With little income generated by the canals themselves — recreational revenue is about $165,000 a year, commercial only $40,000 — the cost of operating them is now covered largely with highway tolls collected by the Thruway Authority. And the roughly $55 million operating budget for the canals accounted for a large chunk of the $78.5 million in losses the authority reported during the 2014 fiscal year. On top of that are annual capital investments in the tens of millions of dollars to maintain and improve the system. The burden falls largely on highway toll-payers because of a decision in 1992...