Fish Passage Improvement site 10103604

Fish Passage Site 10103604

Coordinates (dec. deg.): 55.71452°, -132.91632°
Legal Description: C071S081E13
Region: Southeast
Road Name: North Prince of Wales Road

Datum: NAD83
Quad Name / ITM: Craig C-3
AWC Stream #:
Stream Name: Unnamed

Elevation:

Site Comments: Near MP 19

Survey Date: Jul 21, 2017

Survey SEA17-NPW38

site photos

Observers: Elizabeth Flory, Kelly Petty

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Outfall height red
Culvert gradient red
Constriction ratio gray

Comments: Steep cascades upstream, 4ft high steps - one with bedrock and large woody debris and one with large woody debris and gravel. Downstream has shallow riffles, too shallow to set a trap, and steep cascades. First resting at inlet.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Red

Length(ft): 86.0

Inlet Type: Mitered

Outlet Type: Mitered

Corrugation Depth(in.): 1.0

Corrugation Width(in.): 3.0

Condition Rating(1-5): 4

Approach Angle: 40.0

Sedimentation At Inlet: Yes

Inlet Substrate: Gravel

Outlet Substrate: None

	Inlet	Outlet
Width(ft):	2.0	2.0
Height(ft):	1.4	2.37
Apron Length(ft):
Water Depth(ft):		0.07
Rustline Height(ft):
Substrate Depth(ft):	0.6	0.0

Backwatered?: No

Baffles Present: No

Embedded?: No

Outfall Height: 0.53

Outfall Type: Free Fall In To Pool

Constriction Ratio: 0.57

Culvert Gradient: 6.43%

Max Slope:

Max Slope Length:

Comments: Inlet receives some drainage from road ditch. Stream gradient over reach that is only 10x width. Top of culvert length 72'.

Culvert Observations:

Outfall height red
Culvert gradient red
Constriction ratio gray

Stream Measurements

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

Stream Slope(deg.):	8.08
Stream Flow Stage:	Medium

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Upstream ordinary high water	30.0	3.50
Upstream ordinary high water	50.0	3.00
Upstream ordinary high water	70.0	4.00

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
Road Elev		103.24
D/S Grade Ctrl (Thalweg)	0.00	96.03
D/S Water Surface Elev	0.00	96.27
D/S Tailcrest or 1st Thalweg (boulders)	8.00	96.39
D/S Water Surface Elev	8.00	96.75
D/S Water Surface Elev	14.00	97.19
Max Pool Depth	14.00	96.67
Outlet Invert (7ft mitre on pipe)	19.00	97.65
D/S Water Surface Elev	19.00	97.72
Outlet Culvert Top	26.00	100.02
Inlet Culvert Top	98.00	104.65
Inlet Culvert Invert (7ft mitre on substrate)	105.00	103.26
U/S Water Surface Elev	105.00	103.40
U/S Grade Ctrl (Thalweg) (first resting)	109.00	103.60
U/S Water Surface Elev	109.00	103.85
U/S Grade Ctrl (Thalweg)	119.00	104.99
U/S Water Surface Elev	119.00	105.54
U/S Grade Ctrl (Thalweg)	148.00	106.67
U/S Water Surface Elev	148.00	107.00

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.