Fish Passage Site 20502124

Coordinates (dec. deg.): 62.65964°, -149.92154°
Legal Description: S030N003W30
Region: South Central
Road Name: Alaska Railroad

Datum: NAD83
Quad Name / ITM: Talkeetna Mts C-6
AWC Stream #:
Stream Name: Susitna River tributary

Elevation:

Site Comments: RR MP 252.9

Survey Date: Jun 20, 2011

Survey MSB11-ARR90

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:


Comments: Alaska Railroad site at MP 252.9. Direct trib to Susitna R with confluence approx 10' dwst. Culvert is backwatered from the river and upst area is a lowland bog. Profile started upstream.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Reinforced concrete) Fish Passage Rating: Green
 
Length(ft): 41.0
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.):
Corrugation Width(in.):
Condition Rating(1-5): 3
Approach Angle: 75.0
Sedimentation At Inlet: Yes
Inlet Substrate: Silt/Clay
Outlet Substrate: Silt/Clay
InletOutlet
Width(ft):3.7 3.7
Height(ft):3.35 2.45
Apron Length(ft):0.0 0.0
Water Depth(ft): 1.2
Rustline Height(ft):0.0
Substrate Depth(ft):0.4 1.35
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.32
Culvert Gradient: 0.07%
Max Slope:
Max Slope Length:

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClaySilt/Clay
Subdominant:OrganicOrganic
Stream Slope(deg.):0.05
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 20.0 8.50
Upstream ordinary high water 50.0 13.00
Upstream ordinary high water 80.0 12.70

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
U/S Grade Ctrl (Thalweg) (Silt substrate of poos) 0.00 89.12
U/S Water Surface Elev 0.00 90.82
Inlet Culvert Invert (On silt substrate) 40.00 88.66
U/S Water Surface Elev (Water surface at inlet) 40.00 90.80
Inlet Culvert Top 40.00 92.08
Road Elev (Middle of railroad tracks) 60.00 99.40
D/S Water Surface Elev (Water surface at outlet) 81.00 90.82
Outlet Culvert Top (Used Inside of top of pipe due to corrosion on top of pipe) 81.00 92.05
Outlet Invert 81.00 89.62
D/S Tailcrest or 1st Thalweg (Tail water control is silt substrate near large boulder) 84.00 90.00
D/S Water Surface Elev (Tail water surface) 84.00 90.79

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