Oregon Department of Transportation crews will be working on a pair of bridges in The Dalles area this week that have experienced pavement failures due to the winter weather conditions and increased traffic due to recent storms.  The Interstate 84 westbound bridge at milepost 90 is under a single lane closure through Tuesday or Wednesday as the asphalt concrete pavement surface has been delaminating and leaving deep potholes, so crews will remove all of the asphalt from the bridge, taper the approaches down to the concrete deck, and a new surface will be placed later this spring or summer.  There are similar conditions on The Dalles Bridge into Washington, and asphalt patching will begin Tuesday, with single lane closures during daytime hours leading to ten to 15 minute delays.  In all cases, ODOT asks motorists to slow down as they pass through work areas.