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Water-Year Summary for Site 09482000

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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.
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Available Parameters
00060 Discharge(Mean)  

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

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USGS Water-Year Summary 2023
LOCATION - Lat 31°52'17", long 110°58'46" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 sec.11, T.18 S., R.13 E., Pima County, AZ, Hydrologic Unit 15050301, in Spanish land grant of San Ignacio de la Canoa, on right bank 0.8 mi northeast of Green Valley Post Office, and 1.5 mi north of Continental. Prior to Feb. 13, 1981, at site 1.5 mi upstream.(unsurveyed).
DRAINAGE AREA - 1,682 mi². of which 397 mi² is in Mexico.
REVISIONS HISTORY - WSP 1283: Drainage area. WDR AZ-81-1: Drainage area.
PERIOD OF RECORD - July 1940 to Dec. 1946, Oct. 1951 to Sept. 1985, Oct. 1991 to current year (monthly discharge only for 1985-86), (crest-stage partial record station for 1987-1990). Low-flow records not equivalent prior to Feb. 13, 1981, owing to undetermined amount of underflow between sites.
GAGE - Water-stage recorder. Datum of gage is 2,806.61 ft above sea level. Prior to Feb. 13, 1981, at site 1.5 mi upstream. July 21, 1940 to Sept. 8, 1965 at datum 17.28 ft higher; Sept. 8, 1965 to present at datum 13.21 ft higher. Old site used as supplementary gage until Oct. 29, 1985.
REMARKS - Records are good except for estimated daily discharges, which are poor. Irrigation above station of about 12,500 acres including about 2,300 acres in Mexico, mostly by pumping ground water.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 45,000 ft³/s, Oct. 2, 1983, gage height, 16.34 ft, from rating curve extended above 530 ft³/s, on basis of slope-area measurement at gage height 7.75 ft and slope-area measurement of peak flow; maximum gage height 16.70 ft, Oct. 9, 1977, site and datum then in use; minimum, no flow for most of each year.