Fish Passage Site 20501060

Coordinates (dec. deg.): 61.59826°, -149.62178°
Legal Description: S017N002W03
Region: South Central
Road Name: Karen Street

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #:
Stream Name: Rainbow Lake inlet

Elevation:

Site Comments: Rainbow Lake Drainage

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 MSB23-MS115

Project Supervisor: Michael Mazzacavallo, Alaska Department of Fish and Game — Anchorage, AK
Observers: Michael Mazzacavallo, Kat Leavitt, Beth Evers

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Outfall height gray
  2. Culvert gradient red

Comments: Sticklebacks spotted upstream. Connecting wetland/ pond.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 49.71
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.5
Condition Rating(1-5): 5
Approach Angle: 0.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):1.95 1.92
Height(ft):1.89 1.9
Apron Length(ft):
Water Depth(ft):0.0 0.0
Rustline Height(ft):0.0
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Embedded Depth(ft): 0.0
Outfall Height: 0.0
Outfall Type: Overflow Pipe
Constriction Ratio:
Culvert Gradient: 2.40%
Max Slope:
Max Slope Length:
 

Comments: #1 culvert is overflow pipe. Slight damamge to the top of outlet of overflow pipe #1.
  Culvert Observations:
  1. Outfall height gray
  2. Culvert gradient red
ID: 2 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 59.8
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 1.0
Corrugation Width(in.): 3.0
Condition Rating(1-5): 4
Approach Angle: 0.0
Sedimentation At Inlet: No
Inlet Substrate: Gravel
Outlet Substrate: Gravel
InletOutlet
Width(ft):6.0 5.75
Height(ft):4.45 3.61
Apron Length(ft):
Water Depth(ft): 0.59
Rustline Height(ft):1.0
Substrate Depth(ft):1.55 2.39
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 1.55
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio:
Culvert Gradient: 2.98%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Outfall height gray
  2. Culvert gradient red

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:OrganicOrganic
Subdominant:Silt/ClaySilt/Clay
Stream Slope(deg.):
Stream Flow Stage:Medium

No stream width data available.

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Outlet Invert 1 95.23
Inlet Culvert Invert 1 96.11
Outlet Culvert Top 1 96.81
Inlet Culvert Top 1 98.00
Road Elev 100.14
U/S Water Surface Elev 0.00 94.92
Inlet Culvert Invert 2 20.00 94.15
U/S Water Surface Elev 2 20.00 94.84
Inlet Culvert Top 2 20.00 98.54
Outlet Culvert Top 2 79.80 96.76
D/S Water Surface Elev 2 79.80 94.07
Outlet Invert 2 79.80 93.48
D/S Thalweg 80.80 93.12
D/S Water Surface Elev 80.80 93.83
D/S Water Surface Elev 104.80 93.64

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