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Overnight bridge maintenance work will affect some major roadways in Amherst, beginning early next week, the state Department of Transportation announced Thursday.

Beginning Monday, the southbound ramp from the Lockport Expressway/I-990 to the eastbound Youngmann Memorial Highway/I-290 will be closed between 8 p.m. and 6 a.m. Detours will be posted.

In addition, the eastbound Youngmann will be reduced to two lanes near Exit 4/I-990.

From about 10 p.m. Wednesday until 6 a.m. Thursday, the Millersport Highway/Route 263 ramp to the westbound Youngmann will be closed; a detour will be posted. Westbound traffic in the area of Exit 5/Route 263 will be reduced to two lanes.

In both cases, the work is weather-sensitive and could be delayed.