Fish Passage Site 20501417

Coordinates (dec. deg.): 62.20234°, -150.06689°
Legal Description: S024N004W06
Region: South Central
Road Name: Talkeetna Spur Road

Datum: NAD83
Quad Name / ITM: Talkeetna A-1
AWC Stream #: 247-41-10200-2300-3011-4006
Stream Name: Answer 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 PRK09-TSR02

Project Supervisor: Gillian O'Doherty, ADFG
Observers: Heidi Zimmer, Ben Histand

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient red
  2. Constriction ratio gray
  3. Outfall height red
  4. Compound gradient in pipe
  5. Beaver Activity
  6. Inlet perch

Comments: Resurvey of PRK041A054; subs at outlet mitre, does not affect out height. Outfall height is cascade over Boulder. Downstream from outlet are a series of failed log weirs.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Structural steel plate) Fish Passage Rating: Red
 
Length(ft): 110.0
Inlet Type: Mitered
Outlet Type: Mitered
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 3
Approach Angle: 27.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):11.0 10.7
Height(ft):13.0 13.0
Apron Length(ft):
Water Depth(ft): 1.65
Rustline Height(ft):2.7
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 2.44
Outfall Type: Cascade Over Rip-Rap
Constriction Ratio: 0.53
Culvert Gradient: 1.38%
Max Slope: 2.14
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient red
  2. Constriction ratio gray
  3. Outfall height red
  4. Compound gradient in pipe
  5. Beaver Activity
  6. Inlet perch

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelCobble
Subdominant:GravelGravel
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 135.0 24.50
Downstream ordinary high water 188.0 17.00
Downstream ordinary high water 265.0 19.00

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
U/S Headwater 1 98.60
D/S Water Surface Elev 1 0.00 79.0 99.84
D/S Grade Ctrl (Thalweg) 1 20.00 59.0 91.99
D/S Water Surface Elev (ws @ GP) 1 20.00 59.0 93.40
D/S Tailcrest or 1st Thalweg 1 54.00 25.0 93.65
Outlet Pool Water Elev (ws of out pool) 1 59.00 20.0 94.59
D/S Thalweg (bottom out pool) 1 59.00 20.0 93.04
D/S Thalweg (top of step above out pool) 1 66.00 13.0 94.44
D/S Thalweg (top of riffle into main thalweg L side outlet) 1 67.00 12.0 93.90
D/S Thalweg (bottom 1st plunge) 1 75.50 3.5 94.38
Outlet Invert 1 79.00 0.0 95.38
Inlet Culvert Invert 1 189.00 0.0 96.90
U/S Thalweg 1 211.00 22.0 97.82
U/S Thalweg 1 220.00 31.0 98.48
U/S Grade Ctrl (Thalweg) 1 268.00 79.0 98.98

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