USGS Water-Year Summary 2022
09486800 ALTAR WASH NEAR THREE POINTS, AZ
LOCATION - Lat 31°50'20", long 111°24'13" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 NE 1/4 sec.27, T.18 S., R.9 E., Pima County, AZ, Hydrologic Unit 15050304, on right bank attached to downstream side of bridge on State Highway 286, 0.3 mi below mouth of Chiltipines Wash and 18 mi south of Three Points.
DRAINAGE AREA - 463 mi².
PERIOD OF RECORD - Jan. 1966 to Sept. 1975, May 1992 to current year.
GAGE - Water-stage recorder and crest-stage gages. Datum of gage is 2,975.15 ft above sea level.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 22,000 ft³/s Sept. 4, 1970, gage height 13.85 ft at site 2 mi upstream. Minimum discharge, no flow for many days each year.