Known as Springs Road, the state highway runs 1.69 miles (2.72 km) from U.S. Route 40 Alternate (US 40 Alternate) in Grantsville north to the Pennsylvania state line, where the highway continues as Pennsylvania Route 669 (PA 669).

MD 669 begins at US 40 Alternate (Main Street) in Grantsville.

The state highway heads north as a two-lane undivided road, leaving the town limits of Grantsville and passing scattered residences and farmland.

[5][6] The Pennsylvania Department of Highways designated the adjacent portion of Springs Road part of PA 669 in 1963.

[7] The Maryland State Roads Commission renumbered MD 417 to match the Pennsylvania number the same year.