Fish Passage Site 20502120

Coordinates (dec. deg.): 61.63170°, -149.83406°
Legal Description: S018N003W21
Region: South Central
Road Name: Parks Highway

Datum: NAD83
Quad Name / ITM: Anchorage C-8
AWC Stream #:
Stream Name: Susitna River tributary

Elevation:

Site Comments: None

Survey Date: Aug 17, 2011

Survey MSB11-PRK08

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. Culvert gradient red

Comments: Small compound gradient noticed in middle of pipe which serves a small headwater stream with a narrow stream channel with several woody debris cascades upstream.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 115.0
Inlet Type: Flared Inlet
Outlet Type: Flared Inlet
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 3
Approach Angle: 20.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):2.95 2.95
Height(ft):2.95 2.95
Apron Length(ft):4.65 4.65
Water Depth(ft): 0.18
Rustline Height(ft):0.6
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.44
Outfall Type: Smooth Flow Over Apron
Constriction Ratio: 0.64
Culvert Gradient: 1.50%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Outfall height red
  2. Compound gradient in pipe
  3. Culvert gradient red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:SandSand
Stream Slope(deg.):4.6
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 20.0 4.80
Upstream ordinary high water 40.0 4.95
Upstream ordinary high water 75.0 4.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Grade Ctrl (Thalweg) (Bottom of riffle) 0.00 84.33
D/S Water Surface Elev 0.00 84.95
D/S Tailcrest or 1st Thalweg (Tail water control) 16.00 85.16
D/S Water Surface Elev (Tail water surface) 16.00 85.51
Misc. (Invert at end of outlet apron. On pipe) 24.00 85.91
D/S Water Surface Elev (Water surface at outlet apron) 24.00 85.95
Outlet Invert (On pipe) 28.65 86.11
D/S Water Surface Elev (Water surface at outlet invert) 28.65 86.29
Outlet Culvert Top 28.65 89.08
Road Elev 86.00 100.00
Inlet Culvert Top 143.65 90.80
Inlet Culvert Invert (On pipe) 143.65 87.80
U/S Water Surface Elev (Water surface at inlet invert) 143.65 88.11
U/S Water Surface Elev (Water surface at inlet apron) 148.30 88.11
Misc. (Invert at end of inlet apron. On pipe) 148.30 87.96
U/S Water Surface Elev 156.30 88.22
Max Pool Depth (Max pool depth upstream of inlet) 156.30 87.69
U/S Water Surface Elev (Used for stream gradient. Three resting pools not present, continuous riffle.) 175.30 88.41
U/S Water Surface Elev (Used for stream gradient. Three resting pools not present, continuous riffle) 263.30 92.42

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