Largest Lakes of Iowa

Iowa’s largest lakes range from natural glacial jewels to sprawling flood-control reservoirs. In the northwest lie the Iowa Great Lakes — West Okoboji, East Okoboji and Big Spirit — deep, spring-fed waters famous for boating and clear-water fishing, while man-made giants like Rathbun, Red Rock, Saylorville and Coralville spread across the state’s rivers. Together they form Iowa’s premier open water for walleye, muskie, crappie, bluegill and channel catfish, with public boat ramps, sandy beaches, marinas and lakeside state-park campgrounds. Many stay busy year-round, from summer sailing to winter ice fishing. Below are detailed guides to each of Iowa’s biggest lakes and reservoirs — surface size, depth, fish species, boat access, camping and the best times to fish.