Lower Cottonwood -- Cataloging Unit 18020102

• Lower Sacramento Accounting Unit 180201
  
• Upper Sacramento Subregion 1802
  
• California Region 18 (There are 135 cataloging units in this region.)
  The state composition by area is 100.0% California.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 441.3 km² ( 170.5 mi² ) [% in USA = 1.09, % in Region = 7.41]
  The area from the USGS is 328 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 111)

  IV. Elevation Analysis

  This analysis is based on 176927 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 202.4 m ( 664.0 ft ) [% in USA = 24.59, % in Region = 16.30]
  The elevation standard deviation is 50.4 m ( 165.4 ft ) [% in USA = 39.08, % in Region = 2.96]
  The coefficient of variation is 24.9 %.
  The vertical relief is 406.4 m ( 1333.3 ft ) [% in USA = 48.74, % in Region = 4.44]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	121.0	152.0	183.0	183.0	183.0	183.0	183.0	212.5	244.0	279.6	527.4
  feet	397.0	498.7	600.4	600.4	600.4	600.4	600.4	697.2	800.5	917.3	1730.3

  

  V. Map Line Analysis

  Note- percentiles are for the feature density, not for the raw total lengths.
  

  line type	km	mi	km/km²	mi/mi²	% in USA	% in Region
  Perennial Shoreline	5.4	3.4	0.012	0.020	14.59	15.56
  Intermittent Shoreline	13.6	8.4	0.031	0.049	94.74	94.81
  Perennial Streams	84.2	52.4	0.191	0.307	38.32	34.81
  Intermittent Streams	289.7	180.0	0.656	1.056	84.60	85.93
  Canals	30.5	18.9	0.069	0.111	88.73	82.96
  1° roads	19.6	12.2	0.045	0.072	87.54	78.52
  2° roads	0.0	0.0	0.000	0.000	15.35	73.33
  3° roads	1.1	0.7	0.003	0.004	5.54	5.93
  4° roads	648.7	403.2	1.470	2.365	76.93	68.15
  Total Roads	669.4	416.1	1.517	2.441	69.82	67.41
  Railroads	21.5	13.3	0.049	0.078	58.03	71.85
  Pipes and Powerlines	61.8	38.4	0.140	0.225	98.82	97.78

  
  Of the natural water in this HUC, 77.18% (by length) is intermittent [% in USA = 75.94, % in Region = 82.96]

  VI. Other sites

  • EPA- Surf Your Watershed - Index of Watershed Indicators
  • USGS- Science in Your Watershed - Selected Realtime Streamflow Stations
  • CTIC- Known Your Watershed

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  1999 SEPT 4, Last updated on 2003 JAN 23
  
  D.L. Gustafson, dlg@rapid.msu.montana.edu