Fish Passage Site 20300961

Coordinates (dec. deg.): 60.77885°, -149.22116°
Legal Description: S008N001E14
Region: South Central
Road Name: Seward Highway

Datum: NAD83
Quad Name / ITM: Seward D-6
AWC Stream #:
Stream Name: Lyon Creek

Elevation:

Site Comments: None

Survey Date: Oct 03, 2001

Survey KPCS1-EK095

Observers: Cecil Rich, James Maple, Tom Sigurdsson

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools:
Construction Year:


Comments: large accumulation of woody debris on debris rack at inlet, particuarly on left culvert has caused much aggredation. Area around crossing is rip-rapped heavily.

Culvert Measurements

ID: 1 Structure Type: Closed-bottom arch (Strutural Metal Plate) Fish Passage Rating:
 
Length(ft): 139.0
Inlet Type: Mitered
Outlet Type:
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: Boulder
Outlet Substrate: Gravel
InletOutlet
Width(ft):16.2 16.5
Height(ft):9.02 9.35
Apron Length(ft):
Water Depth(ft):0.88 0.54
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.08
Outfall Type:
Constriction Ratio: 0.89
Culvert Gradient: 2.26%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Woody Debris
ID: 2 Structure Type: Closed-bottom arch (Strutural Metal Plate) Fish Passage Rating:
 
Length(ft): 140.5
Inlet Type: Mitered
Outlet Type:
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5):
Approach Angle:
Sedimentation At Inlet:
Inlet Substrate: Boulder
Outlet Substrate: Gravel
InletOutlet
Width(ft):16.5 16.5
Height(ft):10.43 9.71
Apron Length(ft):
Water Depth(ft):1.88 1.67
Rustline Height(ft):
Substrate Depth(ft):0.0 0.0
Backwatered?:
Baffles Present: No
Embedded?: No
Outfall Height: 0.08
Outfall Type:
Constriction Ratio: 0.89
Culvert Gradient: 1.54%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Sediment accumulation

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:GravelGravel
Subdominant:BoulderBoulder
Stream Slope(deg.):
Stream Flow Stage:
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 2.0 41.00
Downstream ordinary high water 50.0 48.40
Downstream ordinary high water 100.0 41.00
Upstream ordinary high water 5.0 31.30
Upstream ordinary high water 50.0 58.30
Upstream ordinary high water 100.0 15.50

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
D/S Water Surface Elev 0.00 100.0 85.12
D/S OHW Elev 0.00 100.0 85.90
D/S Thalweg 0.00 100.0 83.90
D/S Thalweg 50.00 50.0 84.50
D/S Water Surface Elev 50.00 50.0 86.15
D/S OHW Elev 50.00 50.0 87.02
OHW Left Bank 95.00 5.0 88.83
Max Pool Depth 95.00 5.0 86.37
D/S Thalweg 95.00 5.0 86.37
OHW Left Bank 95.00 5.0 87.71
D/S Tailcrest or 1st Thalweg 98.00 2.0 86.33
D/S Water Surface Elev 98.00 2.0 87.33
OHW Left Bank 98.00 2.0 88.30
Outlet Rustline Height 1 100.00 0.0 88.37
Outlet Invert (used thalweg) 2 100.00 0.0 86.12
Outlet Thalweg 2 100.00 0.0 86.12
Outlet Rustline Height 2 100.00 0.0 88.25
Outlet Invert (used thalweg) 1 100.00 0.0 86.50
Outlet Thalweg 1 100.00 0.0 86.50
Outlet Culvert Top 2 100.00 0.0 95.83
Outlet Culvert Top 1 100.00 0.0 95.85
Road Elev 169.50 102.45
Road Elev 169.50 104.06
Inlet Culvert Top 1 239.00 0.0 98.66
Inlet Culvert Top 2 239.00 0.0 98.72
Inlet Culvert Invert 2 239.00 0.0 88.29
Inlet Thalweg 2 239.00 0.0 88.29
Inlet Culvert Invert 1 239.00 0.0 89.64
Inlet Thalweg 1 239.00 0.0 89.64
Inlet Rustline Height 1 239.00 0.0 90.77
U/S Thalweg 1 240.00 1.0 89.62
U/S Thalweg 2 240.00 1.0 88.54
U/S Thalweg 1 244.00 5.0 89.95
U/S Water Surface Elev 1 244.00 5.0 90.33
U/S Water Surface Elev 2 244.00 5.0 90.66
U/S Thalweg 2 244.00 5.0 89.31
U/S OHW elevation 2 244.00 5.0 92.52
U/S Thalweg 1 271.70 32.7 89.45
U/S Headwater 289.00 50.0 92.58
U/S Water Surface Elev 289.00 50.0 91.41
U/S Thalweg 289.00 50.0 90.35
U/S Thalweg 339.00 100.0 90.66
U/S Water Surface Elev 339.00 100.0 91.93
U/S Headwater 339.00 100.0 92.68

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): 1.55
 
Gear Type: Minnow Trap (B) Trap Duration(h): 1.4

Fish Observations

Species: no fish collected or observed Life History: Not Applicable
Total Fish Observed: 0 Fish Measured: Fork Lengths (mm) Min: Max: Mean:
Collected/Observed by Gear Type: Downstream Minnow Trap (0)  Upstream Minnow Trap (0)  

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