Warning: Javascript must be enabled to use all the features on this page!


Page Loading - Please Wait...

Click to hideNews Bulletins

Water-Year Summary for Site 12462600

Click to hide Water-Year Summary instructions and information
  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00060 Discharge(Mean)  

Water year 2023: 2022-10-01 to 2023-09-30
 

Print this page
USGS Water-Year Summary 2023
12462600 COLUMBIA RIVER BELOW ROCK ISLAND DAM, WA
LOCATION - Lat 47°19'57", long 120°04'48" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 sec.09, T.21 N., R.22 E., Douglas County, WA, Hydrologic Unit 17020010, on left bank 1.0 mi downstream from Rock Island Dam, 2.0 mi downstream from Rock Island Creek, 12 mi southeast of Wenatchee, and at mile 452.4. Auxiliary GAGE: Lat 47 18'15", long 120 05'00", in NE 1/4 NW 1/4 sec. 21, T. 21 N., R. 22 E., Douglas County, Hydrologic Unit 17020010, on left bank 2.0 mi downstream from the base gage, and at mile 450.4.
DRAINAGE AREA - 89,400 mi².
REVISIONS HISTORY - Daily mean discharges for the period June 1, 1961 to Mar. 22, 2023 were revised on June 21, 2023, based on changes to reported dates of values previously reported as 1 day in advance.
SURFACE-WATER RECORDS
PERIOD OF RECORD - January to December 1910 (gage heights only), May 1913 to December 1916, October 1930 to current year. Published as "at Wenatchee" January 1910 to December 1916, and as "at Trinidad" October 1930 to May 1961.
GAGE - Daily discharge determined from flow through turbines plus spillway flow when present. Datum of gage is NGVD of 1929. Prior to Jan. 1, 1916, nonrecording gage 1.2 mi upstream from highway bridge at Wenatchee, at mile 466.3, at datum 583 ft above NGVD of 1929. Jan. 1 to Dec. 31, 1916, nonrecording gage on pier of highway bridge at Wenatchee, at mile 465.1, at datum 579.30 ft above NGVD of 1929. Oct. 1, 1930, to May 31, 1961, water-stage recorder 0.5 mi southwest of Trinidad, at mile 441.7, at datum 499.3 ft above NGVD of 1929 (river-profile survey). June 1, 1961, to July 22, 1988, water-stage recorder at present site and datum; May 21, 1963, to July 22, 1988, auxiliary water-stage recorder 2.0 mi downstream at same datum.
COOPERATION - Discharge records provided by Public Utility District No. 1 of Chelan County at Rock Island Dam through the Corps of Engineers, North Pacific Division, Reservoir Control Center. The U.S. Geological Survey makes discharge measurements at this site during the year.
REMARKS - Flow regulated by numerous reservoirs. Feeder Canal diversion (station 12435500) for Columbia Basin project is used to irrigate approximately 600,000 acres in the United States. An additional 66,500 acres in Canada are irrigated by other diversions.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 7, 1894, reached a discharge of about 740,000 ft³/s, from flood-marks at Wenatchee.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 692,600 ft³/s, June 12, 1948, gage height, 59.35 ft, site and datum then in use; minimum discharge, 4,120 ft³/s, Feb. 10, 1932, gage height, 11.40 ft, site and datum then in use.