Harvey Gap State Park, established in 1987 in Garfield County, Colorado, is a small state park centered on Grass Valley Reservoir. When full, the reservoir covers 190 acres and supports the park’s primary uses: fishing and limited-use boating. Year-round fishing gives the park its main appeal and defines its character. Rather than standing out for major development, Harvey Gap is significant as a modest, water-focused recreation area valued for consistent public use.