Fish Passage Site 20100629

Coordinates (dec. deg.): 60.58948°, -145.64084°
Legal Description: C015S002W07
Region: South Central
Road Name: Power Creek Road

Datum: NAD83
Quad Name / ITM: Cordova C-5
AWC Stream #: 212-10-10050-2250-3013
Stream Name: Power Creek tributary

Elevation:

Site Comments: None

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 UPD21-POW6

Project Supervisor: Kim Clark, ADFG — Anchorage, AK
Observers: Kirsti Jurica, Kirsti Jurica

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert is poorly aligned
  2. Constriction ratio gray

Comments: Site update submitted by Kirsti Jurica with CRWP.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Red
 
Length(ft): 41.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5): 3
Approach Angle: 40.0
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):5.05 5.15
Height(ft):5.16 5.01
Apron Length(ft):
Water Depth(ft): 0.85
Rustline Height(ft):1.9
Substrate Depth(ft): 0.1
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.53
Culvert Gradient: 2.48%
Max Slope:
Max Slope Length:
 

Comments: Pipe #1 is placed at high elevation. Trickle at outlet of Pipe #1 during survey. On 4.20.20 during low flow conditions an elevation change of 1.38ft was observed at the outlet over a rocky apron.

  Culvert Observations:
  1. Culvert is poorly aligned
  2. Constriction ratio gray
  3. Culvert gradient red
ID: 2 Structure Type: Open-bottom arch (Structural steel plate) Fish Passage Rating: Gray
 
Length(ft): 48.5
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 3
Approach Angle:
Sedimentation At Inlet: Yes
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):9.6 9.9
Height(ft):5.85 5.15
Apron Length(ft):
Water Depth(ft): 1.18
Rustline Height(ft):1.6
Substrate Depth(ft):
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.53
Culvert Gradient: 0.10%
Max Slope:
Max Slope Length:
 

Comments: Substrate depth not meausred but if it is a round pipe we can infer it was 4.15 feet deep at the inlet and 4.85 feet deep at the oulet.

  Culvert Observations:
  1. Culvert is poorly aligned
  2. Constriction ratio gray

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelCobble
Subdominant:SandGravel
Stream Slope(deg.):1
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)
Stream
Width (ft)
Upstream ordinary high water 22.40
Upstream ordinary high water 20.10
Upstream ordinary high water 18.70

Elevations

Locator ID Culvert
Number
River
Distance (ft)1
Distance From
Crossing (ft)2
Relative
Elevation (ft)
Road Elev (Road Surface) 100.00
U/S Thalweg 0.00 93.29
U/S Water Surface Elev 0.00 93.57
U/S Thalweg (upstream of overflow pipe in side channel) 0.00 93.20
U/S Water Surface Elev 0.00 93.48
U/S Thalweg 19.00 93.18
U/S Water Surface Elev 19.00 93.23
Inlet Culvert Invert (Inlet invert of ovrflow pipe) 24.00 92.85
U/S Water Surface Elev 24.00 93.00
U/S Thalweg 34.00 92.94
U/S Water Surface Elev 34.00 93.30
U/S Thalweg 77.00 92.57
U/S Water Surface Elev 77.00 93.08
U/S Thalweg (Large sediment dump upstream of Pipe 2.) 77.00 90.14
Inlet Culvert Invert (Pipe #1) 82.00 91.91
U/S Water Surface Elev 82.00 93.06
Inlet Culvert Invert (Overflow pipe) 82.00 92.85
U/S Water Surface Elev 82.00 93.00
Inlet Culvert Top (Pipe #1) 82.00 97.76
Inlet Culvert Top (Overflow pipe) 82.00 98.01
Outlet Culvert Top (Pipe #1) 131.00 96.98
Outlet Culvert Top (Overflow pipe) 131.00 97.15
D/S Water Surface Elev 131.00 93.01
Outlet Invert (Overflow pipe) 131.00 92.14
Outlet Invert (Pipe #1) 131.00 91.83
D/S Water Surface Elev (outlet invert water surface overflow and Pipe #1 not specified) 131.00 92.99
Max Pool Depth 136.00 91.00
D/S Water Surface Elev 136.00 93.01

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