The two major highways paralleling the park, Nebraska 12 and South Dakota 50, are paved. In the winter be alert for snow and ice on the surfaces. Winds are primarily from the north-northwest, with snow being driven across the east-west highways.

Most of the roads leading to river accesses are gravel or dirt. These surfaces can turn slippery--similar to icy roads--in the spring and after heavy rains. Drive carefully and slowly on these roadways. During the summer months, these roads can turn very dusty. Stay back from any vehicle in front so as not to impede your vision.

The area surrounding the park is rural and primarily agricultural. Always be alert for slow moving farm vehicles, regardless of the season.