Fish Passage Improvement site 50101591

Fish Passage Site 50101591

Coordinates (dec. deg.): 65.35561°, -164.67437°
Legal Description: K001S029W32
Region: Arctic
Road Name: Kougarok Road

Datum: NAD83
Quad Name / ITM: Bendeleben B-6
AWC Stream #:
Stream Name: Dahl Creek

Elevation:

Site Comments: Mile 79.5

Survey Date: Sep 16, 2005

Survey SEW05-KR03

site photos

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

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Mechanical damage or joints parting
Beaver Activity
Outfall height red
Culvert gradient red
Constriction ratio gray
Road bank erosion

Comments: Huge scour pool at outlet. Flows too high to measure stream width at OHW. Beaver dam 150' upstream.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Red

Length(ft): 81.7

Inlet Type: Mitered

Outlet Type: Mitered

Corrugation Depth(in.): 2.0

Corrugation Width(in.): 6.0

Condition Rating(1-5): 2

Approach Angle: 28.0

Sedimentation At Inlet:

Inlet Substrate: None

Outlet Substrate: None

	Inlet	Outlet
Width(ft):	11.0
Height(ft):	9.0
Apron Length(ft):
Water Depth(ft):
Rustline Height(ft):	3.6
Substrate Depth(ft):	0.0	0.0

Backwatered?: No

Baffles Present: No

Embedded?: No

Embedded Depth(ft): 0.0

Outfall Height: 0.45

Outfall Type: Free Fall In To Pool

Constriction Ratio: 0.62

Culvert Gradient: 4.86%

Max Slope:

Max Slope Length:

Comments: High water during survey.

Culvert Observations:

Mechanical damage or joints parting
Beaver Activity
Road bank erosion
Constriction ratio gray
Outfall height red
Culvert gradient red

Stream Measurements

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

Stream Slope(deg.):
Stream Flow Stage:	High

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Downstream ordinary high water	512.0	15.20
Upstream bank full	75.0	25.40
Upstream bank full	100.0	21.50
Upstream bank full	125.0	16.60
Upstream bank full	150.0	40.50
Upstream ordinary high water	75.0	15.20
Upstream ordinary high water	100.0	14.60
Upstream ordinary high water	125.0	16.10
Upstream ordinary high water	150.0	24.60

Elevations

Locator ID	Culvert Number	River Distance (ft)¹	Distance From Crossing (ft)²	Relative Elevation (ft)
Outlet Pool Water Elev				85.96
U/S Thalweg				93.23
D/S Grade Ctrl (Thalweg)		0.00	274.0	83.72
D/S Tailcrest or 1st Thalweg		220.00	54.0	84.57
OHW (Outlet Tailcrest)		220.00	54.0	85.96
Outlet Invert	1	274.00	0.0	86.41
Road Elev		314.50		110.89
Inlet Culvert Invert	1	355.00	0.0	90.38
U/S Thalweg		375.00	20.0	90.06
U/S Grade Ctrl (Thalweg)		505.00	150.0	92.73

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.