U.S. Route 1 in Maryland

U.S. Route 1 in Maryland
State	MD
Type	US
Length mi	81.86
Direction a	South
Terminus a	District of Columbia
Direction b	North
Terminus b	Delaware
Counties	Prince George's County, Anne Arundel County, Howard County, Baltimore County, Baltimore City

U.S. Route 1 in Maryland

U.S. Route 1 traverses central Maryland from the District of Columbia border to the Delaware line, linking suburban corridors, historic towns, and urban centers. The corridor connects nodes such as College Park, Beltsville, Elkridge, Ellicott City, Baltimore, and Wilmington via intersecting highways and transit facilities. As a historically layered alignment, the route intersects major transportation arteries and passes numerous cultural, institutional, and historic landmarks.

Route description

From the District of Columbia boundary near Rochambeau Drive and Rhode Island Avenue, the route proceeds northeast through Prince George's County adjacent to University of Maryland and National Museum of Natural History-proximate corridors. It intersects I-495 and I-95 near College Park Airport and connects to Baltimore–Washington Parkway before entering Howard County suburbs.

In Howard County the highway passes close to Howard County General Hospital, Patapsco Valley State Park, and the National Cryptologic Museum, joining and diverging from MD 32 and MD 100 interchanges. Approaching Baltimore County and Baltimore, the alignment becomes an arterial through Catonsville and Woodlawn, intersecting I-695 and US 40 near Fort McHenry. Through downtown Baltimore, the route follows surface streets with access to Penn Station, Camden Yards, and Inner Harbor attractions, then continues northeast through Towson before reaching the Maryland–Delaware state line near Wilmington.

Major interchanges link the route with I-70, Light RailLink crossings, MTA bus corridors, and park-and-ride facilities serving MARC and Amtrak. Roadway types vary from divided multilane boulevards to urban surface streets and grade-separated segments near Elkridge and Ellicott City.

History

The alignment follows early 19th-century turnpikes such as the Baltimore–Washington Parkway precursor routes and Washington and Baltimore Turnpike corridors used during the War of 1812 era and the Industrial Revolution expansion. The highway was designated as part of the original 1926 U.S. Numbered Highway System alongside U.S. Route 40, and its routing was influenced by 20th-century improvements associated with the Federal Aid Highway Act of 1921 and later Interstate Highway System planning.

Throughout the 20th century, segments were widened during the New Deal-era public works and modified to accommodate suburbanization driven by Pentagon-era commuting and Dulles area growth. The route saw major realignments concurrent with construction of I-95 and I-695, affecting communities such as Ellicott City, Catonsville, and Bel Air. Preservation and reconstruction efforts followed flood damage from storms including Hurricane Agnes and Tropical Storms that impacted the Patapsco River valley and prompted FEMA recovery projects. Recent decades brought intersection reconfigurations tied to MDSHA initiatives, BMC planning, transit-oriented development near College Park–University of Maryland station, and complete-street projects influenced by ADA standards.

Major intersections

Key junctions include interchanges with I-95 near Beltsville, I-495/I-95/I-495 connections, junctions with MD 32 at West Friendship, crossings of MD 100 near Ellicott City, an interchange with I-695 in Woodlawn, and downtown intersections with US 40 and MD 2 near waterfront districts. Other notable crossings are MD 176 near Odenton, MD 152 near Havre de Grace approaches, and the state line transition to US 13-connected corridors toward Wilmington.

Auxiliary routes

The corridor includes business and bypass variants such as older alignments through Bel Air, Ellicott City, and Baltimore that function as U.S. Route 1 Business spurs and state-maintained connectors. Short signed and unsigned state routes link to MD 198, MD 175, and MD 232 providing access to Fort Meade, Camp Springs, and Andrews Air Force Base. Local collectors and ramps near BWI Airport and National Harbor act as auxiliary connections facilitating commuter and freight movements.

Traffic and transportation planning

Traffic volumes on the route reflect commuter flows between the District of Columbia and Baltimore, with peak congestion near College Park and Towson. Planning agencies including the MDOT, MWCOG, BRTB, and FHWA coordinate projects to mitigate congestion via intersection upgrades, signal optimization, and multimodal enhancements. Freight planning links to the Port of Baltimore, regional rail yards, and interstate freight corridors including I-95 logistics lanes. Bicycle and pedestrian improvements connect to Anacostia Trail System, Baltimore Greenway Trails Network, and Patuxent Research Refuge corridors under federal and state grant programs.

Cultural and notable sites along the route

The route provides access to numerous cultural landmarks and institutions: University of Maryland, College Park, College Park Aviation Museum, National Air and Space Museum-affiliated collections, B&O Railroad Museum, Fort McHenry National Monument and Historic Shrine, Maryland Historical Society, and arts venues such as Baltimore Museum of Art and Peabody Institute. Historic districts along the corridor include Ellicott City Historic District, Mount Vernon, and Old Town Bel Air. Recreational and conservation areas adjacent to the highway include Patapsco Valley State Park, South River State Park, and waterfront spaces near Inner Harbor. Annual events with routing or access influenced by the highway include Preakness Stakes-related traffic to Pimlico, university commencement ceremonies at University of Maryland, and regional festivals in Towson and Baltimore.

Category:U.S. Highways in Maryland