2021 Map of Columbia Bottom

About this map

The confluence area where the Missouri River meets the Mississippi River creates a complex landscape of shifting islands and industrial waterways. Settled communities like Spanish Lake and Glasgow Village sit on the higher ground west of the river bottoms, while the lowlands are dominated by expansive features such as Cora Island and Columbia Bottom. The map documents the intricate river management infrastructure, including Lock and Dam 26 and the Chain of Rocks Canal, which facilitate navigation past the natural Chain of Rocks shoals.