A lifetime state park entrance permit is free if you have a service-connected disability rating of 50 percent or more or you are a former prisoner of war. Surviving spouses of veterans who had a rating of 50 percent or more are eligible too. If your rating is under 50 percent you can buy an annual entrance permit for $28.
Send the North Dakota Parks and Recreation Department Disabled Veteran and POW Lifetime State Park Entrance Permit Application, your documentation and the fee if one applies to the North Dakota Parks and Recreation Department, 604 E Boulevard Avenue Dept 750, Bismarck ND 58505. For questions email parkrec@nd.gov or call 701-328-5357.
A current VA Summary of Benefits letter as proof of your disability rating, or a copy of a DD214 showing former prisoner of war status.