Fish Passage Improvement site 20502071

Fish Passage Site 20502071

Coordinates (dec. deg.): 61.69472°, -149.26093°
Legal Description: S019N001E34
Region: South Central
Road Name: North Solid Rock Circle

Datum: NAD83
Quad Name / ITM: Anchorage C-7
AWC Stream #:
Stream Name:

Elevation:

Site Comments: None

Survey Date: Sep 14, 2011

Survey MSB11-SRC01

site photos

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: Abraham Gioffre, Jim Latham

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Culvert gradient gray
Culvert is too short
Culvert is poorly aligned
Mechanical damage or joints parting

Comments: upst area relatively steep and the dwst channel is relatively narrow and then splits about 100' dwst. Pipe has a slight bend near the outlet so length was measured with a tape.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Gray

Length(ft): 50.3

Inlet Type: Projecting

Outlet Type: Projecting

Corrugation Depth(in.): 0.5

Corrugation Width(in.): 2.75

Condition Rating(1-5): 3

Approach Angle: 50.0

Sedimentation At Inlet: No

Inlet Substrate: Cobble

Outlet Substrate: Cobble

	Inlet	Outlet
Width(ft):	4.7	5.0
Height(ft):	2.6	2.1
Apron Length(ft):
Water Depth(ft):		0.76
Rustline Height(ft):	1.5
Substrate Depth(ft):	2.1	3.0

Backwatered?: No

Baffles Present: No

Embedded?: Yes

Embedded Depth(ft): 2.1

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 1.1

Culvert Gradient: 1.50%

Max Slope:

Max Slope Length:

Culvert Observations:

Culvert gradient gray
Culvert is too short
Culvert is poorly aligned
Mechanical damage or joints parting

Stream Measurements

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

Stream Slope(deg.):	0.12
Stream Flow Stage:	Medium

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Upstream ordinary high water	40.0	4.70
Upstream ordinary high water	70.0	3.80
Upstream ordinary high water	91.0	4.20

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
D/S Grade Ctrl (Thalweg) (GP)	0.00	97.85
D/S Water Surface Elev	0.00	98.43
D/S Water Surface Elev	16.00	98.69
D/S Tailcrest or 1st Thalweg (Tailwater control)	16.00	98.12
D/S Water Surface Elev	18.00	98.71
Max Pool Depth (max pool)	18.00	97.90
Outlet Invert (invert on substrate)	20.00	97.95
D/S Water Surface Elev (outlet water surface)	20.00	98.71
Outlet Culvert Top	20.00	100.03
Road Elev	45.00	102.47
Inlet Culvert Top	70.30	100.76
U/S Water Surface Elev (inlet water surface)	70.30	98.77
Inlet Culvert Invert (invert on substrate)	70.30	98.60
U/S Thalweg (Tailcrest) (GP at top of riffle)	77.30	99.09
U/S Water Surface Elev	77.30	99.56
U/S Water Surface Elev	86.30	100.08
U/S Grade Ctrl (Thalweg) (GP at step pool)	86.30	99.48
U/S Water Surface Elev (water surface for gradient)	94.30	100.56
U/S Water Surface Elev (water surface for gradient)	163.30	100.64

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.