Hells Canyon -- Cataloging Unit 17060101

• Lower Snake Accounting Unit 170601
  
• Lower Snake Subregion 1706
  
• Pacific Northwest Region 17 (There are 219 cataloging units in this region.)
  The state composition by area is 68.1% Idaho, 31.9% Oregon.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 1384.4 km² ( 534.8 mi² ) [% in USA = 7.82, % in Region = 9.13]
  The area from the USGS is 545 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 844)

  IV. Elevation Analysis

  This analysis is based on 553473 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 1231.3 m ( 4039.6 ft ) [% in USA = 77.40, % in Region = 54.79]
  The elevation standard deviation is 498.3 m ( 1634.8 ft ) [% in USA = 96.87, % in Region = 95.43]
  The coefficient of variation is 40.5 %.
  The vertical relief is 2498.9 m ( 8198.4 ft ) [% in USA = 95.50, % in Region = 90.41]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	304.0	591.8	788.0	933.1	1080.6	1205.8	1315.9	1444.1	1626.3	1957.0	2802.9
  feet	997.4	1941.6	2585.3	3061.3	3545.2	3956.0	4317.2	4737.8	5335.6	6420.5	9195.8

  

  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	201.8	125.4	0.146	0.235	70.77	84.93
  Intermittent Shoreline	0.0	0.0	0.000	0.000	26.95	43.84
  Perennial Streams	589.0	366.0	0.425	0.685	73.80	47.49
  Intermittent Streams	429.3	266.8	0.310	0.499	46.80	57.08
  Canals	0.0	0.0	0.000	0.000	35.62	23.74
  1° roads	0.0	0.0	0.000	0.000	30.84	59.82
  2° roads	0.0	0.0	0.000	0.000	15.35	29.22
  3° roads	0.0	0.0	0.000	0.000	4.07	15.53
  4° roads	434.6	270.1	0.314	0.505	2.32	5.94
  Total Roads	434.6	270.1	0.314	0.505	1.99	5.02
  Railroads	0.0	0.0	0.000	0.000	12.60	28.31
  Pipes and Powerlines	1.5	0.9	0.001	0.002	11.23	15.53

  
  Of the natural water in this HUC, 35.19% (by length) is intermittent [% in USA = 38.51, % in Region = 50.68]

  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