Columbia Bottom Conservation Area offers public access to the Missouri and Mississippi Rivers at their confluence in north St.

Louis County, featuring a concrete boat ramp on the Missouri River and a separate canoe/kayak access point on the Mississippi River (seasonal closure October 15 through end of duck season). The area provides 6.

5 miles of river frontage with paved and gravel roads, parking areas, and a visitor center, though flooding has impacted some facilities and the area is open 30 minutes before sunrise to 30 minutes after sunset daily.