Fish Passage Improvement site 20501238

Fish Passage Site 20501238

Coordinates (dec. deg.): 61.75817°, -150.10738°
Legal Description: S019N005W12
Region: South Central
Road Name: Willow Creek Parkway

Datum: WGS84
Quad Name / ITM: Tyonek D-1
AWC Stream #: 247-41-10200-2120-3010
Stream Name: Shirley Lake outlet

Elevation:

Site Comments: Creek drains Shirley Lake into Willow Creek

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-WCP01

site photos

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

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: Maybe

Step Pools: No
Construction Year: 2015

Site Observations:

None of this type

Comments: Replaced in 2015 with a fish friendly culvert. Culvert resurveyed April 21st, 2016. Lots of fines in culvert, Lots of settling in barrel and downstream. Old beaver dam downstream. Water Ferric. No fish caught, but juveniles observed downstream near old beaver dam.

Culvert Measurements

ID: 1

Structure Type: Box culvert (Structural aluminum plate)

Fish Passage Rating: Green

Length(ft): 78.3

Inlet Type: Headwall

Outlet Type: Headwall

Corrugation Depth(in.): 4.0

Corrugation Width(in.): 9.0

Condition Rating(1-5): 5

Approach Angle: 30.0

Sedimentation At Inlet: No

Inlet Substrate: Silt/Clay

Outlet Substrate: Silt/Clay

	Inlet	Outlet
Width(ft):	13.02	13.65
Height(ft):	7.2	8.98
Apron Length(ft):
Water Depth(ft):		1.73
Rustline Height(ft):
Substrate Depth(ft):

Backwatered?: Maybe

Baffles Present: No

Embedded?: Yes

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 1.26

Culvert Gradient: 1.07%

Max Slope:

Max Slope Length:

Comments: Culvert set within 1% of stream gradient. Inlet and outlet water surfaces very close.

Culvert Observations:

None of this type

Stream Measurements

Stream Substrates	Upstream	Downstream
Dominant:	Gravel	Silt/Clay
Subdominant:	Sand	Organic

Stream Slope(deg.):	0.67
Stream Flow Stage:	Medium

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Upstream ordinary high water	50.0	15.40
Upstream ordinary high water	100.0	10.60
Upstream ordinary high water	150.0	10.70
Upstream ordinary high water	250.0	4.50

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
Outlet Culvert Top (These measurements are not connected to the benchmark and were used to establish pipe gradient.)		4.04
Inlet Culvert Top		4.88
Road Elev		107.76
D/S Thalweg (Head of gravel bar)	0.00	89.00
D/S Water Surface Elev	0.00	89.82
D/S Tailcrest or 1st Thalweg	41.00	89.33
D/S Water Surface Elev	41.00	90.23
D/S Water Surface Elev	91.00	90.34
D/S Thalweg (Middle of outlet glide)	91.00	88.52
Outlet Invert (On substrate)	141.00	88.73
D/S Water Surface Elev	141.00	90.46
U/S Water Surface Elev	219.30	90.48
Inlet Culvert Invert (On substrate, 1st resting)	219.30	88.91
U/S Thalweg (Middle of constructed inlet riffle)	233.30	89.62
U/S Water Surface Elev	233.30	90.44
U/S Water Surface Elev	299.30	90.66
U/S Grade Ctrl (Thalweg) (End of constructed inlet riffle)	299.30	89.92
U/S Grade Ctrl (Thalweg)	351.30	90.66
U/S Water Surface Elev (Stream gradient start)	351.30	90.96
U/S Water Surface Elev (Stream gradient end)	443.30	91.37
U/S Grade Ctrl (Thalweg)	443.30	90.75

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.