Grist Mill Trail

The Grist Mill Trail is a 5.0 mile long hiking and biking trail located in Patapsco Valley State Park in the Baltimore County side of the Patapsco Valley near Catonsville, Maryland.^[1] The paved pathway runs parallel to the Baltimore and Ohio Railroad to the north, and the Patapsco River to the south.

Grist Mill Trail
Length	5 mi (8.0 km)
Location	Patapsco Valley State Park
Established	2003
Trailheads	Lost Lake 39.23065°N 76.72950°W / 39.23065; -76.72950 Ilchester Road 39.24955°N 76.76490°W / 39.24955; -76.76490
Use	Walking, jogging, biking
Difficulty	Easy, level, ADA accessible
Season	Year-round
Months	Year-round
Sights	Patapsco Swinging Bridge
Surface	Asphalt
Trail map

The original segment of the path connected the Lost Lake to the Patapsco Swinging Bridge in the Avalon area of the park.^[2] In 2006, the trail was expanded to Ilchester Road, where a second swinging bridge was built atop the remains of the Patterson Viaduct. All together, the Grist Mill Trail travels from River Road in Relay, Maryland to Ilchester Road/River Road in Ellicott City, Maryland.^[3]