Conditions
Scored by DiveConnect's site-physics model
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
Mermet Springs is a flooded limestone quarry in southern Illinois, near Vienna in Johnson County. It draws inland divers from the region for freshwater diving in a former quarry setting rather than any ocean or lake shoreline, and it is generally considered a beginner 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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