Illinois -- Cataloging Unit 11110103

• Robert S Accounting Unit 111101
  
• Lower Arkansas Subregion 1111
  
• Arkansas-White-Red Region 11 (There are 173 cataloging units in this region.)
  The state composition by area is 55.3% Oklahoma, 44.7% Arkansas.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 4282.5 km² ( 1654.2 mi² ) [% in USA = 69.11, % in Region = 66.47]
  The area from the USGS is 1620 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 1455)

  IV. Elevation Analysis

  This analysis is based on 1710230 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 334.0 m ( 1095.8 ft ) [% in USA = 42.92, % in Region = 41.04]
  The elevation standard deviation is 64.8 m ( 212.6 ft ) [% in USA = 45.76, % in Region = 51.45]
  The coefficient of variation is 19.4 %.
  The vertical relief is 426.8 m ( 1400.2 ft ) [% in USA = 49.98, % in Region = 62.43]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	152.0	243.0	274.0	304.0	331.6	335.8	357.8	365.0	386.2	406.9	578.8
  feet	498.7	797.2	898.9	997.4	1087.9	1101.7	1173.9	1197.5	1267.0	1335.0	1898.9

  

  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	346.1	215.1	0.081	0.130	48.89	56.07
  Intermittent Shoreline	0.8	0.5	0.000	0.000	34.49	19.08
  Perennial Streams	1145.5	711.9	0.267	0.430	51.73	80.35
  Intermittent Streams	2442.3	1517.9	0.570	0.918	76.88	66.47
  Canals	1.9	1.2	0.000	0.001	41.17	62.43
  1° roads	22.5	14.0	0.005	0.008	48.32	52.60
  2° roads	322.6	200.5	0.075	0.121	95.36	98.27
  3° roads	541.2	336.4	0.126	0.203	80.01	82.66
  4° roads	6248.1	3883.2	1.459	2.348	76.27	86.13
  Total Roads	7134.4	4434.1	1.666	2.681	78.78	89.60
  Railroads	127.8	79.4	0.030	0.048	39.60	31.21
  Pipes and Powerlines	385.7	239.7	0.090	0.145	91.57	95.95

  
  Of the natural water in this HUC, 62.09% (by length) is intermittent [% in USA = 63.05, % in Region = 39.88]

  VI. Other sites

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

  ---

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