It really depends if the river is located within the campgrounds boundaries. Some campgrounds that have rivers within their area allow fishing directly from their campground without a fishing license. In others state you will need a fishing license for that state.
If the river is locate away from the campground, you will have to check with the state's DNR to see if they require a fishing license for fishing those rivers.
2011 Chevy Suburban 2500 4x4
2015 Kodiak 300BHLS