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Water-Year Summary for Site 09482500

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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Available Parameters
00060 Discharge(Mean) [Data from 10/1/1992 Forward]  

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

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USGS Water-Year Summary 2023
LOCATION - Lat 32°13'16", long 110°58'52" referenced to North American Datum of 1927, in SE 1/4 SE 1/4 sec.11, T.14 S., R.13 E., Pima County, AZ, Hydrologic Unit 15050301, on right bank, 300 ft downstream from Congress Street Bridge, in Tucson.
DRAINAGE AREA - 2,222 mi². of which 397 mi² is in Mexico. Drainage area further adjusted for 15.2 mi² of Tucson Arroyo drainage that has been contributing to this station effective July 1956.
REVISIONS HISTORY - WSP 859: 1915(M). WSP 1283: Drainage area. WSP 1313: 1939(M). WDR AZ-88-1: 1986-87(M).
PERIOD OF RECORD - Oct. 1905 to Sept. 1981 (monthly discharge only, Jan. 1907 to Sept. 1912, Jan. to Sept. 1914), June 1986 to Sept. 1995 (discharge above 500 ft³/s only), Oct. 1995 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 2,320.68 ft above sea level. Prior to Nov. 27, 1929, nonrecording gages or reference points for measuring to water surface at various places on Congress Street bridge at various datums. Nov. 27, 1929 to Sept. 30, 1981, water-stage recorder at Congress Street bridge: at datum 6.22 ft higher Nov. 27, 1929 to June 18, 1958; at datum 2.22 ft higher June 18, 1958 to May 21, 1963; at datum 3.48 ft lower May 21, 1963 to Oct. 27, 1970; at datum 2.86 ft lower Oct. 1, 1971, to Sept. 30, 1981. No gage Oct. 27, 1970 to Oct. 1, 1971, and Oct. 10, 1977, to Feb. 14, 1978.
REMARKS - Records good except for estimated periods which are poor.  Some records listed in the Period of Record may not be available electronically.  Irrigation above station of about 26,000 acres, including about 2,300 acres in Mexico, mostly by pumping from ground water. Groundwater is also pumped above the station for municipal supply and mining. From Oct. l969 to Sept. 1981, all flow past station was published, including waste water when known.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge since since 1892 is 52,700 ft³/s, from slope-area measurement of peak flow, Oct. 2, 1983; gage height, 22.2 ft, from floodmark, at site and datum used in 1981. Maximum discharge during the 1985 water year was 10,000 ft³/s Dec. 28, 1984; gage height, 12.5 ft, at site and datum used in 1981.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 37,400 ft³/s Jan. 19, 1993, gage height, 11.67 ft; no flow for most of each year.