Fish Passage Improvement site 20103768

Fish Passage Site 20103768

Coordinates (dec. deg.): 61.99135°, -145.35811°
Legal Description: C003N001W35
Region: South Central
Road Name: Driveway

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

Elevation:

Site Comments: Driveway off of Richardson Highway at about milepost 104.1

Survey Date: Sep 19, 2016

Survey CRWP17-Rich34.1

site photos

Observers: Kirsti Jurica, Hoots Witsoe

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:

Site Observations:

Culvert gradient red
Sediment accumulation
Culvert sagging in middle

Comments: Culvert assessment performed and submitted by the Copper River Watershed Project. Sedimentation occurring in pipe and at outlet.

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated steel)

Fish Passage Rating: Red

Length(ft): 48.0

Inlet Type: Projecting

Outlet Type: Projecting

Corrugation Depth(in.): 1.0

Corrugation Width(in.): 3.0

Condition Rating(1-5): 4

Approach Angle: 15.0

Sedimentation At Inlet: No

Inlet Substrate: Gravel

Outlet Substrate: Gravel

	Inlet	Outlet
Width(ft):	6.2	6.1
Height(ft):	5.36	4.0
Apron Length(ft):
Water Depth(ft):		0.42
Rustline Height(ft):	0.65
Substrate Depth(ft):	0.6	1.7

Backwatered?: No

Baffles Present: No

Embedded?: No

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 0.95

Culvert Gradient: 3.14%

Max Slope:

Max Slope Length:

Comments: Outlet substrate maybe greater than 1.7 feet, unsure if they hit bottom. Water surface gradient through cuvlert 0.27%, substrate gradient through culvert 0.31%.

Culvert Observations:

Culvert gradient red
Sediment accumulation
Culvert sagging in middle

Stream Measurements

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

Stream Slope(deg.):	0.5
Stream Flow Stage:	Medium

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Downstream ordinary high water		6.80
Downstream ordinary high water		6.00
Downstream ordinary high water		6.20
Upstream ordinary high water		6.60
Upstream ordinary high water		6.80
Upstream ordinary high water		6.20

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
Road Elev		100.00
D/S Grade Ctrl (Thalweg)	0.00	91.14
D/S Water Surface Elev	0.00	91.60
Outlet Pool Water Elev	66.00	91.88
Max Pool Depth	66.00	90.58
D/S Tailcrest or 1st Thalweg (Head of outlet riffle, no outlet pool)	82.00	92.22
D/S Water Surface Elev	82.00	92.45
D/S Water Surface Elev	84.00	92.48
Outlet Invert (on substrate)	84.00	92.06
Outlet Culvert Top	84.00	96.06
Inlet Culvert Top	132.00	97.57
U/S Water Surface Elev	132.00	92.61
Inlet Culvert Invert (on substrate)	132.00	92.21
U/S Grade Ctrl (Thalweg)	143.00	92.50
U/S Water Surface Elev	143.00	92.93
U/S Water Surface Elev	204.00	93.01
U/S Grade Ctrl (Thalweg)	204.00	92.27

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.