This hike leaves Ellicott City Parking Lot A (next to the Trolley Stop Restaurant) and proceeds up Oella Avenue to the old Oella textile mill. Taking the mill race trail the hike follows the Patapsco Thru trail on the Baltimore County side of the river. After carefully crossing the Old Frederick Road bridge the hike hops on the trail heading south to the Old Ellicott City (OEC) connector trail. After the end of the OEC connector the hike proceeds to…