Jackson Blue Spring is an advanced shore dive site in Florida, United States with depths of 5–27.4 m (16–90 ft). Typically most favorable Jul · from 3 years of archive data. Divers commonly see Largemouth bass, Bluegill, and American eel. Check the latest conditions and entry details before you go.
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Site hazards: Extensive overhead cave system with strong outflow at the entrance
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Best: SunFavorable windowModerate window— no window
First light 5:58 · Sunrise 6:22 · Sunset 18:51
Source: Open-Meteo wind · graded 1h ago
Forecast only — always assess conditions on site.
Dated firsthand observations from divers — not current conditions.
No diver reports for this site yet. — one dated observation helps every diver after you.
Based on community reviews and site data. Conditions vary — always verify before diving.
What conditions have historically been typical at this site, month by month — not a forecast.
July hastypically had the largest share of favorable days here. Conditions vary year to year — this is historical context, not a forecast.
Based on 3 years of archive data. Bar height shows the share of days each month whose conditions have historically scored favorably.
Species noted at this site — not a promise of what you’ll encounter.
No dive shops mapped within 25 km. Know one? Add it to the map.
Data updated June 2026
Jackson Blue Spring is a first-magnitude spring at the head of Merritt's Mill Pond near Marianna and one of the most popular full-cave dives in the United States. The entrance at the main vent leads into miles of mostly large, clear, white-limestone passage with notable flow, commonly dived with stages and DPVs. Access is by permit through Cave Adventurers with a gate code for year-round entry; the basin doubles as a county swim park in summer.
Extensive overhead cave system with strong outflow at the entrance — Full Cave certification required. Hazards: high flow (strenuous entry against current), silting in side passages, long penetrations commonly done with stages/DPVs, navigation complexity. Spring basin is closed to divers' staging during summer swim season hours; permit and gate-code system controls access.
Jackson Blue Spring is rated as advanced difficulty, which may not suit new divers. Listed depths run from 5 to 27.4 metres (16–90 feet). Access is from shore, with the entry recorded as an easy walk-in. Consider your experience level, conditions, and local guidance before planning.
Jackson Blue Spring ranges from 5 to 27.4 metres deep (16–90 feet). It is a freshwater site rated as advanced difficulty. Depths vary across the site, so plan your profile to your training and verify conditions locally.
Jackson Blue Spring is a shore dive — you can enter from land. The entry is recorded as an easy walk-in. The entry area is recorded as sheltered from surge. Basic facilities are recorded at or near the site, and cell service is recorded as good. Entry details and parking notes, where known, are listed in the access section of this page.
Year-round for permitted cave divers (72 F water, typically excellent visibility); off-season (after Labor Day to before Memorial Day) avoids swim-season crowds and access restrictions. Conditions vary, so check the latest reports and forecasts on the dive site page before your trip.
Divers at Jackson Blue Spring in United States commonly report sightings of Largemouth bass, Bluegill, American eel, Suwannee cooter (turtle), and Georgia blind salamander. Largemouth bass, Bluegill, and Suwannee cooter (turtle) are recorded as common sightings, while American eel and Georgia blind salamander are reported only occasionally. Marine life varies by season and conditions—check the site page for recent diver observations and photos.
Extensive overhead cave system with strong outflow at the entrance — Full Cave certification required. Hazards: high flow (strenuous entry against current), silting in side passages, long penetrations commonly done with stages/DPVs, navigation complexity. Spring basin is closed to divers' staging during summer swim season hours; permit and gate-code system controls access. Hazards and conditions change, so verify current local information before diving.
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