Fish Passage Site 20502109

Coordinates (dec. deg.): 62.78010°, -149.69373°
Legal Description: S031N002W17
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 264.96.

Survey Date: Jun 17, 2011

Survey MSB11-ARR199

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient red
  2. Mechanical damage or joints parting
  3. Sediment accumulation
  4. Culvert sagging in middle
  5. Structural Problem
  6. Constriction ratio gray

Comments: Alaska Railroad site at MP 264.96. Inlet and outlet edge of pipes did have an old piece of RR tie used to construct a partial headwall. Old headwall was mostly decomposed. Both upst and dwst areas for about 100' had been disturbed with heavy machinery so natural channel widths could not be taken but far upst. Long. Profile zero point is at upstream grade point for this survey. All points move downstream.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Structural steel plate) Fish Passage Rating: Red
 
Length(ft): 120.37
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.25
Corrugation Width(in.): 6.0
Condition Rating(1-5): 2
Approach Angle: 51.0
Sedimentation At Inlet: Yes
Inlet Substrate: Cobble
Outlet Substrate: Cobble
InletOutlet
Width(ft):6.2 6.2
Height(ft):4.5 6.16
Apron Length(ft):0.0 0.0
Water Depth(ft): 0.51
Rustline Height(ft):3.0
Substrate Depth(ft):1.55 0.25
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.53
Culvert Gradient: 3.29%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient red
  2. Mechanical damage or joints parting
  3. Sediment accumulation
  4. Culvert sagging in middle
  5. Structural Problem

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleGravel
Subdominant:GravelCobble
Stream Slope(deg.):5.1
Stream Flow Stage:Low
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 206.0 10.50
Upstream ordinary high water 252.0 10.00
Upstream ordinary high water 282.0 14.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
U/S Grade Ctrl (Thalweg) (Top of continuous riffle) 0.00 100.83
U/S Water Surface Elev (Use for stream gradient) 0.00 101.14
U/S Grade Ctrl (Thalweg) (Top of step in continuous riffle) 50.00 98.38
U/S Water Surface Elev 50.00 98.65
U/S Grade Ctrl (Thalweg) (Top of step in continuous riffle) 122.00 94.69
U/S Water Surface Elev (Use for stream gradient) 122.00 94.87
Inlet Culvert Invert (On substrate) 194.00 89.47
U/S Water Surface Elev (Water surface at inlet) 194.00 89.57
Inlet Culvert Top 194.00 94.00
Road Elev (Center of railroad tracks) 254.00 120.47
Outlet Culvert Top 313.48 90.04
Outlet Invert (On substrate) 313.48 83.72
D/S Water Surface Elev (Water surface at outlet) 313.48 84.23
D/S Grade Ctrl (Thalweg) (Bottom of riffle) 343.48 82.91
D/S Water Surface Elev 343.48 83.08

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