MD 173 continues west as a four-lane undivided highway through the industrial area of Hawkins Point. The state highway passes MD 172 (Arundel Cove Road) and then the access road to the U.S. Coast Guard Yard. MD 173 crosses CSX's Marley Neck Branch railroad line and expands to a divided highway. The state highway, now named Pennington Avenue, passes under I-695 and then over Curtis Creek on a drawbridge. The state highway meets MD 710 (Ordnance Road) before reducing to an undivided highway and crossing Cabin Branch on twin bridges. MD 173 intersects CSX's Marley Neck Branch rail line at-grade and enters the neighborhood of Curtis Bay. The northbound direction of MD 173 makes a pair of right-angle turns, east onto Birch Street and then north onto Curtis Avenue; the southbound direction uses Pennington Avenue through the neighborhood. Curtis Avenue divides the residential and industrial portions of the neighborhood. MD 173 meets MD 171 (Church Street) within Curtis Bay. At the northern end of the neighborhood, the one-way pair ends and MD 173 turns west onto Patapsco Avenue to pass through Brooklyn as a four-lane undivided street. The westbound highway has an entrance ramp to I-895 (Harbor Tunnel Thruway) immediately before reaching its northern terminus at MD 2 (Potee Street). Patapsco Avenue continues as a municipal highway across the Patapsco River toward Southwest Baltimore.