Hikeable? Legal? Probably, but save your time for other treks. There are no bridges, just a weed-filled cut. Putts Hill Rd is now fill as is the Thruway overpass. A better spend of your time is the bike path on the WS RoW (technically a rail-trail?) down at Little Falls: serious rock cuts, rough ashlar retaining walls, Barge Canal Lock 17, Erie Canal Lock 36, potholes on Moss Island, good food on Anne St, old mill buildings and more, maybe even a view of a CSX or Amtrak over on the Chicago Main across the river.
BTW, Found this photo from the NYS Archives of the crushed stone works that is now a colonnade of pillars along the WS:
LF Stone Co. From Across Mohaw RIver.jpg
Here is the standard post card photo of the same.
LF Stone Co. Post Card.jpg
The WS ran between two structures, the main storage building whose pillars remain today, on the uphill side and another narrow building between the WS and the Erie Canal that was used for storing (bagged?) cement, a by product.
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