Directions From Us-98 N To 6505 Dorchester Rd: Head North On Us-98 N Toward Marcum Road. Turn Right Onto Marcum Road. Continue On Marcum Road For Approximately 0.5 Miles. Turn Left Onto Walt Williams Road. Proceed On Walt Williams Road For About 0.3 Miles. Turn Right Onto Dorchester Road. Continue On Dorchester Road For Approximately 0.2 Miles. 6505 Dorchester Road Will Be On Your Right.