Middle Columbia-Lake Wallula -- Cataloging Unit 17070101

• Middle Columbia Accounting Unit 170701
  
• Middle Columbia Subregion 1707
  
• Pacific Northwest Region 17 (There are 219 cataloging units in this region.)
  The state composition by area is 70.6% Washington, 29.4% Oregon.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 6496.6 km² ( 2509.4 mi² ) [% in USA = 89.91, % in Region = 95.89]
  The area from the USGS is 2550 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 602)

  IV. Elevation Analysis

  This analysis is based on 2594669 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 371.6 m ( 1219.1 ft ) [% in USA = 47.61, % in Region = 15.53]
  The elevation standard deviation is 230.6 m ( 756.6 ft ) [% in USA = 74.99, % in Region = 28.31]
  The coefficient of variation is 62.1 %.
  The vertical relief is 1341.0 m ( 4399.6 ft ) [% in USA = 73.76, % in Region = 26.03]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	61.0	122.0	176.9	213.0	272.0	312.0	369.4	444.3	547.4	724.8	1402.0
  feet	200.1	400.3	580.4	698.8	892.4	1023.6	1211.9	1457.7	1795.9	2377.9	4599.7

  

  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	620.1	385.4	0.095	0.154	54.48	67.58
  Intermittent Shoreline	8.2	5.1	0.001	0.002	57.18	72.15
  Perennial Streams	157.8	98.1	0.024	0.039	10.85	1.83
  Intermittent Streams	3704.4	2302.3	0.570	0.917	76.84	87.21
  Canals	55.4	34.4	0.009	0.014	64.52	55.25
  1° roads	156.2	97.1	0.024	0.039	74.32	88.58
  2° roads	74.8	46.5	0.012	0.019	29.37	52.05
  3° roads	206.9	128.6	0.032	0.051	32.83	64.38
  4° roads	5554.3	3452.0	0.855	1.376	26.15	43.38
  Total Roads	5992.2	3724.2	0.922	1.484	25.91	44.75
  Railroads	492.4	306.0	0.076	0.122	76.93	88.13
  Pipes and Powerlines	331.2	205.8	0.051	0.082	71.39	79.45

  
  Of the natural water in this HUC, 82.68% (by length) is intermittent [% in USA = 81.05, % in Region = 93.61]

  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