Ponca -- Cataloging Unit 10150001

• Niobrara Subregion 1015
  
• Missouri Region 10 (There are 310 cataloging units in this region.)
  The state composition by area is 52.6% South Dakota, 47.4% Nebraska.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 2079.4 km² ( 803.2 mi² ) [% in USA = 22.03, % in Region = 15.16]
  The area from the USGS is 776 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 254)

  IV. Elevation Analysis

  This analysis is based on 831655 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 586.2 m ( 1923.2 ft ) [% in USA = 60.45, % in Region = 31.94]
  The elevation standard deviation is 85.1 m ( 279.2 ft ) [% in USA = 52.11, % in Region = 52.90]
  The coefficient of variation is 14.5 %.
  The vertical relief is 375.0 m ( 1230.3 ft ) [% in USA = 46.42, % in Region = 42.90]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	372.0	470.3	503.8	533.0	560.2	588.1	625.0	655.0	671.0	691.5	747.0
  feet	1220.5	1543.0	1652.9	1748.7	1837.9	1929.4	2050.5	2148.9	2201.4	2268.7	2450.8

  

  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	37.8	23.5	0.018	0.029	18.57	19.03
  Intermittent Shoreline	32.5	20.2	0.016	0.025	89.63	77.74
  Perennial Streams	399.8	248.5	0.192	0.309	38.51	65.48
  Intermittent Streams	740.1	460.0	0.356	0.573	51.63	20.65
  Canals	0.0	0.0	0.000	0.000	35.62	43.55
  1° roads	0.0	0.0	0.000	0.000	30.84	48.39
  2° roads	112.6	70.0	0.054	0.087	85.69	93.55
  3° roads	116.4	72.4	0.056	0.090	51.82	75.16
  4° roads	2278.5	1416.1	1.096	1.763	44.72	73.55
  Total Roads	2507.5	1558.4	1.206	1.940	43.30	72.26
  Railroads	95.2	59.1	0.046	0.074	54.76	74.52
  Pipes and Powerlines	82.8	51.5	0.040	0.064	61.20	79.03

  
  Of the natural water in this HUC, 63.84% (by length) is intermittent [% in USA = 64.52, % in Region = 31.29]

  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