Now the main worry is the health of the river.

ECONOMIST: So long as it doesn��t cost too much

The Susquehanna River Basin Commission said the overall health of the river basin is improving, but there are some problem areas.

WSJ: Susquehanna River commission wants gauge funding

The Vermont Department of Health said it has found radioactive tritium in the Connecticut River, which probably leaked from the nearby Vermont Yankee nuclear power plant.

FORBES: Radioactive Tritium Leaks from Nuke Plant; Also Two Million EXIT Signs

Polluted water increased health risks and harmed the ecology of the river, resulting in the deaths of large numbers of fish in "extreme cases", he told MPs.

BBC: Raw sewage in Thames 'a disgrace' - Labour MP

The Canals and River Trust (CRT) legally hold health and safety responsibility for the lock and part of the weir.

BBC: Aaron Burgess Saltford Weir death was accidental