Maryland Route 77 (MD 77) is a state highway in the U.S. state of Maryland. The state highway runs from MD 64 in Smithsburg east to MD 194 in Keymar. MD 77 is the main east–west highway of northern Frederick County. The state highway connects Thurmont with eastern Washington County via Foxville, which lies between South Mountain and Catoctin Mountain near Catoctin Mountain Park and Cunningham Falls State Park. MD 77 links Thurmont with western Carroll County through the communities of Graceham, Rocky Ridge, and Detour in the Monocacy River valley. MD 77 was constructed from Thurmont east to Detour in the 1920s and early 1930s. A disjoint section of MD 77 was built between Cavetown and Foxville in the late 1930s. The portions of the modern highway between Foxville and Thurmont and from Detour to Keymar were county highways until they were designated part of MD 77 in 1956. MD 77's western terminus was moved east to MD 64 in Smithsburg in 1960.
Route description
MD 77 begins at an intersection with MD 64 (Smithsburg Pike) in Smithsburg. The roadway continues northwest as county-maintained Leitersburg Smithsburg Road into the town of Smithsburg, where it becomes that town's Main Street, then continues northwest to Leitersburg. MD 77's first intersection east of MD 64 is Wolfsville Road, which becomes MD 17 at the Washington–Frederick county line and heads into the Middletown Valley. MD 77 heads east as Foxville Road, a two-lane undivided road that passes through several sharp curves as the highway ascends South Mountain. The state highway passes Pleasant Valley Road before it reaches its highest point at the Washington–Frederick County line. East of Foxville, MD 77 begins to follows the boundary between Cunningham Falls State Park to the south and the National Park Service-managed Catoctin Mountain Park to the north. Catoctin Mountain Park contains three historic camps: Camp Greentop, Camp Misty Mount, and the Presidential retreat Camp David.
MD 77 follows a curvaceous route along the narrow valley of Hunting Creek to descend Catoctin Mountain. The state highway emerges from the mountain valley just west of the town of Thurmont, where the highway becomes Main Street and meets U.S. Route 15 (US 15, Catoctin Mountain Highway) at a partial cloverleaf interchange. MD 77 intersects Church Street and Water Street in the center of town; Church Street heads north as MD 550. The two state highways run concurrently through the eastern part of Thurmont until MD 550 heads south as Jimtown Road and MD 77 continues east as Rocky Ridge Road. MD 77 leaves the town of Thurmont and passes through the village of Graceham, where the highway passes northwest of Graceham Moravian Church and Parsonage and has a one-lane underpass of the Maryland Midland Railway. The state highway passes through farmland and traverses Owens Creek just west of Old Frederick Road, which crosses the creek to the south on the Loys Station Covered Bridge. Another historic bridge across Owens Creek, the Old Mill Road Bridge, is accessed by Old Mill Road just east of Loyds Station.
MD 77 passes under the railroad again just west of Rocky Ridge, where the highway meets the southern end of MD 76 (Motters Station Road). The state highway crosses the Monocacy River on a through truss bridge at Millers Bridge just south of the confluence of the Monocacy River and Double Pipe Creek. A short distance to the east, MD 77 crosses Double Pipe Creek and enters Carroll County at the village of Detour, which is located just north of the confluence of Big Pipe Creek and Little Pipe Creek to form Double Pipe Creek. The state highway continues east as Middleburg Road, which intersects the Maryland Midland Railway at grade and crosses Big Pipe Creek before reaching its eastern terminus at MD 194 (Francis Scott Key Memorial Highway) in the village of Keymar, which sits at the junction of the Maryland Midland Railway's east–west and north–south rail lines. Middleburg Road continues east as a county highway that passes through Middleburg and Uniontown before continuing as Uniontown Road toward Westminster.