Lower Mississippi-Natchez -- Cataloging Unit 08060100

• Lower Mississippi - Big Black Subregion 0806
  
• Lower Mississippi Region 08 (There are 82 cataloging units in this region.)
  The state composition by area is 51.1% Louisiana, 48.9% Mississippi.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 1698.9 km² ( 656.2 mi² ) [% in USA = 12.17, % in Region = 15.85]
  The area from the USGS is 548 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 982)

  IV. Elevation Analysis

  This analysis is based on 678213 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 21.6 m ( 70.9 ft ) [% in USA = 5.16, % in Region = 24.39]
  The elevation standard deviation is 17.7 m ( 58.1 ft ) [% in USA = 8.76, % in Region = 45.12]
  The coefficient of variation is 81.9 %.
  The vertical relief is 117.3 m ( 384.8 ft ) [% in USA = 11.65, % in Region = 58.54]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	2.0	7.0	12.0	14.0	15.0	16.0	18.7	22.0	22.0	49.5	119.3
  feet	6.6	23.0	39.4	45.9	49.2	52.5	61.4	72.2	72.2	162.4	391.4

  

  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	1431.3	889.6	0.842	1.356	98.82	91.46
  Intermittent Shoreline	8.9	5.5	0.005	0.008	77.26	76.83
  Perennial Streams	158.3	98.4	0.093	0.150	24.59	9.76
  Intermittent Streams	419.6	260.8	0.247	0.397	37.66	32.93
  Canals	78.5	48.8	0.046	0.074	83.89	51.22
  1° roads	28.4	17.7	0.017	0.027	65.28	63.41
  2° roads	35.7	22.2	0.021	0.034	43.72	23.17
  3° roads	148.3	92.2	0.087	0.140	68.31	18.29
  4° roads	1776.9	1104.4	1.046	1.683	40.12	45.12
  Total Roads	1989.3	1236.4	1.171	1.884	40.93	32.93
  Railroads	58.3	36.2	0.034	0.055	43.77	25.61
  Pipes and Powerlines	70.7	43.9	0.042	0.067	63.10	32.93

  
  Of the natural water in this HUC, 21.23% (by length) is intermittent [% in USA = 25.72, % in Region = 25.61]

  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