Fish Passage Site 20501426

Coordinates (dec. deg.): 61.89577°, -150.07790°
Legal Description: S021N004W19
Region: South Central
Road Name: PARKS Highway

Datum: NAD83
Quad Name / ITM: Tyonek D-1
AWC Stream #: 247-41-10200-2170-3006
Stream Name: Grey's Creek

Elevation:

Site Comments: SUSITNA RIVER WATERSHED

Multiple surveys have been conducted at this site — click on the drop down
arrow to the right of the survey date below to choose a different report for this site.

Survey MSB11-PRK06

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

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2010


Comments: **2017: Updated photos submitted by Franklin Dekker, USFWS.*** Culvert located on one channel of Grey's Creek along the Parks Highway next to culvert PRK05 on the same creek which originates through a lowland marsh area with slough flow. Inlet has a large grate made from several vertical pieces of box tubing. Grate contains woody debris restricting some flow at inlet.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Structural steel plate) Fish Passage Rating: Green
 
Length(ft): 107.0
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 5
Approach Angle: 44.0
Sedimentation At Inlet: No
Inlet Substrate: Cobble
Outlet Substrate: Cobble
InletOutlet
Width(ft):11.95 11.85
Height(ft):11.1 11.18
Apron Length(ft):0.0 0.0
Water Depth(ft): 1.17
Rustline Height(ft):1.4
Substrate Depth(ft):1.1 0.85
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.9
Culvert Gradient: 0.52%
Max Slope:
Max Slope Length:

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelCobble
Subdominant:SandGravel
Stream Slope(deg.):0.6
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 83.0 13.50
Downstream ordinary high water 138.0 14.00
Downstream ordinary high water 190.0 12.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Water Surface Elev (Bottom of riffle. Used for stream gradient) 0.00 83.33
D/S Grade Ctrl (Thalweg) (Top of riffle) 79.00 83.11
D/S Water Surface Elev 79.00 83.93
D/S Water Surface Elev (Used for stream gradient.) 200.00 84.51
D/S Water Surface Elev (Tail water surface) 215.00 84.93
D/S Tailcrest or 1st Thalweg (Tail water control) 215.00 83.81
Max Pool Depth (Outlet pool depth) 255.00 82.75
D/S Water Surface Elev (Water surface at outlet invert) 287.50 85.12
Outlet Invert (On substrate) 287.50 83.95
Outlet Culvert Top 287.50 95.32
Road Elev 328.00 101.00
Inlet Culvert Top 369.50 95.75
Inlet Culvert Invert (On substrate) 369.50 84.49
U/S Water Surface Elev (Water surface at inlet invert) 369.50 85.85
U/S Water Surface Elev 439.00 86.41
U/S Thalweg (Profile point. Upstream glide, thalweg deeper than invert) 439.00 83.56

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