scubamarco.com · Operator
Marco Island dive shop providing local dive trips, equipment, and instruction.
Dive Spot Guide•
Third Reef
Offshore artificial reef near Marco Island.
Local operator required
Local Marco Island dive shops run the boat days and help pick the reef section.
Boat-access artificial reef offshore from Marco Island with concrete piles, resident fish, and straightforward day-trip logistics.
About Third Reef
Third Reef is one of Collier County's offshore artificial-reef piles near Marco Island, built from concrete blocks and culverts and spread across a broader reef field. It is the kind of Gulf dive you plan as a boat day for structure, goliath grouper, and fish life rather than for dramatic depth.
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Research Estimate At Third Reef
Conservative baseline from public research. No community dives logged yet.
AccessModerate entry effort
CoralMixed health
Aquatic LifeExceptional variety
FacilitiesGood facilities
Crowd / PopularityQuite busy
Where Is Third Reef?
This spotNearby spotsExplore nearby spots on the map
Community sourced coordinates.
Third Reef Planning Details
Depth range, seasonality, and planning context.
Reported Depth
12m - 14m
Depth Note
Public sources place the reef piles in roughly 40 to 45 feet of water, with multiple concrete and culvert structures across the reef field.
Best Season
Year-round when Gulf conditions are settled.
Typical Conditions
Offshore artificial reef with concrete blocks and culverts, resident fish, and a layout that rewards a light.
Safety & Access At Third Reef
Site conditions, restrictions, and access requirements.
Site Conditions
Boat trafficWaves
Safety Notes
File a float plan and fly a diver-down flag. Keep track of your boat, your surface position, and the weather because Gulf conditions can change quickly.
Access Restrictions
Boat access from Marco Island and Naples dive shops is normal, and reef visits are first-come, first-serve on the water.
Legal Notes
Florida diver-down flag rules apply, and divers should stay within 100 feet of their vessel while the flag is up.
Local Intel For Third Reef
Community notes to help plan your visit.
Scuba Diving
Good for reef photography and structure exploration; a light helps with the culverts and stacked blocks.
Freediving
Not the normal use case for this offshore boat reef.
Snorkeling
Possible only if conditions are calm and the operator is comfortable with snorkelers.
Wildlife at Third Reef
Species commonly reported at this site, with direct links into their wildlife guides.
Recent Logged Visits At Third Reef
Community dive logs and visit reports for this site.
Dive Spot Log Averages At Third Reef
Average conditions based on logged dives & visits.
No community dive data has been logged here yet. Be the first to record a dive and seed the averages.
