Fish Passage Site 60401662

Coordinates (dec. deg.): 70.15385°, -148.45909°
Legal Description: U009N014E12
Region: Arctic
Road Name: Dalton Highway

Datum: NAD83
Quad Name / ITM: Beechey Point A-3
AWC Stream #:
Stream Name: Sagavanirktok River tributary

Elevation:

Site Comments: DOT# 3040+02

Survey Date: Aug 06, 2010

Survey EDS10-DAL02

Observers: Mark Eisenman, Justin Leon

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Compound gradient in pipe
  2. Outfall height red
  3. Culvert gradient red
  4. Damage associated with ice problems
  5. Culvert sagging in middle

Comments: There is a big outlet pool at this culvert and there is a large outfall height. There is a large amount of erosion at the inlet and outlet of this culvert. The inlet appears to have a slight amount of ice damage and is bent in. There are boulders piled near the inlet.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Red
 
Length(ft): 73.8
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 2
Approach Angle: 0.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):11.2 11.0
Height(ft):7.1 7.2
Apron Length(ft):
Water Depth(ft): 0.13
Rustline Height(ft):2.8
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 1.62
Outfall Type: Free Fall In To Pool
Constriction Ratio: 0.7
Culvert Gradient: -0.18%
Max Slope: 2.96
Max Slope Length: 25.0
  Culvert Observations:
  1. Compound gradient in pipe
  2. Outfall height red
  3. Culvert gradient red
  4. Damage associated with ice problems
  5. Culvert sagging in middle

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 198.0 11.60
Upstream ordinary high water 221.0 4.90
Upstream ordinary high water 245.0 6.70

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev (Road Surface) 108.17
D/S Grade Ctrl (Thalweg) (Thalweg) 0.00 96.26
D/S Water Surface Elev (Water Surface) 0.00 96.51
D/S Tailcrest or 1st Thalweg (Thalweg) 272.00 96.55
D/S Water Surface Elev (Water Surface) 272.00 96.83
D/S Water Surface Elev (Tailwater Surface - Pool Surface - Max Depth is >5.5') 324.00 96.85
Outlet Culvert Top (Top of Pipe) 325.00 105.91
Outlet Invert (Bottom of Pipe) 325.00 98.34
D/S Water Surface Elev (Water Surface) 325.00 98.47
Misc. (Drop to Substrate Off End of Pipe) 325.00 94.69
Misc. (Max Gradient - Substrate) 350.00 99.08
Misc. (Max Gradient - Substrate) 350.00 99.33
U/S Water Surface Elev (Water Surface = Headwater Surface) 398.80 99.36
Inlet Culvert Invert (Bottom of Pipe) 398.80 98.20
Inlet Culvert Top (Top of Pipe) 398.80 105.47
U/S Thalweg (Substrate) 428.80 99.00
U/S Water Surface Elev (Water Surface) 428.80 99.37

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: Minnow Trap (A) Trap Duration(h): 1.5
Channel Type: Main Channel (>50% of water flow)
Comments: Nothing was caught.
 
Gear Type: Minnow Trap (B) Trap Duration(h): 1.5
Channel Type: Main Channel (>50% of water flow)
Comments: 10 nine-spine sticklebacks were caught.

Fish Observations

Species: no fish collected or observed Life History: Not Applicable
Total Fish Observed: 0 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Upstream Minnow Trap (0)  
 
Species: ninespine stickleback Life History: Unknown
Total Fish Observed: 10 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Downstream Minnow Trap (10)  

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