Not just to visit but for boat launch and rentals and fishing there are fees. 2019 Ni River / Hunting Run Reservoir Fees http://www.spotsylvania.va.us/filestorage/15913/15925/16011/2019HuntingRunNiRiverRulesandRegulations.pdf
There are several alternatives that don't cost money, but you'll spend as much or more on gas getting to those places
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