Fish Passage Site 20502067

Coordinates (dec. deg.): 63.15910°, -147.48756°
Legal Description: F020S001E26
Region: South Central
Road Name: Valdez Mining District Road

Datum: NAD83
Quad Name / ITM: Healy A-1
AWC Stream #:
Stream Name: Susitna River tributary

Elevation:

Site Comments: None

Survey Date: Jul 07, 2011

Survey MSB11-VMD06

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

Comments: Pipe 2 is 0.20' from being completely submerged at inlet and the outlet is a free fall to cascade over rip rap. Pipe 1 outfall is a cascade over rip rap. The downstream channel is extensively braided.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 21.9
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.75
Condition Rating(1-5): 3
Approach Angle: 10.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):2.45 1.95
Height(ft):2.4 2.9
Apron Length(ft):0.0 0.0
Water Depth(ft): 0.48
Rustline Height(ft):0.7
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.03
Outfall Type: Cascade Over Rip-Rap
Constriction Ratio: 0.58
Culvert Gradient: 3.20%
Max Slope:
Max Slope Length:
 

Comments: Pipe 1 Outlet has a small outfall height cascading over rocks into a very shallow pool area between several rocks before a steeply graded rocky cascade starts to create a maximum gradient section. Max grad at end of pipe 1 is 32.8% over 40' and max grad at end of pipe 2 is 40.4% over 25'.
  Culvert Observations:
  1. Culvert gradient red
  2. Constriction ratio gray
ID: 2 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 39.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.5
Condition Rating(1-5): 3
Approach Angle: 10.0
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: Cobble
InletOutlet
Width(ft):1.5 1.7
Height(ft):1.5 2.1
Apron Length(ft):0.0 0.0
Water Depth(ft): 0.29
Rustline Height(ft):1.5
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 1.15
Outfall Type: Free Fall on To Rip Rap
Constriction Ratio: 0.58
Culvert Gradient: 4.84%
Max Slope: 40.4
Max Slope Length: 25.0
 

Comments: Pipe 2 has a free fall outfall to cascade over rip rap.
  Culvert Observations:
  1. Outfall height red
  2. Culvert gradient red
  3. Constriction ratio gray

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicCobble
Subdominant:Silt/ClayGravel
Stream Slope(deg.):10.1
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 100.0 5.10
Upstream ordinary high water 130.0 4.80
Upstream ordinary high water 170.0 5.30

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Grade Ctrl (Thalweg) (Mid point of riffle) 0.00 85.99
D/S Water Surface Elev 0.00 86.57
D/S Grade Ctrl (Thalweg) (Start of downstream cascade) 40.00 90.24
D/S Water Surface Elev 40.00 90.61
Outlet Thalweg (Just outside of pipe 2 outlet) 2 65.00 96.51
D/S Water Surface Elev 2 65.00 96.67
Outlet Invert (On pipe) 2 65.00 97.53
D/S Water Surface Elev (Water surface at Pipe 2 outlet invert) 2 65.00 97.82
Outlet Culvert Top 2 65.00 99.73
D/S Water Surface Elev 1 80.00 99.69
D/S Water Surface Elev (Water surface at pipe 1 outlet invert) 1 80.00 99.72
Outlet Culvert Top 1 80.00 102.09
Outlet Thalweg (On rock substrate just outside pipe 1 outlet) 1 80.00 99.06
Outlet Invert (On pipe) 1 80.00 99.24
Road Elev 90.00 103.58
Inlet Culvert Top 1 101.90 102.48
Inlet Culvert Invert (On pipe) 1 101.90 99.94
U/S Water Surface Elev (Water surface at pipe 1 inlet invert) 1 101.90 100.62
U/S Water Surface Elev (Water surface at pipe 2 inlet invert) 2 104.50 100.71
Inlet Culvert Invert (On pipe) 2 104.50 99.44
Inlet Culvert Top 2 104.50 100.96
Max Pool Depth (Max pool depth upstream of inlet) 114.50 96.26
U/S Water Surface Elev (Water surface at upstream max pool) 114.50 100.72

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