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Based on the latest information available, the Jeffrey WMA boat ramp in Nebraska is a concrete boat ramp that is approximately 16 feet wide. The boat ramp provides access to the Medicine Creek Reservoir, which is located in Frontier County, Nebraska.

The Medicine Creek Reservoir is a popular recreational area that allows for a variety of water activities, including boating, fishing, and swimming. The reservoir covers approximately 1,850 acres and has a maximum depth of 60 feet.

As for what kind of craft are permitted on the water, it appears that most types of boats are allowed on the reservoir. However, there may be restrictions on certain types of watercraft during certain times of the year or in specific areas of the reservoir. It is always best to check with local authorities or consult the latest regulations for the area before launching a boat.

Overall, the Jeffrey WMA boat ramp is a popular access point for those looking to enjoy the Medicine Creek Reservoir in Nebraska. Its convenient location and wide concrete ramp make it a popular destination for boaters and anglers alike.