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Williams River

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Record: 5    Segment ID: M09-    Stream Name: Williams River

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Stream Channel  
2.1 Bankfull Width 116 ft.
2.2 Maximum Depth 4.0 ft.
2.3 Mean Depth 3.1 ft.
2.4 Floodprone Width 250 ft.
2.5 Recently Abandoned Floodplain 7.0 ft.
  Human Elevated Floodplain ft.
2.6 Width/Depth Ratio 37.9
2.7 Entrenchment Ratio 2.2
2.8 Incision Ratio - Redently Abandoned Floodplain 1.8
  Incision Ratio - Human Elevated FloodPlain 0.0
2.9 Sinuosity Low
2.10 Type of Riffles Sedimented
2.11 Riffle/Step Spacing Distance 450 ft.
2.12 Substrate Composition  
  Bedrock 0.0 %
  Boulder 2.0 %
  Cobble 28.0 %
  Course Gravel 42.0 %
  Fine Gravel 16.0 %
  Sand 12.0 %
  Silt and smaller 0.0 %
  Clay Present? No
  Percent Detritus 3.0 %
  Large Woody Debris Count 25
2.13 Average Largest Particle On  
  Bed 280 mm
  Bar 160 mm
2.14 Phase 2 Stream Type  
  Stream Type B
  Bed Material Gravel
  Subclass Slope c
  Dominant Bed Form Plane Bed
  SubDominant Bed Form Riffle-Pool
  Field Measured Slope
  Phase 1 Stream Type  
  Stream Type C
  Dominant Bed Material Gravel
  Subclass Slope None
  Bed Form Riffle-Pool
  Sub-reach Stream Type  
  Reference Stream Type
  Reference Bed Material
  Reference Subclass Slope
  Reference Bedform
  Were Channel Dimensions Significantly Changed By Major Flooding Yes
  Were channel dimensions significantly changed by human alteration associated with flood recovery efforts (e.g., reshaping of banks by yellow machines)? No
  Channel Enlargement 0 %
  Comments Cross-section was collected at the only riffle in the lower portion of the reach. Typical valley width was 400-450', not the 750' at the cross-section site. Channel geometry was very consistent throughout reach. Bedform departure to Plane Bed due to historic straightening and armoring and deep incision.