More info from canal website:
June 29, 2006 -- Mariners are advised that Lock E-2 to E-26 on the Erie
Canal, Cayuga/Seneca Lock 1 and the entire Oswego and Champlain Canals are
closed due to high water levels and debris, until further notice.

Sometimes the canal can be closed 1-2 weeks until waters recede.
Lee Haefele
Ithaca, NY