Rock -- Cataloging Unit 10170204

• 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 55.2% Minnesota, 44.8% Iowa.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 4395.0 km² ( 1697.6 mi² ) [% in USA = 70.68, % in Region = 63.23]
  The area from the USGS is 1740 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 321)

  IV. Elevation Analysis

  This analysis is based on 1753842 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 467.7 m ( 1534.4 ft ) [% in USA = 54.76, % in Region = 22.26]
  The elevation standard deviation is 41.7 m ( 136.8 ft ) [% in USA = 33.06, % in Region = 20.32]
  The coefficient of variation is 8.9 %.
  The vertical relief is 234.0 m ( 767.7 ft ) [% in USA = 34.06, % in Region = 22.58]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	360.0	417.5	428.9	442.0	451.4	462.3	473.3	489.2	508.9	527.3	594.0
  feet	1181.1	1369.7	1407.1	1450.1	1481.0	1516.7	1552.8	1605.0	1669.6	1730.0	1948.8

  

  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	31.4	19.5	0.007	0.011	9.90	7.74
  Intermittent Shoreline	5.9	3.7	0.001	0.002	58.36	31.29
  Perennial Streams	828.8	515.1	0.189	0.303	37.94	64.19
  Intermittent Streams	3347.4	2080.4	0.762	1.225	91.19	75.16
  Canals	33.5	20.8	0.008	0.012	63.24	63.23
  1° roads	58.4	36.3	0.013	0.021	59.92	75.16
  2° roads	123.0	76.5	0.028	0.045	53.67	66.45
  3° roads	241.6	150.1	0.055	0.088	50.83	74.52
  4° roads	5548.8	3448.6	1.263	2.031	60.49	89.68
  Total Roads	5971.8	3711.5	1.359	2.186	57.03	85.48
  Railroads	228.6	142.1	0.052	0.084	60.68	79.03
  Pipes and Powerlines	100.8	62.6	0.023	0.037	41.78	59.03

  
  Of the natural water in this HUC, 79.58% (by length) is intermittent [% in USA = 77.88, % in Region = 56.45]

  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