North and Middle Forks Boise -- Cataloging Unit 17050111

• 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 1977.0 km² ( 763.6 mi² ) [% in USA = 19.19, % in Region = 24.20]
  The area from the USGS is 761 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 606)

  IV. Elevation Analysis

  This analysis is based on 789205 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 1974.5 m ( 6477.9 ft ) [% in USA = 93.13, % in Region = 92.24]
  The elevation standard deviation is 366.1 m ( 1201.1 ft ) [% in USA = 88.77, % in Region = 70.32]
  The coefficient of variation is 18.5 %.
  The vertical relief is 2020.8 m ( 6629.8 ft ) [% in USA = 88.06, % in Region = 68.95]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	1097.0	1530.3	1652.0	1751.9	1827.3	1917.7	2047.9	2173.8	2320.1	2495.4	3117.8
  feet	3599.0	5020.6	5419.9	5747.6	5995.0	6291.6	6718.8	7131.8	7611.8	8186.9	10228.9

  

  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	32.5	20.2	0.016	0.026	17.20	21.00
  Intermittent Shoreline	0.0	0.0	0.000	0.000	26.95	43.84
  Perennial Streams	1490.3	926.2	0.754	1.213	98.06	97.72
  Intermittent Streams	142.5	88.6	0.072	0.116	15.82	21.46
  Canals	0.0	0.0	0.000	0.000	35.62	23.74
  1° roads	0.0	0.0	0.000	0.000	30.84	59.82
  2° roads	0.0	0.0	0.000	0.000	15.35	29.22
  3° roads	15.6	9.7	0.008	0.013	8.91	25.57
  4° roads	1193.4	741.7	0.604	0.971	11.56	20.09
  Total Roads	1209.1	751.4	0.612	0.984	10.09	18.72
  Railroads	0.0	0.0	0.000	0.000	12.60	28.31
  Pipes and Powerlines	0.0	0.0	0.000	0.000	8.67	12.79

  
  Of the natural water in this HUC, 8.56% (by length) is intermittent [% in USA = 13.88, % in Region = 20.55]

  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