&sq=&lang=&file=File:Alt_plate.svg){kind=small} &sq=&lang=&file=File:US_1.svg) U.S. Route 1 Alternate | |
|---|---|
 US 1 Alt. highlighted in red | |
| Route information | |
| Auxiliary route of US 1 | |
| Maintained by MDSHA and BCDOT | |
| Length | 3.92 mi[1][2] (6.31 km) |
| Existed | 1949–present |
| Major junctions | |
| South end |  US 1 in Arbutus |
| |
| North end | US 1 in Baltimore |
| Location | |
| Country | United States |
| State | Maryland |
| Counties | Baltimore, City of Baltimore |
| Highway system | |
U.S. Route 1 Alternate (US 1 Alt.) is an alternate route of US 1 in the U.S. state of Maryland. The highway runs 3.92 miles (6.31 km) between intersections with US 1 in Arbutus and in Baltimore. US 1 Alt. serves the southwestern Baltimore County community of Halethorpe and connects US 1 with full-access interchanges with Interstate 95 (I-95) and I-695. The Washington Boulevard portion of the alternate route was the original road southwest from Baltimore in the 18th century and was part of the turnpike southwest to Washington, D.C. for much of the 19th century. The highway was paved in the early 1910s, expanded in the late 1910s and late 1920s, and became part of US 1 in 1926. The Caton Avenue portion of the alternate route was improved and expanded in the 1930s to serve as a rerouting of US 1 in southwest Baltimore. US 1 Alt. was created in 1949 when US 1 was moved to its present course through Arbutus and southwest Baltimore. The alternate route's interchanges with I-695 and I-95 were constructed in the late 1950s and mid-1970s, respectively.