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Water-Year Summary for Site 12502500

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  • 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)  
00065 Gage height(Mean)  

Water year 2020: 2019-10-01 to 2020-09-30
 

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USGS Water-Year Summary 2020
12502500 AHTANUM CREEK AT UNION GAP, WA
LOCATION - Lat 46°32'10", long 120°28'20" referenced to North American Datum of 1927, in SE 1/4 SW 1/4 sec.08, T.12 N., R.19 E., Yakima County, WA, Hydrologic Unit 17030003, on right downstream wingwall of Union Pacific Railway bridge at Union Gap, 1.0 mi south of town of Union Gap, and at mile 0.6.
DRAINAGE AREA - 173 mi².
REVISIONS HISTORY - WSP 1933: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - May to November 1904, August 1907 to July 1908, March to October 1910, April 1911 to September 1914, May 1951 to April 1953, August 1960 to current year. Published as "near Yakima" 1904, 1907-08, 1910-12. Records for water years 1913-14 are published in WSP 1286.
GAGE - Water-stage recorder. Datum of gage is 943.560 ft above NAVD of 1988. Prior to Sept. 30, 1914, non-recording gage at approximately same site at various datums. May 12, 1951, to Sept. 30, 1972, water-stage recorder at present site at datum 3.00 ft higher.
REMARKS - Extreme high flows may include transbasin flow from Wide Hollow Creek. Diversions and ground-water withdrawals for irrigation of about 9,000 acres upstream from station. Return from transbasin irrigation flows contribute to base flow. Chemical data (irrigation seasons only) for 1975-76 water years. Water temperature records March to December 1981. Bureau of Reclamation satellite telemeter at station.
  • Water Years 2014 to 2016: Records good except those above 400 cfs which are fair, and estimated daily discharges, which are poor.
  • Water Year 2017: Records good except those above 100 cfs which are fair, and estimated daily discharges, which are poor.
  • Water Year 2018: Records fair. No estimated daily discharges.
  • Water Year 2019, 2020: Records good.  No estimated daily discharges.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 3,100 ft³/s, Jan. 16, 1974, gage height, 10.36 ft; maximum gage height, 13.5 ft, from high-water mark, backwater from Yakima River; no flow many days during September and October 1904.