Fish Passage Improvement site 20501182

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 UPDATE-CRL01

site photos

Project Supervisor: Gillian O'Doherty, ADFG
Observers: Mark Eisenman, Gillian O'Doherty

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year: 2015

Site Observations:

None of this type

Comments: Culvert replaced July 2015. Nice constructed banks along sides of culvert. All construction sediment control has been removed and banks are starting to green up nicely.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Green

Length(ft): 92.9

Inlet Type: Projecting

Outlet Type: Projecting

Corrugation Depth(in.): 1.0

Corrugation Width(in.): 3.0

Condition Rating(1-5): 5

Approach Angle:

Sedimentation At Inlet: No

Inlet Substrate:

Outlet Substrate:

	Inlet	Outlet
Width(ft):	7.9	8.0
Height(ft):	6.5	5.3
Apron Length(ft):
Water Depth(ft):		0.45
Rustline Height(ft):
Substrate Depth(ft):

Backwatered?: No

Baffles Present: No

Embedded?: Yes

Embedded Depth(ft): 1.5

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio:

Culvert Gradient: 1.63%

Max Slope:

Max Slope Length:

Comments: Stream gradient cal

Stream Measurements

Stream Substrates	Upstream	Downstream
Dominant:
Subdominant:

Stream Slope(deg.):	1.75
Stream Flow Stage:	Low

No stream width data available.

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
Road Elev		103.99
D/S Water Surface Elev	0.00	93.23
D/S Thalweg	0.00	92.71
D/S Grade Ctrl (Thalweg) (Gravel Bar)	38.00	93.29
D/S Water Surface Elev	38.00	93.54
D/S Water Surface Elev	62.00	93.58
D/S Thalweg (Middle of outlet riffle)	62.00	93.14
Outlet Invert (On substrate)	83.00	93.18
Outlet Culvert Top	83.00	98.52
D/S Water Surface Elev	83.00	93.63
Inlet Culvert Invert (On substrate, 1st resting)	175.90	94.10
U/S Water Surface Elev	175.90	94.62
Inlet Culvert Top	175.90	100.03
U/S Thalweg (Upstream riffle)	204.90	95.60
U/S Water Surface Elev	204.90	95.94
U/S Thalweg (Middle of riffle)	254.90	96.74
U/S Water Surface Elev	254.90	97.51
U/S Grade Ctrl (Thalweg) (Old Beaver dam)	289.90	98.01
U/S Water Surface Elev	289.90	98.61
U/S Water Surface Elev	375.90	98.60
U/S Thalweg (Above old beaver dam)	375.90	97.36

Notes:

River distance is measured continuously throughout the survey reach along the thalweg of the stream.
Measured from each end of the crossing along the thalweg of the stream.