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 significant portion of this pivotal land had previously been part of the Mexican grant Rancho Yajome, which was awarded to General Mariano G. Vallejo. For a considerable period, up until 1869, most of this watershed remained an untouched wilderness area, and later it began to be utilized for grazing and agricultural purposes. A 1989 survey by Earth Metrics discovered that the steelhead fishery thrived throughout the entire watershed, including the Silverado Country Club.