American Falls -- Cataloging Unit 17040206

• 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 7578.9 km² ( 2927.5 mi² ) [% in USA = 94.13, % in Region = 97.26]
  The area from the USGS is 2850 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 674)

  IV. Elevation Analysis

  This analysis is based on 3029124 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 1511.4 m ( 4958.6 ft ) [% in USA = 83.56, % in Region = 73.06]
  The elevation standard deviation is 161.2 m ( 528.9 ft ) [% in USA = 66.13, % in Region = 11.87]
  The coefficient of variation is 10.7 %.
  The vertical relief is 1379.8 m ( 4526.8 ft ) [% in USA = 74.51, % in Region = 28.31]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	1310.1	1347.8	1378.0	1405.0	1450.2	1489.5	1524.0	1554.6	1587.0	1694.1	2689.9
  feet	4298.2	4421.9	4520.9	4609.5	4757.8	4886.8	4999.9	5100.3	5206.6	5558.0	8825.0

  

  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	467.2	290.4	0.062	0.099	40.50	52.05
  Intermittent Shoreline	11.7	7.3	0.002	0.002	59.92	74.89
  Perennial Streams	673.2	418.4	0.089	0.143	23.64	8.68
  Intermittent Streams	2885.7	1793.5	0.381	0.613	55.66	65.75
  Canals	960.5	597.0	0.127	0.204	94.27	94.98
  1° roads	96.5	60.0	0.013	0.020	58.88	79.91
  2° roads	154.3	95.9	0.020	0.033	42.82	63.93
  3° roads	82.8	51.5	0.011	0.018	11.94	32.42
  4° roads	5674.2	3526.5	0.749	1.205	19.28	31.05
  Total Roads	6007.8	3733.8	0.793	1.275	18.76	32.42
  Railroads	283.5	176.2	0.037	0.060	46.52	68.04
  Pipes and Powerlines	410.0	254.8	0.054	0.087	74.28	81.74

  
  Of the natural water in this HUC, 71.76% (by length) is intermittent [% in USA = 71.67, % in Region = 84.47]

  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