Based on the available information, the boat ramp named Nature Trail Emmons County in North Dakota is a public boat ramp that is open to the public year-round. The ramp is 12 feet wide and is located on the south shore of Lake Oahe, which is one of the largest reservoirs in the United States.

The Nature Trail Emmons County boat ramp provides access to Lake Oahe, which is a popular destination for fishing, boating, and water sports. The lake spans across North Dakota, South Dakota, and Montana, and covers a total area of 370,000 acres.

According to North Dakota Game and Fish Department regulations, all types of boats are permitted on Lake Oahe, including motorboats, sailboats, canoes, kayaks, and paddleboards. However, boaters are required to follow all safety regulations, including having proper safety equipment on board, and obeying all speed and wake restrictions.

It is important to note that the available information may not be up to date, and boaters should always verify current regulations and conditions before launching their watercraft.