The Los Gatos Creek sub watershed drains . Los Gatos Creek originates at on Loma Prieta Mountain in the Santa Cruz Mountains and flows west to the minor Williams Reservoir above Lake Elsman (also a reservoir formed by Austrian Dam), where it is joined from the north by Austrian Gulch. Its next named tributaries are Hooker Gulch Creek, Moody Gulch and Hendrys Creek, also joining from the north, before Los Gatos Creek enters Lexington Reservoir. In Lexington Reservoir the next tributaries (left) are Aldercroft Creek and Briggs Creek (left), and by the more major Soda Springs Creek (right), then Black Creek (left), Lyndon Creek (left) and Limekiln Creek (right). Below Lexington Dam Los Gatos Creek flows northeast and is joined immediately by Trout Creek (left) then, north of Blossom Hill Road, it flows into Vasona Reservoir in Los Gatos, which is formed by Vasona Dam. In Willow Glen Los Gatos Creek is joined by Dry Creek (left) then, after crossing Interstate 280, El Camino Real and The Alameda, it joins the Guadalupe River in the Guadalupe River Park.