe) 7.00 93.23
Outlet Culvert Top 7.00 98.34
Inlet Culvert Top 88.60 99.19
Inlet Culvert Invert 88.60 94.02
U/S Water Surface Elev (ws @ inlet) 88.60 95.48
U/S Headwater (flat water drops toward and into pipe) 89.00 95.63
U/S Thalweg (pond bed - pipe is set high) 89.60 93.82
U/S Water Surface Elev 95.00 95.74
U/S Thalweg 95.00 92.53

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: Vis obs several fish u/s in pond - maybe char? ~6" long.

Fish Observations

Species: general fish observation, no species information Life History: Not Recorded
Total Fish Observed: 4 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Upstream Visual Observation, Ground (4)  

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