2012 Map of Cortina Creek

About this map

Spring Valley serves as a central reference point in this landscape where water management and agriculture define the geography. The presence of the Tehama Colusa Canal and Glenn-Colusa Canal illustrates the extensive irrigation infrastructure required to sustain the western Sacramento Valley. These man-made arteries cross a natural network of seasonal drainages, including Cortina Cr, Chamisal Cr, and Sand Cr, which flow from the hills toward the valley floor. The road system is dominated by a grid of named rural routes such as Walnut Dr, Myers Rd, and Cortina School Rd, reflecting the parceling of land for farming. This 2012 survey by the U. S. Geological Survey documents the intersection of modern hydraulic engineering with traditional ranching and agricultural land use in Colusa County.