DULUTH - The northbound lanes of Interstate 535 at the Blatnik Bridge will closeMonday, May 14 and will remain closed until mid-summer. The Highway 2 BongBridge may be used as an alternate northbound river crossing.TheI-535 southbound lanes will remain open; however, motorists may encounterbrief, single-lane closures.Thelane closures are necessary as work begins on a two-year preservation projectdesigned to extend the life of the bridge.Motoristsare asked to drive with caution and at posted speeds as crews work in thenarrow confines of the closed lanes.Formore information on the project, visit www.dot.state.mn.us/d1/projects/blatnikbridge/.For updatedtravel information on all Minnesota roads, call 511 or click on www.511mn.org.