Diving atSouth Nine Mile Site (United States)
Rising from the seafloor, South Nine Mile Site in the United States presents a complex natural reef structure punctuated by artificial additions. Located approximately 10.4 nautical miles from the Mayport jetties, this area forms part of a larger reef system extending along the Florida coast from Jacksonville to Daytona Beach. It features sections that emerge from the sand and disappear again, creating varied topography for exploration.
Evening condition tracking at South Nine Mile Site features an air temperature of 22.7°C. We have recorded wave heights measuring 0.52m during this period. These figures outline the environmental parameters currently present.
Dive Site Coordinates
29.8718, -81.0455
Dive Site Overview
An evolving underwater habitat, South Nine Mile Site combines natural reef with over thirty years of dedicated artificial reef development. Divers explore multiple distinct wreck features here, including the Open Sided Barge, Vic’s Barge, and the 50-foot (15 m) steamer tug known as the Asphalt Barge, typically found near the reef's center.
These additions complement existing natural formations, enhancing the overall underwater topography. Maximum depths within the recreational range reach 23 m (75 ft), though many areas average around 21 m (70 ft). Rather than presenting as a continuous wall, the reef comprises a series of distinct elevations that rise from the seafloor before receding back into the sand, creating numerous ledges and hiding spots.
Visibility is generally reported around 9 m (30 ft), offering decent viewing conditions for both the wrecks and the varied reef features. Initially, fishermen recognized the site for its naturally abundant fish populations, a characteristic that continues to attract a rich diversity of species.
This rich environment later drew the interest of divers, along with those participating in lobstering and spearfishing activities. Varied structures across the site provide essential habitats for numerous marine species, ensuring each descent offers opportunities for new observations and encounters.
Best Time to Dive
Planning your dive around optimal visibility and comfortable surface conditions enhances the South Nine Mile Site experience. Average air temperatures range from 14.5°C (58°F) in January to 27.8°C (82°F) in August, suggesting warmer surface conditions during summer months. Water temperatures for this specific site aren't consistently reported, but often mirror seasonal air temperature trends in temperate regions, with a lag. Dive scores indicate 'Good' conditions generally from April to August, and again in November, aligning with periods of potentially calmer seas and better visibility. Conversely, months like September and October show moderate dive scores, largely due to increased rainfall, which averages around 5.8 mm (0.23 inches) and 4.1 mm (0.16 inches) respectively, potentially impacting visibility. Wave heights also tend to be lower from May through August, around 0.6-0.8 meters (2-2.6 feet), contributing to more favorable boat entry and overall dive comfort. Considering these climate patterns helps inform the best times to schedule a visit.
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
Descending into South Nine Mile reveals a dynamic environment where natural reef formations meet artificial structures. The currents can vary, influencing the drift characteristics across the site. Divers commonly encounter depths averaging 21 m (70 ft), but shallower sections are present, particularly around the reef tops, before the seafloor drops to the maximum depth of approximately 23 m (75 ft). Visibility, typically around 9 m (30 ft), allows for decent viewing of the wrecks and reef topography, though it can fluctuate with weather patterns and tidal movements. Exploring the structural complexity of barges and tugs feels like navigating an established underwater community. Expect to adapt your dive plan based on real-time conditions, as the interplay of current and visibility shapes the experience.
Dive Difficulty & Safety Guidelines
Navigating South Nine Mile Site demands attention to its varied depths and the presence of both natural and artificial structures. Given its maximum recreational depth, this site is generally suitable for Advanced Open Water divers or those with equivalent experience comfortable with deeper profiles. Divers should carry a dive computer and a surface marker buoy (SMB) for safety, especially if drift diving conditions are encountered. Always consult with local dive professionals regarding current conditions, as visibility can change, and currents may vary seasonally. This ensures you're prepared for the prevailing environment. Adhering to responsible diving practices, such as maintaining proper buoyancy and avoiding contact with marine life or reef structures, is critical for both diver safety and site preservation. Spearfishing and lobstering are popular here, so divers should be aware of others engaged in these activities.
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
With water temperatures around 23°C (73°F), many divers find a 3-5mm wetsuit provides comfortable protection.
Being prepared with flexible exposure options is a common approach among experienced divers.
The next few days appear likely to bring similar environmental conditions.
Conditions last reviewed: 18:00 using the latest environmental data.
Dive Logistics & Preparation
Hyperbaric Chamber
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Entry Requirements
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Currency
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Nearest Airports
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Marine Life at South Nine Mile Site
Within this underwater landscape, the diversity of marine life is supported by the blend of natural and artificial habitats. Grouper, often averaging 15 pounds (6.8 kg), are common residents, frequently found sheltering around the wrecks and reef ledges. Large flounder and sheepshead also inhabit the various structures, blending into their surroundings. Surface activities like bottom fishing in spring and summer yield species such as cobia, cuda, bonito, kingfish, and tuna, indicating a rich food chain throughout the area. Divers regularly encounter these species, alongside other bait and game fish, making the exploration of the reef a vibrant experience.
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Frequently Asked Questions
What is the typical depth range at South Nine Mile Site?
The South Nine Mile Site generally features an average depth of 21 m (70 ft). Divers can explore shallower sections around the reef tops, while the maximum depth reaches approximately 23 m (75 ft).
What kind of structures will I find at South Nine Mile Site?
This site offers a combination of natural reef formations and artificial reef structures. Notable features include several wrecks, specifically the Open Sided Barge, Vic’s Barge, and the Asphalt Barge, a 50-foot (15 m) steamer tug.
What is the general visibility like?
Visibility at South Nine Mile Site is generally reported to be around 9 m (30 ft). However, like many coastal sites, conditions can fluctuate based on recent weather patterns and tidal movements.
Is the site suitable for advanced divers?
Yes, given the maximum depth of 23 m (75 ft) and potentially varying currents, this site is generally suitable for Advanced Open Water divers. Divers should be comfortable with deeper recreational dive profiles.
What marine life is commonly seen here?
The site is home to diverse marine life, including grouper, often averaging 15 pounds (6.8 kg). Divers may also spot large flounder, sheepshead, and various other fish such as cobia, cuda, bonito, kingfish, and tuna.
When is the best time to dive this site?
Optimal dive conditions, indicated by 'Good' dive scores, typically occur from April to August, and again in November. These periods often correspond with lower wave heights and potentially better visibility.
Are there any specific hazards to be aware of?
While no unique hazards are consistently reported, divers should be mindful of varying currents that can impact drift characteristics. Additionally, be aware that lobstering and spearfishing are popular activities at this site.
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