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After conducting research, I could not find any information on a boat ramp named Graske Crossing Boat Ramp in Nebraska. It is possible that the name may have been misspelled or that the ramp no longer exists.

However, I can provide general information on boat ramps in Nebraska. Boat ramps in Nebraska can vary in size and type, with some being concrete and others being gravel. The width of a boat ramp can also vary, with some being as narrow as 10 feet and others being as wide as 30 feet.

The body of water serviced by a boat ramp in Nebraska will depend on its location. Nebraska has several major rivers, including the Missouri, Platte, and Niobrara, as well as many lakes and smaller bodies of water.

The types of watercraft permitted on a body of water will depend on the specific regulations for that location. Generally, motorized boats and non-motorized boats are permitted on most bodies of water in Nebraska. Some bodies of water may have restrictions on boat size or engine horsepower. It is important to check local regulations before launching a boat.