Lower Columbia-Clatskanie -- Cataloging Unit 17080003

• Lower Columbia Subregion 1708
  
• Pacific Northwest Region 17 (There are 219 cataloging units in this region.)
  The state composition by area is 64.8% Washington, 35.2% Oregon.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 2383.6 km² ( 920.7 mi² ) [% in USA = 30.18, % in Region = 36.53]
  The area from the USGS is 896 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 1023)

  IV. Elevation Analysis

  This analysis is based on 952403 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 281.5 m ( 923.5 ft ) [% in USA = 36.67, % in Region = 10.96]
  The elevation standard deviation is 259.1 m ( 850.1 ft ) [% in USA = 78.45, % in Region = 36.07]
  The coefficient of variation is 92.0 %.
  The vertical relief is 2526.8 m ( 8289.9 ft ) [% in USA = 95.78, % in Region = 91.32]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	0.0	49.2	61.0	122.0	180.8	233.8	283.7	343.0	427.4	594.8	2526.8
  feet	0.0	161.4	200.1	400.3	593.2	767.1	930.8	1125.3	1402.2	1951.4	8289.9

  

  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	566.8	352.3	0.238	0.383	84.89	94.06
  Intermittent Shoreline	0.0	0.0	0.000	0.000	26.95	43.84
  Perennial Streams	1610.8	1001.1	0.676	1.087	95.83	89.04
  Intermittent Streams	189.0	117.5	0.079	0.128	16.72	24.66
  Canals	29.1	18.1	0.012	0.020	68.31	63.93
  1° roads	38.6	24.0	0.016	0.026	64.57	82.65
  2° roads	71.9	44.7	0.030	0.049	56.89	78.08
  3° roads	109.5	68.1	0.046	0.074	43.77	76.26
  4° roads	4087.8	2540.6	1.715	2.759	87.21	89.04
  Total Roads	4307.9	2677.4	1.807	2.908	84.51	88.58
  Railroads	146.1	90.8	0.061	0.099	68.12	83.11
  Pipes and Powerlines	133.4	82.9	0.056	0.090	75.84	84.93

  
  Of the natural water in this HUC, 7.99% (by length) is intermittent [% in USA = 13.45, % in Region = 19.18]

  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