Campgrounds in New Hampshire's White Mountain National Forest are open, but the Forest Service is warning people that some areas still have snow, and spring melt-off can lead to some slippery footing. The Forest Service says heavy rainfall and slower seasonal changes also can cause stream crossings to be high and footing slick. Campers also need to be wary of bears and invasive insects. Campers are advised to properly store all food and drink, and empty food wrappers. Campers can introduce invasive insects to the area by bringing firewood from home; they need to buy firewood locally. Hikers can check out the HikeSafe website for travel plans at www.hikesafe.com.