Fish Passage Site 20502083

Coordinates (dec. deg.): 62.85552°, -149.62180°
Legal Description: S032N002W22
Region: South Central
Road Name: Alaska Railroad

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

Elevation:

Site Comments: Alaska Railroad at MP 271.3.

Survey Date: Jun 15, 2011

Survey MSB11-ARR209

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. Outfall height red
  3. Constriction ratio gray
  4. Beaver Activity
  5. Structural Problem
  6. Woody Debris

Comments: Alaska Railroad at MP 271.3. Beaver dam constructed in inlet w/ a depth of .90'. Inlet of culvert crushed to an oval shape and top of outlet crushed also. Beaver dam at inlet made meauring rust line difficult. A noticeable rust line at the outlet did measure 2.45'.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 50.12
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.5
Condition Rating(1-5): 2
Approach Angle: 56.0
Sedimentation At Inlet: Yes
Inlet Substrate: Organic
Outlet Substrate: None
InletOutlet
Width(ft):4.1 3.9
Height(ft):2.78 3.95
Apron Length(ft):0.0 0.0
Water Depth(ft): 0.33
Rustline Height(ft):0.9
Substrate Depth(ft):0.9 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.41
Outfall Type: Free Fall In To Pool
Constriction Ratio: 0.65
Culvert Gradient: 2.25%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient red
  2. Outfall height red
  3. Constriction ratio gray
  4. Beaver Activity
  5. Structural Problem
  6. Woody Debris

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelCobble
Subdominant:Silt/ClayGravel
Stream Slope(deg.):1.4
Stream Flow Stage:Low
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 24.0 6.25
Downstream ordinary high water 34.0 6.00
Downstream ordinary high water 50.0 5.70

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Grade Ctrl (Thalweg) (Top of riffle) 0.00 89.98
D/S Water Surface Elev 0.00 90.16
D/S Grade Ctrl (Thalweg) 42.00 90.45
D/S Water Surface Elev 42.00 90.73
Outlet Pool Water Elev (Used for outfall height calculation) 52.00 90.89
Max Pool Depth (Outlet pool max depth) 52.00 89.91
Outlet Culvert Top 56.00 95.03
Outlet Invert 56.00 90.97
D/S Water Surface Elev (Water surface at outlet) 56.00 91.30
Road Elev (Center of railroad tracks) 81.00 99.42
Inlet Culvert Top 106.12 96.16
Inlet Culvert Invert (Reading taken on top of wooden beaver dam debris) 106.12 93.20
U/S Water Surface Elev (Water surface at inlet. Ponded due to beaver activity) 106.12 93.99

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