After a wet, heavy snow on Monday March 15 closed down schools and some places of employment around Boston (including mine), the paths were cleared fairly quickly. As I didn't bike until Wednesday, I can only project back on when the bikepaths of Boston, Brookline, and Cambridge were plowed. Please send updates and reports on the conditions of other paths in Massachusetts to Doug Mink dmink@cfa.harvard.edu.

Arnold Arboretum 1.5 miles of park roads which are mostly closed to automobile traffic with no intersections Boston Parks and Harvard University	I was skiing here before the snow stopped, and all of the roads were bare pavement, though wet. By Wednesday, they were dry.
Jamaicaway Bikepath 1.5 miles of mostly bike/ped-separated paths paralleling a busy 4-lane parkway; two intersections with traffic lights Boston Parks Deparment	This was plowed by the end of the day on Tuesday, but I don't know when.
Olmsted Park Paths 3/4-mile of mostly bike/ped-separated paths built over River Road, , across Leverett Pond from the Jamaicaway. Brookline Park Department	The bikepath was plowed by the end of the day on Tuesday, but I don't know when.
Muddy River Path 12-foot-wide 0.6 mile shared bike/ped path with no intersections Brookline Park Department and DPW	Plowed to pavement as usual.
B.U. Bridge	Sidewalk and pavement clear.
Charles River Bikepath Narrow, shared bike-ped path with few intersections Metropolitan District Commission	The Cambridge side was clear from B.U. Bridge to Hawthorne St.