Boston got a white Christmas with more snow than was expected, more 4-6 inches than the expected <1 inch. I was out of town and missed it, but had a snow-plowing service get my sidewalk. By Thursday morning, when I drove and biked out for the first time, the snow was compacted into only a couple of inches and the roads were clear, but the sidewalks and bike paths often were not.

Please send updates and reports on the conditions of other paths in Massachusetts to Jessica Mink.

Arnold Arboretum 1.5 miles of park roads which are mostly closed to automobile traffic with no intersections Boston Parks and Harvard University	Not checked yet.
Blackwell Footpath A half-mile gravel path connecting the Forest Hills MBTA station and the South St. Arboretum entrance Boston Parks and Harvard University	It didn't look plowed when I biked by on Washington St. and can be pretty icy.
Roslindale Bike Lanes Two miles of bike lanes on both sides of Washington St. from Forest Hills to Roslindale Square and to West Roxbury on Belgrade Ave. and buffered and wide bike lanes along American Legion Highway Boston Public Works Department	They need repainting pretty badly in a lot of places. I haven't biked them yet, but I suspect that parked cars block at least part of the lane.
Centre St. and VFW Parkway Bike Lanes DCR, plowed by MassDOT	Not checked but probably partly clear.
Arborway Bike Lanes Bike lanes through Forest Hills Department of Conservation and Recreation	The two-way cycle track which is complete along the Arborway west from South St. was still totally unplowed on Thursday morning, but the sidewalk was clear.
Arborway sidewalks 1 mile of wide paved shoulder which is unmarked but usually clear of parked cars during rush hour Department of Conservation and Recreation and Boston Parks	Not checked yet.
Morton St. Buffered Bike Lanes Cemetery Rd. to Harvard St. MassDOT	I drove my car along them this morning, and they looked about 3/4 clear.
Franklin Park Roads Much of the park loop road is closed to motorized traffic and there are bike lanes on the main road. Boston Parks and Public Works Departments	Not checked yet.
Centre/South Bike Lanes A mile of bike lanes through the heart of Jamaica Plain from Jackson Square and the Southwest Corridor to Forest Hills Boston Public Works Department	Partly blocked by parked cars but mostly clear.
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	Lots of ice and hard-packed snow, but in most places there is a path on dry sidewalk. Not everywhere, though, so watch out! The refrozed melted snow surface kept there from being too much drifting snow in the path.
Prince St. A future contraflow lane around high-speed Parkman Drive which feeds into the Perkin St. bike lanes Boston DPW	Not checked yet, but probably very clear.
Perkins St. Bike Lanes 1.5 miles of mostly bike/ped-separated paths paralleling a busy 4-lane parkway; two intersections with traffic lights Department of Conservation and Recreation	Not checked yet.
Olmsted Park Paths 3/4-mile of mostly bike/ped-separated paths built over Riverdale Road, across Leverett Pond from the Jamaicaway. Brookline Park Department	Plowed, but icy.
Brookline Ave. Path Mixed-use path from Riverway ramp to Riverway intersection Brookline Park Department	Mostly clear pavement by Thursday morning.
Parkway and Netherlands Rd. Contraflow bike lanes Two one-block contra-flow lanes plus and contraflow cycle track Brookline Park Department and DPW	The bike lanes were pretty clear, but the cycle track remained totally unplowed.
Muddy River Path 12-foot-wide 0.6 mile shared bike/ped path with no intersections Brookline Park Department and DPW	Very icy, but with 40 years of ice biking experience, I biked it without studded tires. The surface is a mixture of white and black ice, and not safe on Thursday morning.
Brookline Ave. Bike Lanes From Longwood Ave. to Park Drive Boston Transportation Department	Not checked yet.
Boston Bike Lanes Boston Transportation Department	Commonwealth Ave. Bike Lanes Fairly clear, at least around the B.U. Bridge. N. Harvard St. bike lanes Not checked yet. Harvard Ave. bike lanes Not checked yet.
Brookline Bike Lanes Town of Brookline	Not checked yet
B. U. Bridge Bike Lanes Boston to Cambridge Department of Conservation and Recreation, Plowed By MassDoT	Three-fourths clear; very usable on Thursday morning.
B. U. Bridge west sidewalk Boston to Cambridge Department of Conservation and Recreation, Plowed By Mass. Highway Department or B.U.	Totally clear by Thursday morning
Harvard (Mass. Ave.) Bridge bike lanes Cambridge to Boston Department of Conservation and Recreation, Plowed By Mass. Highway Department	Not checked yet.
Longfellow Bridge bike lane Cambridge to Boston Department of Conservation and Recreation, Plowed By Mass. Highway Department
Charles River Bikepaths Narrow, shared bike-ped path with few intersections Department of Conservation and Recreation	The Cambridge side upstream from the BU Bridge looked pretty snowy on Thursday morning, so I rode to work on Cambridge bike lanes and cycle tracks instead.
J.F.K. Park Wide, shared bike-ped path from river to Harvard Square Department of Conservation and Recreation	Should be bare, but I haven't ridden it.
Western Ave. Cycletrack Cambridge Cambridge DPW	Clear, dry pavement by Thursday morning.
Lincoln St. to Cambridge St. MassPike Bridge Bike/Ped connection from Harvard Square to Allston's Harvard Ave. district via Franklin St. Massachusetts Turnpike Authority	Not checked yet, but probably clear
Southwest Corridor Bikepath Separated Bike/Ped path with poorly-designed intersections Department of Conservation and Recreation	Not checked yet
South Bay Harbor Trail Bike/Ped path from the Federal Court House up Fort Point Channel to the Southwest Corridor City of Boston	Not checked yet.
Neponset Trail Mostly paved Bike/Ped path Department of Conservation and Recreation	Lee Toma reports on December 28: While the DCR plowed the east and south ends of the Neponset Greenway on Monday afternoon, they didn't do from Mattapan Square to Granite Ave until Wednesday after Vivian chided them about it. So the middle section is now plowed well enough that there is smooth, hard packed snow, which is a big improvement. And Lauren Maloney reports that they recently plowed the trail at Tenean Beach down to the pavement.
Beacon St. Cycle Track Parking-separated path from Park St. to Oxford St. City of Somerville	No report yet.
Somerville Community Path Wide rail trail from Davis Square to Cedar St. City of Somerville	Not checked yet
Mystic River Paths A variety of paths in East Somerville and Malden Mostly DCR	Not checked yet.
Red Line Linear Park Path Alewife MBTA station to Davis Square over Red Line City of Cambridge City of Somerville	Not checked yet
Danehy Park Paths City of Cambridge	Not checked yet, but probably fairly clear.
Cambridge Bike Lanes Striped lanes of varying widths on major and connecting streets City of Cambridge	Brookline St. bike lane clear on Thursday morning
Vassar St. Cycle Track Buffered bike lanes from Main St. to Memorial Drive (almost) City of Cambridge	Not checked yet.
Brattle St. Cycle Track Parking-buffered bike lanes between Brattle Square and Mason St. City of Cambridge	Clear on Thursday morning.
Mass. Ave. Cycle Track Parking-buffered bike lanes outbound before and after Harvard Square City of Cambridge	Clear on Thursday morning between Mt. Auburn St. and Harvard St. Law School cycle track not checked. This is definitely an improvement on the bike lanes which used to be here and were often blocked by cars parked out from the curb after a snowstorm.
Green St./Franklin St. Bicycle Boulevard Narrow one-way streets parallel to Mass. Ave. from Central Square to Harvard Square/I> City of Cambridge	Not checked yet.
Fresh Pond Bike Path Parallel to Fresh Pond Parkway in Kingsley Park City of Cambridge	Not checked yet.
Alewife Brook Trail DCR	Boardwalk sections aren't plowed. No report on the rest.
Fitchburg Cutoff Trail DCR	Not checked yet.
Concord Ave. Cycle Track Buffered bike lanes from Belmont to Fresh Pond Parkway City of Cambridge	David Merfeld reported Tuesday morning that it was clear.
Alewife Parkway Bridge Sidewalk Connection from Minuteman Bikepath to Fresh Pond and beyond Department of Conservation and Recreation	Not checked yet.
Minuteman "Commuter Bikeway" Towns of Cambridge, Arlington, Lexington, and Bedford	Brian Ristuccia reports on December 28: The Minuteman Bikeway was plowed through Arlington with some residual snow and icy in spots. Lexington is plowed but has substantial ice - the section from Lexington center to the Arlington line would be impassible without serious studded tires. He made a YouTube video of the trail across Arlington and put it here.
Watertown Bike Path Town of Watertown	Not checked yet.
Upper Charles Reservation Watertown, Newton, Waltham 4+ miles of paved and unpaved bikepaths Mass. Department of Conservation and Recreation	Not checked yet
Newton Bike Lanes City of Newton	Not checked yet.
Medford Bike Lanes Town of Medford	Not checked yet.
Revere Beach Reservation Revere Shared use paths (or very wide sidewalks) Mass. Department of Conservation and Recreation	Not checked yet.
Northern Strand Community Trail Everett and Malden Shared use path Everett and Malden DPW	Not checked yet.
Stony Brook Reservation Hyde Park 4+ miles of paved bikepaths Mass. Department of Conservation and Recreation	These paths aren't plowed because they get relatively little transportation use and because they are used by cross-country skiers like me. There are marked narrow bike lanes on Enneking Parkway through the reservation which are probably clear. After this snowfall, the paths should be pretty bikable, though there will be ice.
Former Metropolitan State Hospital Belmont, Waltham paved bikepaths Mass. Department of Conservation and Recreation	Not checked yet.
Assabet River Rail Trail Hudson and Marlborough, so far Town of Hudson, City of Marlborough (so far)	Not checked yet.
Northampton Bikeway East-west across the City of Northampton City of Northampton	Craig Della Penna, who lives next to the path, has reported that it is the intention of the DPW to make it passable ASAP after a storm. If the storm is significant, then they plow it repeatedly --sometimes 10-12 times during the course of the storm to ensure its usability.
Norwottuck Rail Trail Northampton to Amherst Department of Conservation and Recreation	No report.