Catoctin Mountain Highway, Jefferson National Pike, Frederick Freeway

Southern Terminus:
Virginia-Maryland state line
Northern Terminus:
Maryland-Pennsylvania state line
37.85 miles

US 15 is a north/south route extending from Walterboro, South Carolina, to Painted Post, New York. It enters Maryland from Virginia by crossing the Potomac River via the Point of Rocks Bridge. The first section is called Catoctin Mountain Highway and is a two-lane undivided road with a 55 MPH speed limit. After a few miles, it merges into Jefferson National Pike (US 340), which is an expressway. In Frederick, Jefferson National Pike ends at the Frederick Freeway (US 40). The two routes are multiplexed for one exit, and then US 40 splits to the west onto West Patrick Street. US 15 follows the Frederick Freeway for the remainder of its length. Beyond the end of the freeway, US 15 is known as Catoctin Mountain Highway again. It is a four-lane divided highway with a mixture of at-grade intersections and grade-separated interchanges until the border with Pennsylvania. Just south of the state line, there is a business route along Seton Avenue through Emmitsburg.

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Copyright © 2003-2021 by David Golub. All rights reserved. The author would like to thank William Roll for contributing photographs and LC for contributing documents to this web site. You may not reproduce any text or photographs on this web site without express permission from the author. Hotlinking of images from this site is strictly prohibited. Route symbols based on graphics from Central PA/MD Roads and Wikipedia. Map icons by