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USGS Water-Year Summary 2025
11055000 Mill Creek near Mentone, CA
LOCATION - Lat 34°04'40", long 117°05'54" referenced to North American Datum of 1927, in SE 1/4 SW 1/4 sec.16, T.1 S., R.2 W., San Bernardino County, CA, Hydrologic Unit 18070203, at Garnet Street Bridge, 1.5 mi northeast of Mentone, and 1.55 mi upstream from mouth.
DRAINAGE AREA - 49.1 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - February 1939 to September 1965, October 1997 to current year. Monthly discharge only for February 1939, published in WSP 1315-B. Instantaneous values only, based on discharge measurements, since October 1997.
GAGE - None. Elevation of station is 2,010 ft above NGVD of 1929, from topographic map. February 1939 to September 1965, water-stage recorder and broad-crested weir at site 1.2 mi downstream.
COOPERATION - Discharge measurements are provided by the San Bernardino Valley Water Conservation District (SBVWCD) during some years; no measurements or zero flow values were provided during water year 2015.
REMARKS - Measurements used for daily values are considered fair to poor. No regulation above station. Mill Creek Power Canals Nos. 1 and 3 divert from points 3.8 mi and 9.8 mi above station, respectively, and a varying portion of the remaining flow is sometimes diverted at a point 0.7 mi upstream for ground-water recharge. Power Canal No. 2, which diverted from a point 6.8 mi upstream from station, was damaged during an earthquake in 1992, has not been used since 1992, and has been permanently discontinued. Pumping of wells along stream above station for irrigation. See schematic diagram of Santa Ana River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - (1939-65) Maximum discharge, 1,500 ft³/s, Dec. 23, 1945, gage height, 6.5 ft, site and datum then in use, on basis of slope-area measurement of maximum flow; no flow for parts of each year.
