The St. Regis Paper Company or its successors shall be required from the 15th day of April to the first day of December of each year, at their own expense, to keep the fishways at the lower and upper dams of the Eastern River in repair and in such order at all times so that the passage of said fish into, or out of, Lake Alamoosook, so called, will not be hindered.
13- 188 C.M.R. ch. 30, § 04