Skykomish -- Cataloging Unit 17110009

• Puget Sound Subregion 1711
  
• Pacific Northwest Region 17 (There are 219 cataloging units in this region.)
  The state composition by area is 100.0% Washington.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 2168.2 km² ( 837.5 mi² ) [% in USA = 24.68, % in Region = 31.05]
  The area from the USGS is 853 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 777)

  IV. Elevation Analysis

  This analysis is based on 866299 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 844.1 m ( 2769.3 ft ) [% in USA = 68.31, % in Region = 35.62]
  The elevation standard deviation is 488.0 m ( 1601.0 ft ) [% in USA = 96.49, % in Region = 94.52]
  The coefficient of variation is 57.8 %.
  The vertical relief is 2361.0 m ( 7746.0 ft ) [% in USA = 94.22, % in Region = 87.21]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	27.3	157.9	292.8	509.0	701.7	884.2	1038.1	1178.0	1312.2	1463.4	2388.3
  feet	89.6	518.0	960.6	1669.9	2302.1	2900.9	3405.8	3864.8	4305.1	4801.1	7835.5

  

  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	308.2	191.6	0.142	0.229	69.45	83.11
  Intermittent Shoreline	0.0	0.0	0.000	0.000	26.95	43.84
  Perennial Streams	1412.8	878.1	0.652	1.048	94.79	84.93
  Intermittent Streams	54.3	33.7	0.025	0.040	9.90	9.13
  Canals	22.9	14.2	0.011	0.017	66.84	60.27
  1° roads	0.0	0.0	0.000	0.000	30.84	59.82
  2° roads	79.8	49.6	0.037	0.059	66.89	86.30
  3° roads	6.7	4.1	0.003	0.005	5.83	18.72
  4° roads	1612.5	1002.2	0.744	1.197	18.95	30.14
  Total Roads	1699.0	1055.9	0.784	1.261	18.47	31.96
  Railroads	104.1	64.7	0.048	0.077	57.18	76.71
  Pipes and Powerlines	120.2	74.7	0.055	0.089	75.37	83.56

  
  Of the natural water in this HUC, 3.06% (by length) is intermittent [% in USA = 8.67, % in Region = 9.13]

  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