Bonne Terre Mine
Conditions
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Marine forecast via Copernicus Marine. Score is a rule-based guide from swell/wind vs. the site's exposure — always dive your own assessment.
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About this site
Bonne Terre Mine sits beneath the town of Bonne Terre, Missouri, in an old lead mine that operated from the mid-1800s into the 20th century. After mining stopped, groundwater filled the lower levels, creating a flooded underground system now used for cavern and cave diving tours. The site is known for extremely clear water, since it is enclosed and undisturbed by weather or runoff, and for the mining relics such as ore carts, tools, and timbers left in place underwater. Divers move through man-made tunnels and chambers rather than natural rock formations, with artificial lighting installed to illuminate the passages. Because it is an overhead environment, diving here typically requires guided access through the operation that manages the site.
AI overviewDurable tips from divers — access, hazards, marine life, facilities. For day-of conditions, use the report tool in the conditions card above.
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