Lower Big Sioux -- Cataloging Unit 10170203

• Big Sioux Accounting Unit 101702
  
• Missouri-Big Sioux Subregion 1017
  
• Missouri Region 10 (There are 310 cataloging units in this region.)
  The state composition by area is 66.6% South Dakota, 18.1% Iowa, 15.3% Minnesota.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 8806.8 km² ( 3401.8 mi² ) [% in USA = 96.83, % in Region = 93.55]
  The area from the USGS is 3110 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 985)

  IV. Elevation Analysis

  This analysis is based on 3514503 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 460.2 m ( 1509.8 ft ) [% in USA = 54.19, % in Region = 21.61]
  The elevation standard deviation is 51.3 m ( 168.3 ft ) [% in USA = 39.65, % in Region = 30.00]
  The coefficient of variation is 11.1 %.
  The vertical relief is 278.0 m ( 912.1 ft ) [% in USA = 39.70, % in Region = 31.94]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	332.0	391.6	411.9	428.5	444.2	464.0	482.9	494.1	506.9	521.1	610.0
  feet	1089.2	1284.8	1351.4	1405.8	1457.3	1522.3	1584.3	1621.0	1663.0	1709.6	2001.3

  

  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	374.9	233.0	0.043	0.068	32.59	45.48
  Intermittent Shoreline	147.1	91.5	0.017	0.027	90.48	80.00
  Perennial Streams	1755.6	1091.1	0.199	0.321	39.84	67.10
  Intermittent Streams	4995.4	3104.6	0.567	0.913	76.55	51.61
  Canals	53.1	33.0	0.006	0.010	60.26	60.97
  1° roads	269.2	167.3	0.031	0.049	80.15	91.94
  2° roads	108.1	67.2	0.012	0.020	30.41	31.29
  3° roads	776.4	482.5	0.088	0.142	68.78	88.39
  4° roads	11822.5	7347.7	1.342	2.160	68.21	94.52
  Total Roads	12976.2	8064.8	1.473	2.371	66.75	94.52
  Railroads	704.8	438.0	0.080	0.129	78.97	90.65
  Pipes and Powerlines	530.5	329.7	0.060	0.097	79.30	93.23

  
  Of the natural water in this HUC, 70.71% (by length) is intermittent [% in USA = 70.49, % in Region = 42.26]

  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