Lower Mississippi-Helena -- Cataloging Unit 08020100

• Lower Mississippi - St. Francis Subregion 0802
  
• Lower Mississippi Region 08 (There are 82 cataloging units in this region.)
  The state composition by area is 60.3% Arkansas, 39.7% Mississippi.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 1601.3 km² ( 618.5 mi² ) [% in USA = 10.47, % in Region = 12.20]
  The area from the USGS is 566 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 713)

  IV. Elevation Analysis

  This analysis is based on 640044 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 51.1 m ( 167.6 ft ) [% in USA = 8.43, % in Region = 40.24]
  The elevation standard deviation is 11.7 m ( 38.4 ft ) [% in USA = 5.45, % in Region = 32.93]
  The coefficient of variation is 22.9 %.
  The vertical relief is 82.9 m ( 272.0 ft ) [% in USA = 6.82, % in Region = 34.15]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	35.0	39.0	44.1	45.5	47.0	49.0	51.0	54.0	56.7	59.0	117.9
  feet	114.8	128.0	144.7	149.3	154.2	160.8	167.3	177.2	186.0	193.6	386.8

  

  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	1357.1	843.4	0.847	1.364	98.91	92.68
  Intermittent Shoreline	9.6	6.0	0.006	0.010	79.30	79.27
  Perennial Streams	76.2	47.4	0.048	0.077	16.30	6.10
  Intermittent Streams	406.5	252.7	0.254	0.408	38.56	34.15
  Canals	74.8	46.5	0.047	0.075	84.08	52.44
  1° roads	0.0	0.0	0.000	0.000	30.84	7.32
  2° roads	5.8	3.6	0.004	0.006	19.71	4.88
  3° roads	43.8	27.2	0.027	0.044	28.14	2.44
  4° roads	1479.6	919.6	0.924	1.487	30.79	24.39
  Total Roads	1529.2	950.4	0.955	1.537	27.90	15.85
  Railroads	30.2	18.8	0.019	0.030	28.66	8.54
  Pipes and Powerlines	9.5	5.9	0.006	0.010	18.52	6.10

  
  Of the natural water in this HUC, 22.50% (by length) is intermittent [% in USA = 27.10, % in Region = 29.27]

  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