Based on the latest available information, the San Juan Avenue 5434 boat ramp in Jacksonville, Florida is a concrete ramp with a length of approximately 50 feet and a width of approximately 20 feet. It provides access to the Ortega River, which is a tidal river that flows into the St. Johns River.

The boat ramp is designed to accommodate small to medium-sized watercraft, including motorboats, kayaks, canoes, and paddleboards. There are no restrictions on the type of craft that are permitted to use the ramp, but users are reminded to follow all safety regulations and guidelines.

In addition to the boat ramp, the facility also features a large parking lot for vehicles and boat trailers, as well as restrooms and picnic areas. The ramp is maintained by the City of Jacksonville and is open to the public year-round.

It is important to note that the information provided may be subject to change, and it is always recommended to verify the latest details and regulations with the appropriate authorities before planning a boating trip.