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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
09470500 SAN PEDRO RIVER AT PALOMINAS, AZ
LOCATION - Lat 31°22'48", long 110°06'38" referenced to North American Datum of 1927, in SW 1/4 SE 1/4 sec.33, T.23 S., R.22 E., Cochise County, AZ, Hydrologic Unit 15050202,
The primary gage is a radar sensor, located on the upstream side of the bridge location 0.7 mi east of Palominas, 2.5 mi upstream from Green Brush Draw, 4.5 mi downstream from international boundary, and 12 mi southwest of Bisbee.
DRAINAGE AREA - 737 mi². of which 696 mi² is in Mexico.
SURFACE-WATER RECORDS
PERIOD OF RECORD - May 1930 to Oct. 1933, May 1935 to July 1941, July 1950 to Sept. 30, 1981 (discontinued as a continuous-record station; converted to a crest-stage partial-record station). Oct. 1995 to current year.
GAGE - Water-stage recorder. Datum of gage is 4,187.62 ft above sea level (State Highway Department benchmark). See WSP 1733 for history of changes prior to Nov. 24, 1955.
REMARKS - Records good except for discharge above 200 ft³/s which are fair. Estimated discharge are poor. Small diversions for irrigation of a few hundred acres above station, mostly in Mexico. Records show approximate flow of river at international boundary.
EXTREMES OUTSIDE PERIOD OF RECORD - Greatest flood since at least 1906 occurred Sept. 28, 1926, gage height, about 23.9 ft, present datum, from floodmarks; discharge not determined.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 22,000 ft³/s Aug. 14, 1940, gage height, 16.16 ft, present datum, from rating curve extended above 5,600 ft³/s on basis of slope-area measurement of peak flow; no flow at times most years.
