Spanning 6.1 miles (9.8 km), it serves as a north–south principal arterial road through eastern Ogden, connecting US-89 (Washington Boulevard), Weber State University, and SR-39 (12th Street).

[6] Harrison Boulevard north from SR-39 at Valley Drive to 2nd street was added in 1941 as Route 203, designated as continuing north on Harrison, past the Utah State Tuberculosis Sanatorium to 2nd Street, then west to the Army Supply Depot.

In 1953, the northern section of Harrison Boulevard was removed from SR-203, leaving that route entirely on 2nd Street.

[2][8] In 1964, SR-39 was realigned from Harrison and 24th to the new roadway constructed on 12th Street at the mouth of Ogden Canyon west to Washington Boulevard.

As a result, SR-203 now ran from the Army Depot east along 2nd Street to Harrison, then south to the end of Harrison at present-day US-89, while SR-39 ran straight up 12th Street, and SR-103 was deleted from the state highway system until the route number was reused the following year.