Fish Passage Improvement site 30303072

Fish Passage Site 30303072

Coordinates (dec. deg.): 59.04523°, -158.52838°
Legal Description: S013S055W18
Region: Southwest
Road Name: Emperor Way

Datum: NAD83
Quad Name / ITM: Dillingham A-7
AWC Stream #:
Stream Name: Seven Sisters Creek tributary

Elevation:

Site Comments: Stream and Watershed name changed to local name on 11.24.21

Survey Date: Sep 20, 2012

Survey SWA12-DIL10

site photos

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: Gillian O'Doherty, Mark Eisenman

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: Yes

Step Pools: No
Construction Year: 1999

Comments: Pipe is stained, cannot measure rust line. Might be embedded, but too deep to measure all the way through. Very deep (>5 ft.) and narrow upstream. Flat and wider on downstream side of road. Slilght flow, not much through pipe.

Culvert Measurements

ID: 1

Structure Type: Pipe-arch (Structural steel plate)

Fish Passage Rating: Green

Length(ft): 84.6

Inlet Type: Mitered

Outlet Type: Mitered

Corrugation Depth(in.): 2.0

Corrugation Width(in.): 6.0

Condition Rating(1-5): 4

Approach Angle: 0.0

Sedimentation At Inlet: No

Inlet Substrate: Silt/Clay

Outlet Substrate: Silt/Clay

	Inlet	Outlet
Width(ft):	13.0	13.0
Height(ft):	7.5	5.7
Apron Length(ft):
Water Depth(ft):		2.64
Rustline Height(ft):
Substrate Depth(ft):	1.0	2.0

Backwatered?: Yes

Baffles Present: No

Embedded?: Maybe

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 2.05

Culvert Gradient: 0.19%

Max Slope:

Max Slope Length:

Comments: Substrate depth measurements are minimal. Top of miter length is 84.6 feet.

Stream Measurements

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

Stream Slope(deg.):	0.08
Stream Flow Stage:	Medium

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Upstream ordinary high water	89.0	4.00
Upstream ordinary high water	112.0	6.00
Upstream ordinary high water	150.0	9.00

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
Road Elev		97.90
D/S Water Surface Elev (appro 4.5 feet deep at this spot)	0.00	87.40
Outlet Culvert Top (top of miter)	30.00	90.50
Outlet Invert	30.00	84.70
D/S Water Surface Elev	30.00	87.34
Inlet Culvert Invert	114.60	82.99
U/S Water Surface Elev	114.60	87.33
Inlet Culvert Top (top of miter)	114.60	90.66
U/S Water Surface Elev (sg)	154.60	87.31
U/S Water Surface Elev (sg)	273.60	87.41

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.