By 1910, complaints were being made about the canal's water being almost solid waste, which provoked the installation of a flushing tunnel that was across. The Butler Street Pumping Station, a Beaux-Arts structure at the canal's inland end, opened on June 21, 1911. The new flushing tunnel connected to the Pumping Station. At first, the brick-lined tunnel supplied clean water from the Buttermilk Channel between Brooklyn and Governors Island, carried it eastward underneath Butler Street, and discharged the clean water at the mouth of the Gowanus Canal. The flushing tunnel also failed, and aside from numerous operational glitches, a long series of errors and mistakes occurred throughout the 1960s. This culminated in an incident when a city worker dropped a manhole cover, severely damaging the pump system, which was already suffering from the effects of the corrosive salt water. The Clean Water Act of 1972 had not yet been passed, and the city, stretched for funds at the time, did nothing to address the issue. As a result of the unrepaired damage to the flushing tunnel, and the long stretch of economic recession, the waters of the canal lay stagnant and under-used for years.