There is only street parking available, but there is plenty of room to park. I would just recommend moving your vehicle once very 48 hours if you're staying for an extended period. None of the city parks in Nampa have designated rv parking, but there are a few rv lots for rent, as well as storage facilities that offer rv storage, if you're looking for a longterm solution.
Only street parking and I agree move every 24-48 hours to avoid any problems
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