Jurassic Spring, Crystal River: Freshwater spring diving in Kings Bay

Jurassic Spring is a compact, second-magnitude freshwater spring situated within the Hunter Springs Run area of Kings Bay. The site forms a roughly oval basin, measuring approximately 30 metres in length and 15 metres in width. As you approach, you will find the spring vents feeding clear, stable water into the surrounding bay. The topography is relatively simple, consisting of a sandy and silty bottom populated with various types of aquatic vegetation.

The spring is notable for its historical and paleontological significance, having been named after mammoth fossils discovered within the basin. This history adds a layer of interest to the dive as you navigate the small area. The water temperature remains consistent, typically between 22 and 23°C, which is regulated by the constant discharge from the spring vents. This thermal stability is a defining characteristic of the site's environment.

Accessing the site requires careful planning depending on your mode of transport. You can reach the spring by small boat or by swimming and kayaking from Hunter Springs Park along the Hunter Springs Run channel. If you choose the shore entry at the park, you will need to swim approximately 300 metres to reach the spring itself. Always ensure you are using a dive flag when navigating through the channel to maintain safety in this area.

The movement of water at the site is primarily driven by the spring discharge. However, the tidal state of Kings Bay does exert an influence on the local conditions. You may encounter mild currents that shift depending on the tide, which can cause slight changes in depth perception or water movement. During periods when manatee protection closures are in effect, boat traffic in the area stops, resulting in much calmer conditions.

The fauna at Jurassic Spring is representative of the local freshwater ecosystem. You can observe West Indian manatees (Trichechus manatus) using the spring, as it is one of the primary locations for them in the Crystal River area. Other resident species include the Florida gar, largemouth bass, bluegill, and striped mullet. These animals are adapted to the specific vegetation and water clarity provided by the spring vents.

As you move along the bottom, keep an eye out for more specialized fish species like the snook, common mojarra, sheepshead, and mangrove snapper. The presence of aquatic vegetation provides various hiding spots and habitats for these residents. The visibility at the site is generally good, ranging between 10 and 20 metres, allowing for clear observation of the basin and the surrounding vegetation.

Seasonal changes significantly impact the way you experience this site. From November to March, the area sees peak manatee presence, making it a focal point for wildlife observation. During the months from April to November, recreational access is often more consistent because manatee-related closures are less frequent. It is important to check local regulations, as access can be restricted during the winter months to ensure the protection of the manatee population.