There are 2 Big Rock Campgrounds in NH and they are very different! This is not the resort campground convenient to ATV trails, but a rustic campground offering large, level, wooded sites along the Kancamagus Highway just 2 miles east of the Lincoln Woods Visitor Center. It's a great location for exploring the sites and beautiful vistas along the Kancamagus, easy access to Franconia Notch and Lincoln, NH. Lincoln also offers a grocery store, restaurants, stores selling outdoor gear, moose tours, and adventure tours (zip/climbing).
Some of the sites are tent only, with parking separated from the tent pad/fire ring/picnic table. Others are large and level with ample space for RVs. You'll get some traffic noise, but there's less here than at places along 3 & 93.
There are no reservations; all sites are first-come, first serve and it's open from mid-May to mid-October. Bring cash or a check to pay for your campsite. It's self-service with an iron ranger. Fee (2018) is $22, an extra $5 for a second car.
Water is available. There are vault toilets and no showers. No cell phone service.