 The creek continues northwest along the eastern boundary of Joseph D. Grant County Park and joins Isabel Creek about 15.3 km WNW of Mount Hamilton at , forming Arroyo Hondo and eventually joining Calaveras Creek in Calaveras Reservoir.Calaveras Creek exits the reservoir and joins Alameda Creek before final terminating in San Francisco Bay.Steelhead trout ("Oncorhynchus mykiss") are native to Smith Creek, although the construction of Calaveras Dam blocks in-migrating fish.