Surface Water

Santa Ana River near Mentone (11051500), BFS

This site will serve as a reference indicator where the Santa Ana River exits from the San Bernadino Mountains. The drainage area is 210 mi² at an elevation of 1950 feet above sea level. The USGS has operated a gage at this site since July 1896. Presently, in the reach that includes the gage, the channel is confined to a width of about 200 ft. A smaller channel that is approximately 50 ft wide and constructed within the main river channel confines most sustained flow. This smaller diked channel constricts low to high flows to the far right side and has been maintained primarily to force flow into a diversion pool at the gage shelter location. This site is downstream of the newly-completed Seven Oaks Dam. This site is also a trend site sample 8 times per year.

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Santa Ana River below outlet from 7 Oaks Dam.	Santa Ana River at the USGS gage below 7 Oaks Dam.
(Photographs by Carmen Burton, USGS)