Fish Passage Site 20501397

Coordinates (dec. deg.): 62.32406°, -150.51842°
Legal Description: S026N007W23
Region: South Central
Road Name: Petersville Road

Datum: NAD83
Quad Name / ITM: Talkeetna B-2
AWC Stream #: 247-41-10200-2081-3100-4167-5045
Stream Name: Gate 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-PVR09

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

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: Yes

Step Pools:
Construction Year:


Site Observations:

  1. Constriction ratio gray
  2. Shallow fill; inadequate roadfill volume above culvert
  3. Mechanical damage or joints parting

Comments: Resurvey of PRK041A034.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 45.7
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 2
Approach Angle: 6.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):7.8 8.1
Height(ft):8.0 7.4
Apron Length(ft):
Water Depth(ft): 1.05
Rustline Height(ft):4.2
Substrate Depth(ft):0.0 0.0
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.62
Culvert Gradient: -0.18%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Constriction ratio gray
  2. Shallow fill; inadequate roadfill volume above culvert
  3. Mechanical damage or joints parting
ID: 2 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 45.4
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 2
Approach Angle: 6.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: Cobble
InletOutlet
Width(ft):7.7 7.6
Height(ft):7.8 7.5
Apron Length(ft):
Water Depth(ft): 0.63
Rustline Height(ft):4.2
Substrate Depth(ft):0.0 0.3
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.62
Culvert Gradient: -0.66%
Max Slope:
Max Slope Length:
 

Comments: Resurvey of 1A034. Two large boulders at outlet invert partially back up water in pipe.
  Culvert Observations:
  1. Constriction ratio gray
  2. Shallow fill; inadequate roadfill volume above culvert
  3. Mechanical damage or joints parting
ID: 3 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 45.7
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 2
Approach Angle: 6.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: Cobble
InletOutlet
Width(ft):7.5 7.5
Height(ft):7.8 7.4
Apron Length(ft):
Water Depth(ft): 1.1
Rustline Height(ft):4.7
Substrate Depth(ft):0.0 0.2
Backwatered?: Yes
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.62
Culvert Gradient: -0.85%
Max Slope:
Max Slope Length:
 

Comments: Resurvey of 1A034
  Culvert Observations:
  1. Constriction ratio gray
  2. Shallow fill; inadequate roadfill volume above culvert
  3. Mechanical damage or joints parting

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelCobble
Subdominant:CobbleGravel
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 50.0 21.00
Upstream ordinary high water 95.0 25.00
Upstream ordinary high water 140.0 23.00
Upstream ordinary high water 200.0 16.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Pool Water Elev 2 98.57
U/S Headwater 1 98.60
Outlet Pool Water Elev 1 98.61
Outlet Pool Water Elev 3 98.62
U/S Headwater 2 98.63
U/S Headwater 3 98.63
D/S Water Surface Elev (WS at GP) 0.00 36.0 98.53
D/S Grade Ctrl (Thalweg) 0.00 36.0 97.90
D/S Tailcrest or 1st Thalweg 2 23.50 12.5 98.06
D/S Water Surface Elev (WS at TWC) 2 23.50 12.5 98.56
D/S Water Surface Elev 1 28.20 7.8 98.58
D/S Tailcrest or 1st Thalweg 1 28.20 7.8 98.17
D/S Water Surface Elev (WS at GP) 1 29.60 6.4 98.62
D/S Water Surface Elev (WS at TWC) 3 30.00 6.0 98.57
D/S Tailcrest or 1st Thalweg 3 30.00 6.0 98.19
D/S Thalweg (bottom of outlet pool) 2 30.00 6.0 97.62
D/S Water Surface Elev (WS at GP) 2 31.20 4.8 98.62
Outlet Invert 2 36.00 0.0 97.97
Outlet Invert 3 36.00 0.0 97.52
Outlet Invert 1 36.00 0.0 97.56
Road Elev 58.50 107.62
Inlet Culvert Invert 1 81.00 0.0 97.48
Inlet Culvert Invert 3 81.00 0.0 97.13
Inlet Culvert Invert 2 81.00 0.0 97.67
U/S Thalweg (bottom of pool at inlet) 2 82.80 1.8 97.13
U/S Thalweg (bottom of pool at inlet) 1 84.00 3.0 97.10
U/S Grade Ctrl (Thalweg) 2 85.80 4.8 97.22
U/S Thalweg (bottom of pool at inlet; no TC u/s) 3 86.00 5.0 96.64
U/S Grade Ctrl (Thalweg) 1 87.40 6.4 98.13

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