Diving atSt Marks Reef B4 (United States)
St Marks Reef B4 is an actively developing artificial reef system along the coast of Wakulla and Franklin County, United States. These purpose-built structures are continually transforming previously barren seafloor into new marine habitats. Significant grant and private funding support its ongoing expansion, creating lasting tributes and fostering a diverse underwater ecosystem for both marine life and divers.
Tonight's objective overview for St Marks Reef B4 shows an air temperature of 21.9°C. The measured surface conditions include wave heights around 0.42m. This environmental data is logged for the close of the day.
Dive Site Coordinates
30.0016, -84.1525
Dive Site Overview
This site offers an intriguing dive into a designed marine habitat, specifically constructed to enhance the biodiversity of Florida's Big Bend Coast. St Marks Reef B4 features various artificial structures, including 4.6 m (15 ft) tall "super reefs" and 2.4 m (8 ft) "Florida specials," all crafted from natural Florida limestone.
Placed in approximately 18 m (60 ft) of water on a sandy bottom, the reef system attracts marine life quickly, with full maturation taking several years. Divers here get to observe the dynamic process of an ecosystem establishing itself, from early invertebrate colonization like sponges and corals to the aggregation of various fish species. It's part of a larger 10-mile reef system, providing a structured environment where one didn't exist before.
The ongoing evolution of these reefs means each visit can offer new insights into marine development and interaction within these artificial environments.
Best Time to Dive
For optimal conditions, October and November typically present the best time to dive St Marks Reef B4, with dive scores rated as 'Excellent'. During these months, air temperatures average around 22°C (72°F) and 18°C (64°F) respectively, coupled with notably low rainfall. Water temperature is not consistently reported for this specific site, but regional patterns suggest pleasant conditions into the fall. The period from May through September also rates 'Good' for diving, often featuring warmer air temperatures peaking near 28°C (82°F) in July and August, though these months tend to see higher average rainfall and wind speeds can be variable. Divers should monitor local forecasts for the most current sea state information.
Climate Historical Averages
Monthly records compiled from satellite and marine observation nodes over the last 3 years. Data provided by Open-Meteo and MET Norway.
Dive Experience & Conditions
Diving at St Marks Reef B4 primarily involves exploring its artificial limestone structures, which rest on a mostly sandy seafloor at a maximum depth of 18 m (60 ft). These structures vary in size, providing complex surface areas for marine growth and shelter. Surface water temperatures in May have been observed around 26.7°C (80°F), suggesting comfortable conditions during warmer months. While the aim is to provide accessible diving, local conditions can vary, with some reports indicating rougher than expected seas occasionally. Visibility depends on currents and recent weather, typical of nearshore Gulf waters. This site is suitable for recreational divers seeking to explore developing artificial reef environments.
Dive Difficulty & Safety Guidelines
Certified divers exploring St Marks Reef B4 should prioritize excellent buoyancy control to protect the developing reef structures and avoid stirring up the sandy bottom, which can reduce visibility. Given that this site is also a known fishing location, displaying a dive flag prominently is essential for diver safety. It alerts nearby boaters and anglers to your presence underwater. Always plan your dive thoroughly, considering currents, and maintain awareness of boat traffic on the surface.
Recommended Equipment
No verified equipment items yet.
Verified equipment recommendations for this dive site are being reviewed and may be added as additional source checks are completed.
Recommended Dive Suit
Divers planning relaxed exploration may appreciate the warmth of 3-5mm wetsuit. A hood or vest is suggested for sensitive divers due to surface winds. Surface intervals may feel cooler. Divers often notice that perceived temperature can feel cooler during deeper or longer dives.
Conditions at St Marks Reef B4 currently place the water temperature near 24°C (74°F). Surface air temperatures are resting at 22°C (71°F).
Conditions are expected to stay fairly consistent in the days ahead.
Conditions last reviewed: 18:00 using the latest environmental data.
Dive Logistics & Preparation
Hyperbaric Chamber
Check local United States medical facilities.
Entry Requirements
View United States Visa Hub
Currency
USD
Nearest Airports
Nearest airports to help plan travel to this dive area.
Marine Life at St Marks Reef B4
The structured limestone environment of St Marks Reef B4 serves as an immediate draw for diverse marine life. Divers often encounter remoras, stingrays, small black sea bass, and grunts utilizing the shelter and food sources provided by the artificial habitat. Larger pelagic and reef-dwelling species such as cobia, various grouper, and king mackerel have also been observed. The reef continues to mature, attracting invertebrates like sponges and corals, which further enrich the underwater landscape and support a growing community of marine organisms.
Dive Centers Near St Marks Reef B4
No Dive Centers Local To St Marks Reef B4
Are you a dive center visiting this location? Get listed to reach divers.
Frequently Asked Questions
What kind of structures comprise St Marks Reef B4?
St Marks Reef B4 is composed of man-made structures, specifically 4.6 m (15 ft) "super reefs" and 2.4 m (8 ft) "Florida specials." These are primarily constructed from natural Florida limestone, designed to create a complex underwater habitat.
What is the typical depth at St Marks Reef B4?
Artificial reef structures rest at approximately 18 m (60 ft) deep. Its surrounding seafloor is sandy, establishing a recreational depth dive environment.
When is the best time to dive this site?
October and November are generally considered the best months for diving at St Marks Reef B4 due to 'Excellent' dive scores, cooler air temperatures, and lower rainfall. Summer months also offer good conditions but may have more rain.
What marine life can be observed at St Marks Reef B4?
Many species are drawn to the artificial reef, such as remoras, stingrays, small black sea bass, and grunts. Divers may also spot larger fish like cobia, grouper, and king mackerel, alongside developing sponges and corals.
Is St Marks Reef B4 suitable for beginner divers?
The site is within recreational dive limits (18 m / 60 ft) and involves exploring artificial structures. While accessible for certified divers, good buoyancy control is beneficial for navigating the reef and protecting its developing ecosystem.
Are there any specific safety precautions to consider?
Due to shared use with anglers, divers must display a dive flag to ensure surface safety and alert other boaters. Maintaining good buoyancy control is also crucial to avoid damaging the reef or stirring up the sandy bottom.
Liveaboards Sailing to St Marks Reef B4
Explore highly rated liveaboards visiting this dive site and discover the best routes in United States.
Resorts & Accommodation
Find partner hotels and dive resorts directly accessing the reef.
Around This Area
Explore top-rated restaurants, activities, and attractions near St Marks Reef B4 reviewed by travelers.
Planning to dive St Marks Reef B4?
Send one inquiry and receive offers directly from the best verified local dive operators.