Amistad Reservoir -- Cataloging Unit 13040212

• Rio Grande-Amistad Accounting Unit 130402
  
• Rio Grande-Amistad Subregion 1304
  
• Rio Grande Region 13 (There are 70 cataloging units in this region.)
  The state composition by area is 100.0% Texas.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 1097.2 km² ( 423.8 mi² ) [% in USA = 5.16, % in Region = 2.86]
  The area from the USGS is 410 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 72)

  IV. Elevation Analysis

  This analysis is based on 438324 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 468.0 m ( 1535.4 ft ) [% in USA = 54.81, % in Region = 8.57]
  The elevation standard deviation is 85.1 m ( 279.2 ft ) [% in USA = 52.11, % in Region = 12.86]
  The coefficient of variation is 18.2 %.
  The vertical relief is 353.0 m ( 1158.1 ft ) [% in USA = 44.81, % in Region = 10.00]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	323.0	362.3	392.4	413.3	431.0	462.3	488.0	517.8	547.5	581.4	676.0
  feet	1059.7	1188.6	1287.4	1356.0	1414.0	1516.7	1601.0	1698.8	1796.2	1907.5	2217.8

  

  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	368.5	229.1	0.336	0.540	92.28	98.57
  Intermittent Shoreline	0.5	0.3	0.000	0.001	42.92	1.43
  Perennial Streams	8.0	5.0	0.007	0.012	6.35	40.00
  Intermittent Streams	322.9	200.7	0.294	0.474	44.15	17.14
  Canals	0.0	0.0	0.000	0.000	35.62	40.00
  1° roads	0.0	0.0	0.000	0.000	30.84	47.14
  2° roads	62.2	38.7	0.057	0.091	87.73	98.57
  3° roads	3.5	2.2	0.003	0.005	5.87	17.14
  4° roads	1026.3	637.8	0.935	1.505	31.45	60.00
  Total Roads	1091.9	678.6	0.995	1.601	30.13	61.43
  Railroads	73.1	45.4	0.067	0.107	71.48	98.57
  Pipes and Powerlines	0.0	0.0	0.000	0.000	8.67	24.29

  
  Of the natural water in this HUC, 46.20% (by length) is intermittent [% in USA = 48.32, % in Region = 4.29]

  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