South Fork Boise -- Cataloging Unit 17050113

• Middle Snake-Boise Accounting Unit 170501
  
• Middle Snake Subregion 1705
  
• 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 3377.0 km² ( 1304.4 mi² ) [% in USA = 53.29, % in Region = 61.64]
  The area from the USGS is 1300 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 1111)

  IV. Elevation Analysis

  This analysis is based on 1349245 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 1887.2 m ( 6191.5 ft ) [% in USA = 91.76, % in Region = 89.50]
  The elevation standard deviation is 414.0 m ( 1358.3 ft ) [% in USA = 92.28, % in Region = 82.65]
  The coefficient of variation is 21.9 %.
  The vertical relief is 2104.9 m ( 6905.8 ft ) [% in USA = 89.77, % in Region = 72.60]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	990.0	1376.1	1501.8	1629.8	1738.3	1843.9	1965.2	2100.2	2263.8	2486.9	3094.9
  feet	3248.0	4514.7	4927.1	5347.0	5703.0	6049.5	6447.4	6890.3	7427.1	8159.0	10153.7

  

  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	128.4	79.8	0.038	0.061	30.18	41.10
  Intermittent Shoreline	0.0	0.0	0.000	0.000	26.95	43.84
  Perennial Streams	2109.2	1310.9	0.625	1.005	93.27	80.82
  Intermittent Streams	948.9	589.8	0.281	0.452	42.16	52.05
  Canals	25.8	16.0	0.008	0.012	63.29	52.97
  1° roads	0.0	0.0	0.000	0.000	30.84	59.82
  2° roads	15.8	9.8	0.005	0.008	20.51	39.27
  3° roads	0.0	0.0	0.000	0.000	4.07	15.53
  4° roads	1698.3	1055.5	0.503	0.809	7.34	15.07
  Total Roads	1714.1	1065.3	0.508	0.817	6.44	14.16
  Railroads	0.0	0.0	0.000	0.000	12.60	28.31
  Pipes and Powerlines	5.9	3.6	0.002	0.003	12.36	17.81

  
  Of the natural water in this HUC, 29.78% (by length) is intermittent [% in USA = 33.59, % in Region = 46.12]

  VI. Other sites

  • EPA- Surf Your Watershed - Index of Watershed Indicators
  • USGS- Science in Your Watershed - Selected Realtime Streamflow Stations
  • CTIC- Known Your Watershed

  ---

  1999 SEPT 4, Last updated on 2003 JAN 23
  
  D.L. Gustafson, dlg@rapid.msu.montana.edu