Fish Passage Improvement site 50101614

Fish Passage Site 50101614

Coordinates (dec. deg.): 64.81231°, -165.21580°
Legal Description: K008S032W07
Region: Arctic
Road Name: Kougarok Road

Datum: NAD83
Quad Name / ITM: Nome D-1
AWC Stream #:
Stream Name: Unnamed

Elevation:

Site Comments: Mile 25.3

Survey Date: Oct 08, 2005

Survey SEW05-KR26

site photos

Project Supervisor: Dave Ryland,
Observers: Dave Ryland, Jason Cheney

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Hydraulic flows exceeded capacity
Constriction ratio red

Comments: No flow through old pipe except at high water. The old pipe is the original x-ing. The new pipe was installed and the original channel blocked by gravel dike to driect flow through present pipe. Dike is u/s of island in sketch. Water now flows across u/s end of island and into old channel forming pond. See photos.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Red

Length(ft): 64.6

Inlet Type: Mitered

Outlet Type: Mitered

Corrugation Depth(in.): 0.75

Corrugation Width(in.): 2.75

Condition Rating(1-5): 3

Approach Angle: 7.0

Sedimentation At Inlet: Yes

Inlet Substrate: None

Outlet Substrate: None

	Inlet	Outlet
Width(ft):	5.8
Height(ft):	6.2
Apron Length(ft):
Water Depth(ft):		1.72
Rustline Height(ft):	2.4
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: At Stream Grade

Constriction Ratio: 0.17

Culvert Gradient: 0.50%

Max Slope:

Max Slope Length:

Comments: Water depth calc'ed. Riprap below outlet.

Culvert Observations:

Hydraulic flows exceeded capacity
Constriction ratio red

Stream Measurements

Stream Substrates	Upstream	Downstream
Dominant:	Gravel	Gravel
Subdominant:	Cobble	Cobble

Stream Slope(deg.):
Stream Flow Stage:

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Downstream ordinary high water	58.0	20.10
Downstream ordinary high water	121.0	20.60
Upstream bank full	75.0	57.10
Upstream bank full	100.0	49.40
Upstream bank full	125.0	51.40
Upstream bank full	170.0	40.10
Upstream bed width	75.0	22.80
Upstream bed width	100.0	23.30
Upstream bed width	125.0	33.00
Upstream bed width	170.0	28.60
Upstream ordinary high water	75.0	33.50
Upstream ordinary high water	100.0	28.80
Upstream ordinary high water	125.0	41.10
Upstream ordinary high water	170.0	34.10

Elevations

Locator ID	Culvert Number	River Distance (ft)¹	Distance From Crossing (ft)²	Relative Elevation (ft)
Max Pool Depth				1.70
Outlet Pool Water Elev				98.02
D/S Grade Ctrl (Thalweg)		0.00	121.0	92.84
D/S Tailcrest or 1st Thalweg		85.00	36.0	96.52
OHW (Outlet Tailcrest)		85.00	36.0	98.54
D/S Thalweg		116.00	5.0	1.20
Outlet Invert	1	121.00	0.0	96.30
Road Elev		153.00		106.81
Inlet Culvert Invert	1	185.00	0.0	96.62
U/S Thalweg		197.00	12.0	98.50
U/S Grade Ctrl (Thalweg)		205.00	20.0	99.13
U/S Grade Ctrl (Thalweg)		260.00	75.0	100.23
U/S Grade Ctrl (Thalweg)		355.00	170.0	101.80

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.