Minor repair work is being done on bridges along the Natchez Trace Parkway.

The repairs are under way from milepost 320 to 425 in Tennessee and Alabama.

Expansion joints in the bridge decks will be repaired, possibly causing single-lane closures.

According to a news release Tuesday from the National Park Service, work should be done by Aug. 1.

The 444-mile parkway runs from just south of Nashville to Natchez, Miss.