Imperial Reservoir -- Cataloging Unit 15030104

• Lower Colorado Accounting Unit 150301
  
• Lower Colorado Subregion 1503
  
• Lower Colorado Region 15 (There are 85 cataloging units in this region.)
  The state composition by area is 56.4% California, 43.6% Arizona.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 8897.5 km² ( 3436.8 mi² ) [% in USA = 96.97, % in Region = 98.82]
  The area from the USGS is 3320 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 641)

  IV. Elevation Analysis

  This analysis is based on 3554135 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 273.9 m ( 898.6 ft ) [% in USA = 35.58, % in Region = 3.53]
  The elevation standard deviation is 159.5 m ( 523.3 ft ) [% in USA = 65.94, % in Region = 16.47]
  The coefficient of variation is 58.2 %.
  The vertical relief is 1172.9 m ( 3848.1 ft ) [% in USA = 69.87, % in Region = 27.06]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	53.0	90.9	122.0	169.0	207.6	244.0	302.0	349.6	399.2	483.0	1225.9
  feet	173.9	298.2	400.3	554.5	681.1	800.5	990.8	1147.0	1309.7	1584.6	4021.9

  

  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	952.0	591.7	0.107	0.172	58.50	96.47
  Intermittent Shoreline	8.0	5.0	0.001	0.001	53.06	41.18
  Perennial Streams	88.6	55.1	0.010	0.016	7.01	49.41
  Intermittent Streams	6889.1	4281.6	0.774	1.246	92.14	64.71
  Canals	1156.7	718.9	0.130	0.209	94.41	97.65
  1° roads	58.0	36.0	0.007	0.010	50.36	60.00
  2° roads	122.9	76.4	0.014	0.022	33.16	65.88
  3° roads	142.3	88.4	0.016	0.026	17.20	45.88
  4° roads	5282.8	3283.3	0.594	0.955	11.04	41.18
  Total Roads	5606.0	3484.1	0.630	1.014	10.99	42.35
  Railroads	111.5	69.3	0.013	0.020	22.88	54.12
  Pipes and Powerlines	369.7	229.8	0.042	0.067	62.96	84.71

  
  Of the natural water in this HUC, 86.89% (by length) is intermittent [% in USA = 85.60, % in Region = 16.47]

  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