Lower Columbia-Sandy -- Cataloging Unit 17080001

• Lower Columbia Subregion 1708
  
• Pacific Northwest Region 17 (There are 219 cataloging units in this region.)
  The state composition by area is 54.4% Oregon, 45.6% Washington.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 3025.4 km² ( 1168.6 mi² ) [% in USA = 47.13, % in Region = 55.71]
  The area from the USGS is 1110 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 1742)

  IV. Elevation Analysis

  This analysis is based on 1208086 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 491.0 m ( 1610.9 ft ) [% in USA = 56.04, % in Region = 17.81]
  The elevation standard deviation is 433.0 m ( 1420.6 ft ) [% in USA = 93.70, % in Region = 86.76]
  The coefficient of variation is 88.2 %.
  The vertical relief is 3344.5 m ( 10972.6 ft ) [% in USA = 99.15, % in Region = 97.26]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	8.5	61.0	63.0	106.2	240.9	369.5	548.0	729.7	915.9	1102.9	3353.0
  feet	27.9	200.1	206.7	348.4	790.3	1212.3	1797.9	2394.0	3004.9	3618.4	11000.5

  

  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	886.4	550.9	0.293	0.471	90.15	96.80
  Intermittent Shoreline	1.0	0.6	0.000	0.001	39.65	53.42
  Perennial Streams	1751.9	1088.8	0.579	0.932	89.72	73.52
  Intermittent Streams	248.2	154.3	0.082	0.132	17.01	25.11
  Canals	12.6	7.8	0.004	0.007	56.56	45.21
  1° roads	180.4	112.2	0.060	0.096	92.85	97.72
  2° roads	80.1	49.8	0.026	0.043	51.92	72.15
  3° roads	175.1	108.8	0.058	0.093	53.10	89.50
  4° roads	5854.1	3638.4	1.935	3.113	91.80	92.69
  Total Roads	6289.7	3909.1	2.079	3.345	90.62	93.61
  Railroads	242.6	150.8	0.080	0.129	79.11	88.58
  Pipes and Powerlines	242.1	150.5	0.080	0.129	88.77	96.35

  
  Of the natural water in this HUC, 8.63% (by length) is intermittent [% in USA = 13.97, % in Region = 21.46]

  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