Plains of Leon
The Plains of Leon are named for the former gold mining town, Leon once located near the middle of the plain. It is a plain in the Perris Block, contiguous on the south with the Perris Plain including within it the Domenigoni Valley and western Diamond Valley, French Valley, Auld Valley, the upper part of the valley of Warm Springs Creek and connecting tablelands.
The Plains of Leon are bounded on the west by the Paloma Valley, the southeastern Temescal Mountains and the valley of Warm Springs Creek after it drops below the level of the tablelands of the plains. On the north by Menifee Valley and the Domenigoni Mountains, on the south it extends to include French Valley, Auld Valley and the tablelands between them. It is bounded on the south by Tucalota Creek (originally Alamos Creek), and the level land west of it to Warm Springs Creek and northeast of Murrieta Hot Springs. To the east it was originally bounded by the eastern Diamond Valley, Rawson Mountains, Bachelor Mountain, Black Mountain, and Tucalota Hills. However, now Diamond Valley is bounded on the east by the West Dam of the Diamond Valley Lake. Auld Valley is now bounded to the east by Skinner Reservoir south of Bachelor Mountain on Tucalota Creek.
Unlike the Perris Plain, which lies within the watershed of the San Jacinto River, the Plains of Leon are drained by Warm Springs Creek, French Valley Creek and Tucalota Creek, tributaries of Murrieta Creek and its parent the Santa Margarita River.
- Elmer Wallace Holmes, History of Riverside County, California: With Biographical Sketches of the Leading Men and Women of the County who Have Been Identified with Its Growth and Development from the Early Days to the Present, Historic Record Company, Riverside County, 1912, p.140
- USGS 1:24K topographic map, Romoland, CA.
- USGS 1:24K topographic map, Winchester, CA.
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