St. Louis Region
Route 66 and Meramec Caverns put karst on display
Franklin County's Route 66 corridor and well-known show caves reflect the area's karst geology, which also matters for groundwater and land near the river.
Route 66 does more than carry travelers through the Stanton and Sullivan side of Franklin County. It also runs through a landscape where caves make the county’s karst easy to see. The show-cave signs are the public face of the same limestone setting that shapes springs, sinkholes, and groundwater below nearby farms and home sites.
Karst is simple to describe and easy to underestimate: water moves through cracks, channels, and openings in the rock. That can make cave country beautiful, but it also means runoff, wells, septic systems, and sinkhole questions deserve care. A dry-looking hollow or pasture can still connect to water moving underground.
For a visitor, the caves are part of the old Route 66 story. For a resident or land buyer, the same caves are a reminder to treat groundwater and drainage as local facts, not footnotes. Use Missouri State Parks for nearby public natural areas and Missouri DNR’s geology material for the karst side of the question.
References
Where this fits: this note belongs to Franklin County. See every local note for the county on its page.