Number one endangered river in Canada:

The Petitcodiac River, southeastern New Brunswick, Canada. The problem with the Petitcodiac dates back to 1968, when a causeway was erected across the river. Its channel, originally 1.6 kilometres (1 mile) wide, has since shrunk to 80 meters (263 feet), and its unique tidal bore, originally one to two meters (four to five feet) in height, is now little more than a frail ripple. Because of the impediment to the waters flow, massive amounts of silt have been deposited downstream from the causeway and have caused the channel to close. The photos above show the Petitcodiac (bottom) prior to the impediment, and (top) following the impediment.

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