Based on the latest information available, the KY 399 Heidelberg boat ramp is located in Lee County, Kentucky, and it provides access to the Kentucky River. This boat ramp is reportedly a concrete ramp and is said to be relatively narrow. The width of the boat ramp is not specified in the available information.

According to the Kentucky Department of Fish and Wildlife, the Kentucky River is home to many different species of fish, including bass, catfish, and crappie. Therefore, it is safe to assume that boats that are commonly used for fishing are likely to be permitted on the water. However, it is important to note that the specific restrictions and regulations may vary depending on the location and time of year.

In conclusion, the KY 399 Heidelberg boat ramp is a concrete ramp located in Lee County, Kentucky, that provides access to the Kentucky River. While the width of the ramp is unknown, it is likely that it is suitable for small- to medium-sized boats. Given that the Kentucky River is known for its fishing opportunities, it is safe to assume that fishing boats are permitted on the water.