Gunpowder Falls State Park is a 10 mile hiking trail in Kingsville, Maryland.
There are everal places to park to ride these trails. These directions are for the parking area on Harford Road. If you're heading west on 695 (towards Towson), take exit 31B, MD 147, Harford Road N. Stay on Harford Road for 9.3 miles. There are parking areas on both sides of Harford Road, one on the left on the Baltimore County side of the Little Gunpowder River, and one on the right on the Harford County side.
http://www.tripleblaze.com/trail.php?c=3&i=7857