From today's MBTA Transit Update page:
Lechmere Shuttle Change: Charles River Park bus stop will be closed intermittently until early October
Starting the morning of Tuesday, August 31st, and continuing until Sunday, September 5th, Lomasney Way and Martha Road will be closed at various times for the demolition of the elevated Green Line tracks. The Charles River Park stop on the Green Line Lechmere Shuttle will be closed, and the Museum stop will be moved around the corner to Land Boulevard. During this time, the Charles River Park stops will be closed and the Science Museum stop will move, but all other stops will be served in their existing locations. The Charles River Park stop will be closed and the Science Museum Stop will move at these times:
Tuesday, August 31 - 9:30AM - 7:00PM.
Wednesday Sept. 4 - Friday Sept.3 - 7:00AM - 7:00PM.
Saturday Sept. 4 – Sunday Sept. 5: All day
Monday Sept. 6 (Labor Day): Open all day
Tuesday Sept. 7 – Friday Sept 10: 9:30AM-3:30PM, and after 11pm
Saturday Sept. 11 – Sunday Sept 12: All day
Monday Sept. 13 – early October: After 11 PM
This schedule is tentative and subject to change. For more information call the MBTA at 617-222-3200 (TTY 222-5146).