Upper Snake-Rock -- Cataloging Unit 17040212

• Upper Snake Accounting Unit 170402
  
• Upper Snake Subregion 1704
  
• Pacific Northwest Region 17 (There are 219 cataloging units in this region.)
  The state composition by area is 100.0% Idaho.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 6386.5 km² ( 2466.9 mi² ) [% in USA = 89.20, % in Region = 95.43]
  The area from the USGS is 2440 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 994)

  IV. Elevation Analysis

  This analysis is based on 2552187 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 1270.5 m ( 4168.3 ft ) [% in USA = 78.26, % in Region = 57.53]
  The elevation standard deviation is 259.6 m ( 851.7 ft ) [% in USA = 78.49, % in Region = 36.53]
  The coefficient of variation is 20.4 %.
  The vertical relief is 1580.1 m ( 5184.0 ft ) [% in USA = 78.02, % in Region = 38.36]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	769.6	992.5	1056.8	1127.0	1189.4	1233.0	1277.0	1320.0	1403.2	1657.6	2349.7
  feet	2524.9	3256.2	3467.1	3697.5	3902.2	4045.2	4189.6	4330.7	4603.6	5438.3	7708.9

  

  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	326.4	202.9	0.051	0.082	36.52	47.49
  Intermittent Shoreline	40.6	25.2	0.006	0.010	79.91	90.87
  Perennial Streams	850.9	528.8	0.133	0.214	29.89	12.79
  Intermittent Streams	2635.1	1637.7	0.413	0.664	59.40	71.69
  Canals	1858.0	1154.8	0.291	0.468	98.15	99.09
  1° roads	124.0	77.1	0.019	0.031	69.11	84.47
  2° roads	202.5	125.9	0.032	0.051	59.88	81.28
  3° roads	127.6	79.3	0.020	0.032	21.46	45.66
  4° roads	7830.4	4866.7	1.226	1.973	56.32	68.95
  Total Roads	8284.6	5148.9	1.297	2.087	50.92	70.32
  Railroads	234.6	145.8	0.037	0.059	45.57	67.58
  Pipes and Powerlines	364.3	226.4	0.057	0.092	76.60	85.39

  
  Of the natural water in this HUC, 69.44% (by length) is intermittent [% in USA = 69.40, % in Region = 81.74]

  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