Fish Passage Site 20501182

Coordinates (dec. deg.): 61.70733°, -150.08525°
Legal Description: S019N005W25
Region: South Central
Road Name: Crystal Lake Road

Datum: WGS84
Quad Name / ITM: Tyonek C-1
AWC Stream #:
Stream Name: Rainbow Lake to Long Lake connection

Elevation:

Site Comments: Rainbow Lake to Long Lake connection

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 MSB09-CRL01

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient red
  2. Beaver Activity

Comments: Scattered small and large cobble inside pipe; u/s looks like torn-out beaver dam; u/s and d/s stream opens into marshy wetland.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Structural steel plate) Fish Passage Rating: Red
 
Length(ft): 80.4
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 2.67
Condition Rating(1-5): 2
Approach Angle: 22.0
Sedimentation At Inlet: No
Inlet Substrate: None
Outlet Substrate: Gravel
InletOutlet
Width(ft):5.8 6.1
Height(ft):6.0 5.8
Apron Length(ft):
Water Depth(ft): 0.38
Rustline Height(ft):0.8
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.09
Culvert Gradient: 2.21%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient red
  2. Beaver Activity

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:CobbleSand
Stream Slope(deg.):
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Upstream ordinary high water 38.0 5.50
Upstream ordinary high water 85.0 6.00
Upstream ordinary high water 116.0 4.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Grade Ctrl (Thalweg) 1 0.00 29.0 92.27
D/S Water Surface Elev (@GP) 1 0.00 29.0 92.40
D/S Tailcrest or 1st Thalweg 1 16.00 13.0 92.42
D/S Water Surface Elev (@TWC) 1 16.00 13.0 92.55
Max Pool Depth (bottom of out pool) 1 25.00 4.0 92.08
Outlet Invert 1 29.00 0.0 92.19
Outlet Pool Water Elev 1 29.00 92.57
Road Elev 1 69.00 103.24
Inlet Culvert Invert 1 109.40 0.0 93.97
U/S Headwater 1 109.40 94.21
U/S Thalweg 1 110.40 1.0 93.94

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