Interstate 170 (Maryland)

Interstate 170 (Maryland) was a short, unsigned auxiliary Interstate in Baltimore constructed as a freeway stub and urban connector. Built during the era of 20th‑century urban highway expansion associated with projects like I‑95 and the Jones Falls Expressway, the roadway served as a truncated segment intended to link northern Baltimore neighborhoods to a larger network anchored by I‑70 and I‑83. Controversy over displacement, costs, and planning led to cancellation of its planned extensions, leaving the surviving segment integrated into local routes and right‑of‑way visible in aerial imagery and city fabric.

Route description

The route began near the junction with U.S. 40, intersecting urban arterials such as Pulaski Highway and proceeding northward adjacent to corridors like Pennsylvania Avenue, Mulberry Street, and traces of the Charles Street grid. It ran in a depressed roadway trench paralleling rail rights‑of‑way shared historically with lines of the Pennsylvania Railroad and later Amtrak and Conrail, passing close to landmarks including Lexington Market, Oriole Park at Camden Yards, and the Baltimore Convention Center. The freeway provided ramps connecting to I‑95 and local collectors that served neighborhoods such as Upton, Druid Hill Park, and the Mount Vernon area, and terminated near surface routes like MD 140 and Greenmount Avenue.

History

Planning for the corridor dates to interstate expansion initiatives contemporaneous with projects like I‑70 and the nationwide Interstate Highway System, influenced by urban renewal programs tied to agencies such as the Federal Highway Administration and local bodies including the Maryland State Highway Administration and the Baltimore City Department of Transportation. Early proposals aligned the spur with broader beltway concepts championed by figures and reports associated with postwar infrastructure, echoing debates seen in Robert Moses‑era controversies and public hearings involving advocacy groups like Environmental Defense Fund and neighborhood organizations in Baltimore City. Construction began in the 1970s after right‑of‑way clearance similar to other contentious projects such as the Cross Bronx Expressway, resulting in displacement in communities near Pennsylvania Avenue and sparking legal and political responses from elected officials including representatives from Maryland's congressional delegation and the Baltimore City Council. The roadway opened in the late 1970s as an unsigned Interstate segment and was administratively removed from the signed network during the late 1980s as plans changed and priorities shifted under leadership of state governors and transportation secretaries.

Planned extensions and cancellations

Original designs envisioned an extended auxiliary connecting to I‑70 across the northwest corridor of Baltimore County with alignments passing near institutions like Morgan State University, commercial nodes such as Reisterstown Road Plaza, and neighborhoods proximate to Pimlico Race Course. Extensions mirrored proposals for other urban connectors like the canceled I‑70 Route through Baltimore and faced opposition similar to that which halted segments of Inner Loop (Highway) projects in other cities. Political interventions from municipal leaders, litigation inspired by community groups, and funding reallocation influenced decisions; federal policy shifts following environmental legislation such as actions contemporaneous with amendments to programs overseen by the Environmental Protection Agency and congressional committees led to formal cancellation. Portions of the planned right‑of‑way were repurposed for local arterials, public transit corridors explored with agencies like Maryland Transit Administration, and redevelopment projects tied to initiatives from the National Trust for Historic Preservation and city planning commissions.

Exit list

The short freeway featured a minimal set of ramps and interchanges serving major urban corridors; signage changes over time reflected connections to routes including U.S. 40, I‑95, and MD 140. Primary access points served destinations such as Lexington Market, Baltimore Penn Station, and the Inner Harbor, while secondary ramps connected to local streets like Mulberry Street and Charles Street. Because the facility was unsigned and later truncated, contemporary exit numbering is primarily preserved in planning documents of the Maryland Department of Transportation and historical maps produced by publishers like Rand McNally and the United States Geological Survey.

Impact and legacy

The incomplete spur became emblematic of mid‑century urban freeway controversies, cited in studies by academic institutions such as Johns Hopkins University and urbanists influenced by works like those of Jane Jacobs and Kevin Lynch. Physical remnants influenced redevelopment patterns near Mount Vernon and Druid Hill Park, informing projects funded by entities including the Maryland Department of Housing and Community Development and private developers behind mixed‑use conversions near Camden Yards. Policy lessons from its cancellation affected later transportation planning in Maryland, contributing to emphasis on transit investments by the Maryland Transit Administration and influencing federal‑state dialogue in committees convened by the United States Department of Transportation and legislative delegations. The corridor is studied in urban planning curricula at universities like University of Maryland, Baltimore County and cited in municipal preservation efforts registered with the National Register of Historic Places and local historic trusts.

Category:Transportation in Baltimore Category:Former Interstate Highways