Fish Passage Site 20203723

Coordinates (dec. deg.): 60.11335°, -149.44391°
Legal Description: S001S001W03
Region: South Central
Road Name: Driveway

Datum: NAD83
Quad Name / ITM: Seward A-7
AWC Stream #: 231-30-10070-2009
Stream Name: Schafller Creek

Elevation:

Site Comments: Creek runs through a driveway culvert and parallels 2nd Avenue. Site 116_2007 is about 30 feet downstream and site 118_2007 is about 30 feet upstream.

Survey Date: Jul 21, 2017

Survey KEN17-117_2007

Observers: Jeff Sires, Luke Violette, Louis Mitchell

Overall Fish Passage Rating: Green

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Damage associated with ice problems

Comments: KWFRES_17_13. Culvert assessment submitted by the Kenai Watershed Forum. Creek is ditched upstream and downstream from culvert. Multiple culverts both upstream and downstream from site. Used downstream gradient and OHWs below last culvert where creek is about as natural as it gets for this creek for constriction ratio and stream gradient. Site is embedded, unknown if it's natural deposition, road fill pushed into the creek, or if substrate was placed. Culvert set to within 1% of stream gradient, rated Green.

Culvert Measurements

ID: 1 Structure Type: Circular pipe (Corrugated steel) Fish Passage Rating: Green
 
Length(ft): 29.8
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 0.5
Corrugation Width(in.): 3.0
Condition Rating(1-5): 3
Approach Angle: 0.0
Sedimentation At Inlet: No
Inlet Substrate: Cobble
Outlet Substrate: Cobble
InletOutlet
Width(ft):2.5 2.41
Height(ft):2.0 1.64
Apron Length(ft):
Water Depth(ft): 0.18
Rustline Height(ft):0.5
Substrate Depth(ft):0.5 0.75
Backwatered?: No
Baffles Present: No
Embedded?: Yes
Embedded Depth(ft): 0.5
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 1.03
Culvert Gradient: 2.45%
Max Slope:
Max Slope Length:
 

Comments: Water surface gradient through culvert 1.68%, substrate gradient through culvert 1.68%. Inlet and outlet shows some signs of damage.
  Culvert Observations:
  1. Damage associated with ice problems

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:CobbleCobble
Subdominant:GravelGravel
Stream Slope(deg.):1.97
Stream Flow Stage:Low
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 10.0 2.75
Downstream ordinary high water 20.0 2.25
Downstream ordinary high water 30.0 1.92
Upstream ordinary high water 5.0 3.00
Upstream ordinary high water 10.0 3.75
Upstream ordinary high water 15.0 7.30

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 101.48
D/S Thalweg (survey uses TBM 2 in driveway series elevation 101.84, TBM 1 = 100.) 0.00 97.64
D/S Water Surface Elev 0.00 97.99
D/S Thalweg 15.50 98.13
D/S Water Surface Elev 15.50 98.40
D/S Grade Ctrl (Thalweg) 30.50 98.74
D/S Water Surface Elev 30.50 98.96
D/S Thalweg 33.50 98.72
D/S Water Surface Elev 33.50 98.98
D/S Water Surface Elev 34.50 98.97
Outlet Invert (On substrate) 34.50 98.79
Outlet Culvert Top 34.50 100.47
Inlet Culvert Top 64.30 101.20
Inlet Culvert Invert (On substrate) 64.30 99.29
U/S Water Surface Elev 64.30 99.47
U/S Water Surface Elev 65.30 99.41
U/S Thalweg 65.30 99.20
U/S Grade Ctrl (Thalweg) 73.30 99.50
U/S Water Surface Elev 73.30 99.84
U/S Grade Ctrl (Thalweg) 89.30 100.26
U/S Water Surface Elev 89.30 100.42
U/S Water Surface Elev 96.30 100.35
U/S Thalweg 96.30 99.66

Notes:

  1. River distance is measured continuously throughout the survey reach along the thalweg of the stream.
  2. Measured from each end of the crossing along the thalweg of the stream.

Fish Sampling Efforts

Gear Type: Minnow Trap (A) Trap Duration(h): 0.3
Comments: Trap set about 20 feet upstream.
 
Gear Type: Minnow Trap (B) Trap Duration(h): 0.3
Comments: Trap set about 60 feet downstream below downstream culvert 116_2007.

Fish Observations

No fish observations occurred during this survey.

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