From Harford County government:
A portion of Knopp Road is closed to traffic on July 14, 2014 for approximately two weeks for repairs. The area affected at Rock State Park is located between Rush and Rocks Chrome Hill Roads. The work site is located 300 yards east of Rocks Chrome Hill Road.
Detour and warning signs are posted in the area. This is a full time closure. Please make other arrangements if you travel on this roadway. If you have any questions, please call Dan Hammons, Supervisor Bridges DPW Highways at 410-638-3533 Ext. 2255.