2018 Map of Cortina Creek

About this map

Williams sits at the northern edge of this landscape where the flat expanse of the Sacramento Valley meets the rising foothills of Colusa County. The terrain is defined by a sophisticated water management network, dominated by the massive Glenn-Colusa Canal and the Tehama Colusa Canal which traverse the plains to support local agriculture. Moving west, the topography shifts into the drainage basins of Cortina Creek and Walters Creek, which flow through the rolling heights of Spring Valley. This area reflects a transition between intensive valley floor farming and upland ranching, connected by a grid of named rural routes like Cortina School Rd and Cortina Vineyard Rd. Numerous seasonal drainages such as Chamisal Cr and Sand Creek carve through the southern hills, illustrating the natural watershed that feeds into the irrigation systems of the Central Valley.