The boat ramp named Munson Highway 401-599 is located in Milton, Florida. It is a concrete boat ramp that provides access to the Blackwater River. The ramp is approximately 16 feet wide, which allows for easy launching and retrieval of small to medium-sized vessels. The coordinates of the ramp are latitude: 30.6321907, longitude: -87.03756714.

According to the latest information available, the Blackwater River is open to a variety of watercraft, including motorized boats, canoes, kayaks, and paddleboards. However, there may be restrictions on boat speed and size depending on the area of the river you are in. It is always recommended to check with local authorities for any special rules or regulations before launching.

Overall, the Munson Highway 401-599 boat ramp is a popular spot for boaters and paddlers looking to explore the beautiful scenery of the Blackwater River in Florida.