Grand Wash -- Cataloging Unit 15010006

• Lower Colorado-Lake Mead Subregion 1501
  
• Lower Colorado Region 15 (There are 85 cataloging units in this region.)
  The state composition by area is 89.9% Arizona, 10.1% Nevada.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 2437.9 km² ( 941.7 mi² ) [% in USA = 31.98, % in Region = 23.53]
  The area from the USGS is 922 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 261)

  IV. Elevation Analysis

  This analysis is based on 974230 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 1241.2 m ( 4072.1 ft ) [% in USA = 77.83, % in Region = 42.35]
  The elevation standard deviation is 419.4 m ( 1376.0 ft ) [% in USA = 92.85, % in Region = 88.24]
  The coefficient of variation is 33.8 %.
  The vertical relief is 2196.0 m ( 7204.6 ft ) [% in USA = 91.99, % in Region = 82.35]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	295.8	661.9	820.0	958.1	1137.5	1274.9	1385.0	1498.4	1633.7	1811.0	2491.8
  feet	970.5	2171.6	2690.3	3143.3	3731.9	4182.7	4543.9	4916.0	5359.8	5941.5	8175.1

  

  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	27.3	17.0	0.011	0.018	13.41	68.24
  Intermittent Shoreline	0.0	0.0	0.000	0.000	26.95	16.47
  Perennial Streams	3.3	2.0	0.001	0.002	3.79	27.06
  Intermittent Streams	2278.3	1416.0	0.935	1.504	97.25	85.88
  Canals	0.0	0.0	0.000	0.000	35.62	30.59
  1° roads	0.0	0.0	0.000	0.000	30.84	48.24
  2° roads	0.0	0.0	0.000	0.000	15.35	29.41
  3° roads	0.0	0.0	0.000	0.000	4.07	9.41
  4° roads	1166.2	724.8	0.478	0.770	6.49	21.18
  Total Roads	1166.2	724.8	0.478	0.770	5.45	15.29
  Railroads	0.0	0.0	0.000	0.000	12.60	34.12
  Pipes and Powerlines	0.6	0.3	0.000	0.000	9.43	11.76

  
  Of the natural water in this HUC, 98.68% (by length) is intermittent [% in USA = 96.73, % in Region = 67.06]

  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