Per DNR regulations, "structures such as swimming rafts, boat lifts, slalom courses, ski jumps, etc., which do not extend from shore, cannot be placed in the water between sunset and sunrise without first obtaining a permit from the county sheriff."

Permits are available from the Sheriff's Office during normal business hours.  Cost is $2.00 per year but are sold in 5-year increments.

 Additional rules about rafts and other structures are:

• The permit number must be painted on the raft.
• The structure must have a light visible in all directions or be reflectorized so as to reflect light in all directions.
• Placement of the structure may be altered at the direction of the sheriff should it interfere with navigation.

 Minnesota Administrative Rules