Lower Mississippi-Greenville -- Cataloging Unit 08030100

• Lower Mississippi - Yazoo Subregion 0803
  
• Lower Mississippi Region 08 (There are 82 cataloging units in this region.)
  The state composition by area is 46.5% Mississippi, 31.7% Arkansas, 21.9% Louisiana.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 1785.2 km² ( 689.6 mi² ) [% in USA = 13.60, % in Region = 18.29]
  The area from the USGS is 629 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 759)

  IV. Elevation Analysis

  This analysis is based on 712364 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 31.9 m ( 104.7 ft ) [% in USA = 6.49, % in Region = 30.49]
  The elevation standard deviation is 6.9 m ( 22.6 ft ) [% in USA = 3.03, % in Region = 21.95]
  The coefficient of variation is 21.6 %.
  The vertical relief is 31.9 m ( 104.7 ft ) [% in USA = 2.70, % in Region = 15.85]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	15.0	22.4	26.5	28.0	30.0	30.0	33.0	36.0	38.7	42.0	46.9
  feet	49.2	73.5	86.9	91.9	98.4	98.4	108.3	118.1	127.0	137.8	153.9

  

  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	1708.4	1061.8	0.957	1.540	99.10	93.90
  Intermittent Shoreline	90.3	56.1	0.051	0.081	96.92	96.34
  Perennial Streams	64.8	40.3	0.036	0.058	14.07	4.88
  Intermittent Streams	239.2	148.6	0.134	0.216	23.64	19.51
  Canals	111.5	69.3	0.062	0.101	87.73	58.54
  1° roads	6.3	3.9	0.004	0.006	46.09	35.37
  2° roads	25.3	15.7	0.014	0.023	33.68	13.41
  3° roads	77.2	48.0	0.043	0.070	41.83	4.88
  4° roads	1366.3	849.2	0.765	1.231	20.18	14.63
  Total Roads	1475.1	916.8	0.826	1.330	20.51	8.54
  Railroads	29.8	18.5	0.017	0.027	26.20	6.10
  Pipes and Powerlines	25.1	15.6	0.014	0.023	29.84	12.20

  
  Of the natural water in this HUC, 15.67% (by length) is intermittent [% in USA = 20.46, % in Region = 17.07]

  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