Lake Henshaw and the Warner Ranch, a Brief History
By Kathryn Fletcher / SOHO Newsletter / September-October 2025
SOHO Editor’s note: This article includes excerpts from the book Warner Springs Ranch and Its Environs by Joseph J. Hill, and from the Temecula Valley Historical Society Newsletter, Vol. 11, Issue 6, June 2011.
As long ago as 1869, Judge Benjamin Hayes wrote that no ranch in Southern California was better watered than the Valle de San José, also known as Warner’s Ranch. Well before that, early Spanish and American travelers wrote in their diaries of the rich verdure of this huge bowl in a semi-arid plain. By its very topography the region was destined to become a reservoir of water to irrigate thousands of acres lying between it and the Pacific.
In 1911, William G. Henshaw purchased the Warner Ranch land grant from the heirs of former Governor John Downey. Henshaw and his partner Col. Ed Fletcher set plans in motion to construct a dam at the headwaters of the San Luis Rey River.

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