MDOT SHA Partially Opens US 15/Monocacy Boulevard Interchange in Frederick County

Temporary Detour Required as Part of Traffic Shift.


July 20, 2018) – On Monday morning, July 23, the Maryland Department of Transportation State Highway Administration (MDOT SHA) will open the Monocacy Boulevard Bridge over US 15 and a new ramp, which are both part of the US 15 (Catoctin Mountain Highway)/Monocacy Boulevard Interchange project in Frederick. Construction on the project will continue through fall when the entire interchange should be available to motorists.

New traffic movements opening Monday are:

  • Four-lane Monocacy Boulevard Bridge over US 15;
  • Monocacy Boulevard ramp to northbound US 15. Motorists now have an option to turn left at the traffic signal or use this new ramp to merge onto northbound US 15;
  • Thomas Johnson Drive connection to Christophers Crossing (west of US 15) will be assessible via a new traffic signal; and
  • Pedestrians and bicyclists will have access to a large section (nearly one-half mile) of a new hiker/biker trail on the north side of Monocacy Boulevard, which will connect trail users to area neighborhoods on either side of US 15.

To prepare for these changes, MDOT SHA crews will detour traffic, which will provide motorists with access to Monocacy Boulevard from US 15:

Northbound detour:  Motorists will be detoured prior to Monocacy Boulevard to northbound US 15 to eastbound MD 26 and back to Monocacy Boulevard.