According to the Maine DOT, I-295 will be reduced to 2 lanes (northbound) starting Tuesday, June 16th and extending until the end of August.
This diversion will be between Gardiner and Topsham. Any individuals headed southbound will have to take Route 201 or I-95.
Per Maine DOT, Bangor Daily News June 15, 2009, Section B, Page 8.
Personally, I'd avoid I-295 altogether.