Fish Passage Site 20502114

Coordinates (dec. deg.): 62.73495°, -149.72937°
Legal Description: S031N002W31
Region: South Central
Road Name: Alaska Railroad

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

Elevation:

Site Comments: Alaska Railroad site MP 264.48

Survey Date: Jun 17, 2011

Survey MSB11-ARR194

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. Outfall height red
  2. Compound gradient in pipe
  3. Mechanical damage or joints parting
  4. Sediment accumulation
  5. Subsidence
  6. Culvert gradient red

Comments: Alaska Railroad site MP 264.48. Wooden debris dam at inlet making up substrate material. Multiple joints of concrete culvert misaligned causing compound gradient in pipe. Upstream grade point used as zero point for this survey and distances move downstream.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Reinforced concrete) Fish Passage Rating: Red
 
Length(ft): 49.23
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.):
Corrugation Width(in.):
Condition Rating(1-5): 1
Approach Angle: 29.0
Sedimentation At Inlet: Yes
Inlet Substrate: Organic
Outlet Substrate: None
InletOutlet
Width(ft):3.96 3.96
Height(ft):3.72 4.32
Apron Length(ft):0.0 0.0
Water Depth(ft): 0.15
Rustline Height(ft):0.7
Substrate Depth(ft):0.66 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.45
Outfall Type: Free Fall In To Pool
Constriction Ratio: 1.67
Culvert Gradient: 7.10%
Max Slope:
Max Slope Length:
 

Comments: Used algae growth line for high water mark in culvert. Several joints of pipe misaligned creating compound gradient.
  Culvert Observations:
  1. Outfall height red
  2. Compound gradient in pipe
  3. Mechanical damage or joints parting
  4. Sediment accumulation
  5. Subsidence
  6. Culvert gradient red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicOrganic
Subdominant:Silt/ClaySilt/Clay
Stream Slope(deg.):
Stream Flow Stage:Low
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 25.0 2.60
Upstream ordinary high water 30.0 2.20
Upstream ordinary high water 36.0 2.30

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
U/S Grade Ctrl (Thalweg) (Top of glide) 0.00 90.01
U/S Water Surface Elev (Use for stream gradient) 0.00 90.15
U/S Water Surface Elev (Use for stream gradient) 18.00 89.99
U/S Grade Ctrl (Thalweg) (Top of glide) 18.00 89.81
Max Pool Depth (Upstream max pool, where three drainages intersect before the inlet.) 25.00 89.03
U/S Water Surface Elev (Water surface at upstream max pool.) 25.00 90.03
U/S Water Surface Elev (Water surface at inlet) 42.00 90.01
Inlet Culvert Invert (On wooden debris) 42.00 89.85
Road Elev (Middle of railroad tracks. No Top of pipes readings taken due to broken and cracked concrete.) 67.00 99.38
D/S Water Surface Elev (Water surface at outlet) 91.23 86.53
Outlet Thalweg (Substrate where water pools at outlet from outfall .) 91.23 85.42
Outlet Invert (On pipe) 91.23 85.91
D/S Water Surface Elev (Pool surface elevation created by outfall height onto cobble rip rap.) 91.23 86.08
D/S Water Surface Elev (Tail water surface) 101.23 86.10
D/S Tailcrest or 1st Thalweg (Tail water control) 101.23 86.00

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