Fish Passage Improvement site 20100715

Fish Passage Site 20100715

Coordinates (dec. deg.): 61.81702°, -145.21522°
Legal Description: C001S001E03
Region: South Central
Road Name: Richardson Highway

Datum: NAD83
Quad Name / ITM: Valdez D-4
AWC Stream #:
Stream Name: Willow Creek

Elevation:

Site Comments: None

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-RICH32

site photos

Project Supervisor: Gillian O'Doherty, ADFG
Observers: Andrew Kastning

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Sediment accumulation

Comments: This assessment was conducted by the Copper River Watershed Project. Arctic Grayling caught up and downstream from culvert.

Culvert Measurements

ID: 1

Structure Type: Pipe-arch (Structural steel plate)

Fish Passage Rating: Green

Length(ft): 202.9

Inlet Type: Mitered

Outlet Type: Mitered

Corrugation Depth(in.): 2.0

Corrugation Width(in.): 6.0

Condition Rating(1-5): 4

Approach Angle: 15.0

Sedimentation At Inlet: Yes

Inlet Substrate: Cobble

Outlet Substrate: Silt/Clay

	Inlet	Outlet
Width(ft):	16.4	16.15
Height(ft):	9.06	9.52
Apron Length(ft):
Water Depth(ft):		1.08
Rustline Height(ft):	2.5
Substrate Depth(ft):	0.2	0.87

Backwatered?: No

Baffles Present: No

Embedded?: No

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 1.03

Culvert Gradient: 0.10%

Max Slope:

Max Slope Length:

Comments: Large sediement wedge at outlet. Substrate gradient though culvert .3%

Culvert Observations:

Sediment accumulation

Stream Measurements

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

Stream Slope(deg.):	0.02
Stream Flow Stage:	Medium

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Downstream ordinary high water		13.50
Downstream ordinary high water		9.20
Downstream ordinary high water		13.80
Upstream ordinary high water		20.20
Upstream ordinary high water		14.20
Upstream ordinary high water		15.30
Upstream ordinary high water		14.80

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
Road Elev		102.36
D/S Grade Ctrl (Thalweg)	0.00	85.25
D/S Water Surface Elev	0.00	88.31
D/S Tailcrest or 1st Thalweg (Tailwater control top of V)	66.00	88.06
D/S Water Surface Elev	66.00	88.71
D/S Water Surface Elev	68.00	88.71
D/S Thalweg (downstream riffle)	68.00	87.73
Outlet Invert	79.40	87.80
D/S Water Surface Elev	79.40	88.88
D/S Water Surface Elev	94.00	88.97
D/S Thalweg (Below top of culvert)	94.00	87.87
Outlet Culvert Top	94.00	97.32
Inlet Culvert Top	266.80	97.53
U/S Water Surface Elev	266.80	89.16
U/S Thalweg (Below top of culvert)	266.80	88.66
U/S Water Surface Elev	272.80	89.46
U/S Thalweg (Mid miter)	272.80	88.81
U/S Water Surface Elev	282.40	89.82
Inlet Culvert Invert	282.40	88.80
U/S Water Surface Elev	300.80	89.84
U/S Grade Ctrl (Thalweg)	300.80	88.32
U/S Grade Ctrl (Thalweg)	416.80	88.24
U/S Water Surface Elev	416.80	89.86

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.

Fish Sampling Efforts

Gear Type: Minnow Trap (A)		Trap Duration(h): 18.0
Comments: 2 Traps set upstream.

Gear Type: Minnow Trap (B)		Trap Duration(h): 18.0
Comments: 2 traps set downstream

Fish Observations

Species: juvenile Arctic grayling		Life History: Resident
Total Fish Observed: 5	Fish Measured: 5	Fork Lengths (mm) Min: 80 Max: 95 Mean: 86
Collected/Observed by Gear Type: Downstream Minnow Trap (3) Upstream Minnow Trap (2)

Photos

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