Fish Passage Site 20502100

Coordinates (dec. deg.): 62.80787°, -149.65800°
Legal Description: S031N002W04
Region: South Central
Road Name: Alaska Railroad

Datum: NAD83
Quad Name / ITM: Talkeetna Mts D-6
AWC Stream #:
Stream Name: Unnamed

Elevation:

Site Comments: Alaska Railroad site at MP 267.3.

Survey Date: Jun 16, 2011

Survey MSB11-ARR202

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: John Greuey, Abraham Gioffre

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: Yes

Step Pools: No
Construction Year: 2004


Site Observations:

  1. Culvert gradient gray

Comments: Smooth glide through pipe although pipe is backwatered due to a cobble riffle tailwater control dwst causing water to pond and flow back. Upst channel is relatively flat. Long. Profile zero point is at upstream grade point for this survey and all points are downstream from it.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Gray
 
Length(ft): 49.9
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.25
Condition Rating(1-5): 3
Approach Angle: 80.0
Sedimentation At Inlet: No
Inlet Substrate: Cobble
Outlet Substrate: Cobble
InletOutlet
Width(ft):9.5 9.6
Height(ft):6.4 6.3
Apron Length(ft):0.0 0.0
Water Depth(ft): 1.88
Rustline Height(ft):2.0
Substrate Depth(ft):3.3 3.3
Backwatered?: Yes
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 3.3
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.07
Culvert Gradient: 3.75%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient gray

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelCobble
Subdominant:CobbleGravel
Stream Slope(deg.):0.3
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 100.0 9.20
Upstream ordinary high water 130.0 8.60
Upstream ordinary high water 160.0 9.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
U/S Grade Ctrl (Thalweg) (Top of riffle) 0.00 91.03
U/S Water Surface Elev 0.00 91.47
U/S Water Surface Elev (Water surface at inlet) 100.00 91.18
Inlet Culvert Invert (On substrate) 100.00 88.77
Inlet Culvert Top 100.00 97.57
Road Elev (Center of railroad tracks) 125.00 99.84
Outlet Invert (On substrate) 149.90 89.30
D/S Water Surface Elev (Water surface at outlet) 149.90 91.18
Outlet Culvert Top 149.90 95.70
D/S Tailcrest or 1st Thalweg (Taill water control.Top of riffle) 159.90 90.70
D/S Water Surface Elev (Tail water surface) 159.90 91.14

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