Here's a link to the MO Conservation Department
Missouri Department of Conservation
On the left side of the page there is a column labeled "Quick Links"... Click on "Conservation Areas" That will take you to the MO Conservation Atlas that lists ALL lands and lakes managed by the Conservation Department. Select the county to search (Clay, Platte, DeKalb)... It's a good place to start. You can run a search on this forum to see if anything's been posted on a particular lake.
Seems like more and more fishermen are looking to the little lakes.