Great Roads In Minnesota N. Dakota

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Planning a ride from the Madison, WI area into and across Minnesota and into North Dakota. Would like to visit the headwaters of the Mississippi River in MN and don't have a lot of time for long trek to western North Dakota. The ND rides will probably need to be no further north than Fargo and no further west than the middle of the state. I have done some route planning, but there doesn't seem to be much in the way of curvy or scenic roads in SE North Dakota.

Thanks in advance.

MTC