Fish Passage Improvement site 20100718

Fish Passage Site 20100718

Coordinates (dec. deg.): 61.99013°, -145.35716°
Legal Description: C002N001W02
Region: South Central
Road Name: Richardson Highway

Datum: NAD83
Quad Name / ITM: Valdez D-4
AWC Stream #:
Stream Name: Yetna 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-RICH34

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:

Culvert is poorly aligned

Comments: This assessment was performed by the Copper River Watershed Project. Large rip rap rocks at inlet and outlet

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Structural steel plate)

Fish Passage Rating: Green

Length(ft): 121.5

Inlet Type: Mitered

Outlet Type: Mitered

Corrugation Depth(in.): 2.0

Corrugation Width(in.): 6.0

Condition Rating(1-5): 3

Approach Angle: 35.0

Sedimentation At Inlet: No

Inlet Substrate: Sand

Outlet Substrate: Sand

	Inlet	Outlet
Width(ft):	5.85	5.85
Height(ft):	5.88	5.78
Apron Length(ft):
Water Depth(ft):		1.21
Rustline Height(ft):	1.75
Substrate Depth(ft):

Backwatered?: No

Baffles Present: No

Embedded?: No

Outfall Height: 0.0

Outfall Type: At Stream Grade

Constriction Ratio: 1.17

Culvert Gradient: 0.98%

Max Slope:

Max Slope Length:

Comments: Rip rap at outlet causes an outlet riffle, but also looks like it hold back water through most of the culvert. Rip rap at inlet causing an a small hydralic jump in the miter. Stream slope taken with clinometer.

Culvert Observations:

Culvert is poorly aligned

Stream Measurements

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

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

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Downstream ordinary high water		5.50
Downstream ordinary high water		7.20
Downstream ordinary high water		5.60
Upstream ordinary high water		5.10
Upstream ordinary high water		5.00
Upstream ordinary high water		4.70
Upstream ordinary high water		5.20

Elevations

Locator ID	River Distance (ft)¹	Relative Elevation (ft)
Road Elev		107.78
D/S Grade Ctrl (Thalweg)	0.00	86.14
D/S Water Surface Elev	0.00	87.33
D/S Tailcrest or 1st Thalweg	99.00	88.38
D/S Water Surface Elev	99.00	88.88
Max Pool Depth	122.70	86.76
Outlet Pool Water Elev	122.70	88.92
D/S Water Surface Elev	126.60	88.94
Outlet Invert	126.60	87.73
Outlet Culvert Top	135.20	93.50
D/S Water Surface Elev	135.20	89.04
D/S Thalweg (below top of culvert)	135.20	87.72
U/S Thalweg (below top of culvert)	240.00	88.49
U/S Water Surface Elev	240.00	89.19
Inlet Culvert Top	240.00	94.37
U/S Water Surface Elev	248.60	89.59
Inlet Culvert Invert	248.60	88.92
U/S Water Surface Elev	252.00	89.88
U/S Grade Ctrl (Thalweg)	252.00	89.36
U/S Grade Ctrl (Thalweg)	272.00	89.99
U/S Water Surface Elev	272.00	90.84
U/S Water Surface Elev	323.00	90.88
U/S Grade Ctrl (Thalweg)	323.00	88.56
U/S Grade Ctrl (Thalweg)	431.00	90.97
U/S Water Surface Elev	431.00	91.56

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): 19.0
Comments: 3 traps set upstream, no fish caught or observed

Gear Type: Minnow Trap (B)		Trap Duration(h): 19.0
Comments: 3 traps set downstream, no fish caught or observed

Fish Observations

No fish observations occurred during this survey.

Photos

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