Much of this watershed property had once been part of the Mexican land grant Rancho Yajome, which had been granted to General Mariano G. Vallejo. Most of this watershed was wilderness area to at least 1869, and thereafter the lower watershed was begun to be developed as pasture and grazing agricultural uses. In a 1989 stream survey by Earth Metrics, the steelhead fishery was found to be robust up to and including the Silverado Country Club.
A considerable amount of this significant land had previously been part of the Mexican grant Rancho Yajome, which was awarded to General Mariano G. Vallejo. For a long time, most of this area remained unexplored wilderness until it began to be utilized for agricultural and grazing purposes in subsequent years. A 1989 survey by Earth Metrics discovered that the steelhead fishery thrived throughout the entire watershed, including the Silverado Country Club.