Rock -- Cataloging Unit 17060109

• 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 97.6% Washington, 2.4% Idaho.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 2485.2 km² ( 960.0 mi² ) [% in USA = 33.40, % in Region = 42.01]
  The area from the USGS is 962 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 246)

  IV. Elevation Analysis

  This analysis is based on 992617 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 684.4 m ( 2245.4 ft ) [% in USA = 63.43, % in Region = 26.03]
  The elevation standard deviation is 102.2 m ( 335.3 ft ) [% in USA = 55.99, % in Region = 3.65]
  The coefficient of variation is 14.9 %.
  The vertical relief is 853.9 m ( 2801.5 ft ) [% in USA = 63.00, % in Region = 5.94]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	426.0	544.8	579.0	619.9	670.0	701.0	731.0	748.2	767.9	792.0	1279.9
  feet	1397.6	1787.4	1899.6	2033.8	2198.1	2299.8	2398.3	2454.7	2519.3	2598.4	4199.1

  

  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	169.2	105.1	0.068	0.110	43.63	55.71
  Intermittent Shoreline	2.6	1.6	0.001	0.002	55.00	69.86
  Perennial Streams	341.6	212.3	0.137	0.221	30.51	13.24
  Intermittent Streams	1116.8	694.1	0.449	0.723	63.43	75.34
  Canals	0.0	0.0	0.000	0.000	35.62	23.74
  1° roads	1.9	1.2	0.001	0.001	40.36	67.58
  2° roads	44.0	27.4	0.018	0.028	39.27	60.27
  3° roads	107.0	66.5	0.043	0.069	41.73	72.60
  4° roads	2069.1	1286.0	0.833	1.340	24.16	39.27
  Total Roads	2222.1	1381.0	0.894	1.439	24.21	42.01
  Railroads	231.7	144.0	0.093	0.150	85.03	91.78
  Pipes and Powerlines	148.5	92.3	0.060	0.096	78.92	88.13

  
  Of the natural water in this HUC, 68.67% (by length) is intermittent [% in USA = 68.69, % in Region = 80.37]

  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