Mill Cove is a coastal saltwater feature along the northern reaches of the St. Johns River in Jacksonville, Florida. The primary public access for paddlers is the Lonnie Wurn Boat Ramp & Park, located at 4121 Ferber Road. This launch provides a single-lane concrete boat ramp suitable for kayaks, canoes, and SUPs, though its usability is strongly influenced by tide. The ramp and its entrance channel are very shallow at lower tides, which is a critical planning factor. The park offers amenities including a nonmotorized launch area, restrooms, picnic shelters, a playground, and both free and paid parking. The cove's level of boat traffic is influenced by tides, suggesting higher motorized use during favorable high water.

Paddlers must plan their trips around the tidal cycle. Launching and returning should be timed for mid to high tide to navigate the shallow ramp and channel safely. The cove is directly connected to the broader St. Johns River, so paddlers will encounter open water conditions. Exposure to wind and waves from the river, as well as potential boat traffic in the main channel, are significant safety considerations. There are no specific surf zones at this launch, but the open river connection means conditions can change. The area is part of a developed recreational park with a fishing pier, and the surrounding views are of a typical urban waterfront. Manatee education signage is present, indicating these protected mammals are part of the local wildlife.