El Dorado Lake is a 8,000-acre U.S. Army Corps of Engineers reservoir on the Walnut River in Butler County in south-central Kansas — the primary recreational boating destination for the Wichita eastern corridor and one of the most heavily used lakes in the Kansas state park system. The lake sits approximately 25 miles northeast of downtown Wichita in El Dorado, making it the most accessible large reservoir to the eastern Wichita suburbs and drawing consistent boating traffic from the Andover, Derby, and El Dorado communities throughout the open water season. El Dorado State Park surrounding the lake is the largest state park in Kansas by acreage and provides four separate campground areas, multiple boat ramps, and marina facilities serving a large year-round boating population. Largemouth bass, walleye, crappie, white bass, and channel catfish provide the primary fishery managed by the Kansas Department of Wildlife and Parks. Find Boat Services lists verified boat repair, motor service, electronics installation, trailer repair, and storage providers serving El Dorado Lake within 35 miles across Butler and Sedgwick counties.