Fish Passage Site 20501433

Coordinates (dec. deg.): 61.70440°, -150.00311°
Legal Description: S019N004W28
Region: South Central
Road Name: BUCKINGHAM PALACE Road

Datum: NAD83
Quad Name / ITM: Tyonek C-1
AWC Stream #: 247-41-10100-2231-3080
Stream Name: Lilly Creek

Elevation:

Site Comments: SUSITNA RIVER WATERSHED, THIS SITE IS WEST OF PARKS HWY AT WHITES CROSSING

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-BHP01

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. Improper bedding
  2. Sediment accumulation
  3. Woody Debris
  4. Culvert gradient red

Comments: Pipes sag a little in the middle. Pipes appeared to be either smashed circular or oval shaped pipes. Pipe 2 inlet accepts majority of flow although at outlet the thalweg switches to pipe 1 outlet area. Upst channel area has been altered with railroad bridge and Parks Highway overpass fill.

Culvert Measurements

ID: 1 Structure Type: Oval (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 56.3
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5): 3
Approach Angle: 25.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: Cobble
InletOutlet
Width(ft):6.4 6.4
Height(ft):5.0 4.25
Apron Length(ft):0.0 0.0
Water Depth(ft): 0.24
Rustline Height(ft):0.85
Substrate Depth(ft):0.0 0.6
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.78
Culvert Gradient: 3.45%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Improper bedding
  2. Sediment accumulation
  3. Woody Debris
  4. Culvert gradient red
ID: 2 Structure Type: Oval (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 56.4
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5): 3
Approach Angle: 25.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: Cobble
InletOutlet
Width(ft):6.6 6.35
Height(ft):5.1 4.75
Apron Length(ft):0.0 0.0
Water Depth(ft): 0.84
Rustline Height(ft):3.2
Substrate Depth(ft):0.0 0.2
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.8
Culvert Gradient: 2.27%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Improper bedding
  2. Woody Debris
  3. Culvert gradient red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleCobble
Subdominant:OrganicOrganic
Stream Slope(deg.):2.84
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 68.0 9.50
Downstream ordinary high water 95.0 6.65
Downstream ordinary high water 125.0 8.50

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 88.20
D/S Water Surface Elev (Used for stream gradient) 0.00 88.51
D/S Grade Ctrl (Thalweg) 29.00 89.06
D/S Water Surface Elev 29.00 89.33
D/S Grade Ctrl (Thalweg) 56.00 89.92
D/S Water Surface Elev (Used for stream gradient) 56.00 90.10
Outlet Invert 2 77.00 90.26
Outlet Invert 1 77.00 90.59
D/S Water Surface Elev (Water surface at outlet) 1 77.00 90.83
D/S Water Surface Elev 2 77.00 91.10
Outlet Culvert Top 1 77.00 94.86
Outlet Culvert Top 2 77.00 95.01
Road Elev 105.00 99.75
Inlet Culvert Top 2 133.40 96.29
Inlet Culvert Top 1 133.40 96.80
Inlet Culvert Invert 2 133.40 91.21
U/S Water Surface Elev (Water surface at inlet) 2 133.40 91.71
Inlet Culvert Invert 1 133.40 91.72
U/S Water Surface Elev (Water surface at inlet) 1 133.40 91.75
U/S Grade Ctrl (Thalweg) 152.80 92.08
U/S Water Surface Elev 152.80 92.79

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