CHESTERFIELD, Mo. (AP) — All lanes of traffic will be closed in both directions on Interstate 64 at the Daniel Boone Bridge in suburban St. Louis Monday, while crews demolish the old westbound span.

The Missouri Department of Transportation says eastbound and westbound lanes will close between Boone’s Crossing in St. Louis County and Highway K in St. Charles County starting at 9:45 a.m. MoDOT is blasting the remainder of the 1930s-era bridge. An explosion on Feb. 18 demolished part of the bridge.

MoDOT built a new eastbound bridge that opened in June. The former eastbound bridge was rehabbed for westbound traffic. The new bridge made the old, narrow one obsolete.

The bridges carry traffic across the Missouri River.