Route History for US 1 in Washington, DC

• In 1928, US 1 entered Washington via Bladensburg Road, and then followed Maryland Avenue to the Potomac River.
• By 1964, US 1 was rerouted so it entered Washington via Rhode Island Avenue. From there it went to 6th Street, Constitution Avenue, 15th Street, and across the George Mason Memorial Bridge.
• In 1977, US 1 was rerouted so that from 6th Street, it turned onto L Street, then onto 9th Street to the Southwest Freeway (I 395).

Key to Abbreviations for Route Numbers:

• US - US Highway
• I - Interstate Highway (Eisenhower Interstate System)

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