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Wilbur Hot Springs, formerly known as Simmons Hot Springs, is a naturally occurring historic hot spring approximately 22 miles west of Williams, Colusa County, in northern California, United States. It is about two hours by car northeast of the San Francisco Bay Area, near the junction of State Routes 16 and 20. It was developed as a spa in the 19th century, and since its acquisition in the 1970s by therapist Richard Louis Miller, has been operated as a spa resort and personal retreat. The adjacent valley was added to the property as a nature reserve protected by covenant.