Lower Henrys -- Cataloging Unit 17040203

• 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 66.2% Idaho, 33.8% Wyoming.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 2668.0 km² ( 1030.6 mi² ) [% in USA = 38.51, % in Region = 47.03]
  The area from the USGS is 1040 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 391)

  IV. Elevation Analysis

  This analysis is based on 1065648 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 1905.6 m ( 6251.9 ft ) [% in USA = 92.23, % in Region = 90.41]
  The elevation standard deviation is 358.0 m ( 1174.5 ft ) [% in USA = 88.25, % in Region = 67.12]
  The coefficient of variation is 18.8 %.
  The vertical relief is 1337.9 m ( 4389.4 ft ) [% in USA = 73.47, % in Region = 24.20]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	1466.0	1507.3	1583.2	1646.0	1707.0	1791.1	1937.5	2012.1	2283.1	2525.0	2803.9
  feet	4809.7	4945.2	5194.2	5400.2	5600.3	5876.2	6356.6	6601.3	7490.4	8284.0	9199.0

  

  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	313.3	194.7	0.117	0.189	62.06	75.80
  Intermittent Shoreline	14.3	8.9	0.005	0.009	77.78	89.04
  Perennial Streams	574.2	356.9	0.215	0.346	42.44	23.74
  Intermittent Streams	728.2	452.6	0.273	0.439	41.17	51.14
  Canals	425.7	264.6	0.160	0.257	95.88	97.72
  1° roads	0.0	0.0	0.000	0.000	30.84	59.82
  2° roads	33.7	21.0	0.013	0.020	31.12	52.97
  3° roads	33.2	20.6	0.012	0.020	13.36	35.16
  4° roads	1990.7	1237.3	0.746	1.201	19.09	30.59
  Total Roads	2057.7	1278.9	0.771	1.241	17.81	30.14
  Railroads	85.1	52.9	0.032	0.051	41.50	64.38
  Pipes and Powerlines	14.7	9.1	0.006	0.009	18.00	25.57

  
  Of the natural water in this HUC, 45.55% (by length) is intermittent [% in USA = 47.75, % in Region = 61.19]

  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