Blue Lake in Monona County, Iowa is located within Lewis and Clark State Park near Onawa. The lake covers approximately 275 acres with an average depth of 11 feet, making it suitable for recreational paddling activities including kayaking and canoeing.

The lake features boat ramps that provide access for watercraft, and kayaking is specifically listed among the available amenities. Blue Lake has no tributaries, which affects its water management and requires active maintenance by the Iowa DNR to maintain adequate water levels. Recent years have seen significant challenges with water levels, including a catastrophic drop of approximately 5 feet following hydraulic dredging operations conducted during drought conditions in 2022.

The lake supports diverse fish populations including largemouth bass, channel catfish, common carp, black crappie, bluegill, northern pike, and black bullhead, indicating a healthy aquatic ecosystem that paddlers can observe. Wildlife viewing opportunities include various bird species, fish, and other native fauna that use the lake as habitat.

Lewis and Clark State Park provides camping facilities, restrooms, and other park amenities for visitors. The park's proximity to the historic Lewis and Clark expedition route adds cultural significance to the area. Two local campgrounds and a summer camp operate near the lake, demonstrating its recreational value to the community.

Water levels can vary significantly, and the Iowa DNR has implemented speed restrictions during high water periods for safety reasons and to protect infrastructure. The lake has experienced extended periods of low water that threaten its viability as a recreational resource.

Paddlers should be aware that Blue Lake serves as a crucial recreational hub for the Onawa area, attracting families, tourists, and nature enthusiasts throughout the year. The lake's scenic beauty and tranquil waters when at normal levels make it an ideal location for paddling activities, though current water level conditions should be verified before planning a trip.