Fish Passage Improvement site 20601539

Fish Passage Site 20601539

Coordinates (dec. deg.): 61.06987°, -151.17418°
Legal Description: S011N011W02
Region: South Central
Road Name: Tyonek Timber Road

Datum: NAD83
Quad Name / ITM: Tyonek A-4
AWC Stream #: 247-20-10030-2001
Stream Name: Bunka Lake outlet

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 TYCS1-TY013

site photos

Observers: Cecil Rich, Michael Anderson, Joe Buckwalter

Overall Fish Passage Rating: Gray

Tidal: No
Backwatered: No

Step Pools:
Construction Year:

Comments: Datum = WGS84. GPS accuracy 18.1 ft

Culvert Measurements

ID: 1

Structure Type: Circular pipe (Corrugated Metal)

Fish Passage Rating:

Length(ft): 30.7

Inlet Type: Projecting

Outlet Type:

Corrugation Depth(in.): 0.5

Corrugation Width(in.): 3.0

Condition Rating(1-5):

Approach Angle:

Sedimentation At Inlet:

Inlet Substrate: Gravel

Outlet Substrate: None

	Inlet	Outlet
Width(ft):	2.9	3.0
Height(ft):
Apron Length(ft):
Water Depth(ft):	0.5	0.15
Rustline Height(ft):
Substrate Depth(ft):	0.0	0.0

Backwatered?:

Baffles Present: No

Embedded?: No

Outfall Height:

Outfall Type:

Constriction Ratio:

Culvert Gradient:

Max Slope:

Max Slope Length:

Culvert Observations:

Improper bedding

Stream Measurements

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

Stream Slope(deg.):
Stream Flow Stage:

Stream Width Type	Distance From Crossing (ft)	Stream Width (ft)
Downstream ordinary high water	46.0	8.20
Downstream ordinary high water	95.0	5.00
Upstream ordinary high water	5.0	14.70

Elevations

Locator ID	Culvert Number	River Distance (ft)¹	Distance From Crossing (ft)²	Relative Elevation (ft)
D/S Tailcrest or 1st Thalweg				94.20
D/S Thalweg		0.00	95.0	92.79
D/S Water Surface Elev		0.00	95.0	92.89
D/S OHW Elev		0.00	95.0	93.05
D/S Thalweg		49.00	46.0	93.42
D/S Water Surface Elev		49.00	46.0	93.67
D/S Thalweg		82.50	12.5	92.94
OHW Left Bank		92.00	3.0	94.48
OHW Left Bank		93.00	2.0	94.84
Max Pool Depth		93.00	2.0	93.58
Outlet Rustline Height	1	95.00	0.0	95.50
Outlet Thalweg	1	95.00	0.0	93.90
Outlet Culvert Top	1	95.00	0.0	97.98
Road Elev		110.00		99.56
Road Elev		110.00		99.70
Inlet Culvert Top	1	125.00	0.0	98.41
Inlet Rustline Height	1	125.00	0.0	96.40
Inlet Thalweg (inlet control)	1	125.00	0.0	95.45
U/S Thalweg	1	126.00	1.0	96.15
U/S Water Surface Elev	1	128.00	3.0	96.52
U/S OHW elevation	1	128.00	3.0	96.63
U/S Thalweg	1	130.00	5.0	95.57
U/S Thalweg	1	130.80	5.8	95.57
U/S Headwater		171.00	46.0	93.87

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, 1/4 in. Mesh (A)		Trap Duration(h): 1.5

Gear Type: Minnow Trap, 1/4 in. Mesh (B)		Trap Duration(h): 1.75

Fish Observations

Species: juvenile coho salmon		Life History: Anadromous
Total Fish Observed: 6	Fish Measured: 3	Fork Lengths (mm) Min: 78 Max: 97 Mean: 86
Collected/Observed by Gear Type: Downstream Minnow Trap, 1/4 in. Mesh (2) Upstream Minnow Trap, 1/4 in. Mesh (4)

Photos

Questions or comments about this report can be directed to dfg.dsf.webmaster@alaska.gov