Pike River (French: Rivière aux Brochets) is a tributary of Lake Champlain (via Missisquoi Bay), flowing successively in: Besides the village areas, agriculture and forestry are the main economic activities in this valley.

More than 85% of its watershed, i.e. 670 square kilometres (260 sq mi), is thus located on the territory of the Brome-Missisquoi Regional County Municipality in the south of the Estrie.

When the new bridge opened on the American side between East Alburg and Lakewood, the old road on the dyke was partially demolished, which made it possible, during the spring breakup and during heavy rains, a certain flow of water to "Grand Lac Champlain" (25 nautical miles (46 km; 29 mi) - from there).

In September 2014, the UPA's media body "La Terre de chez nous" reported that blue-green algae was contaminating the Bedford water treatment plant.

It is likely to worsen as long as the flow remains slowed down by the railway rights-of-way or until it is evacuated artificially, for example by connecting the outlet of the McPhee stream (at the limit of Clarenceville and Venise-en-Quebec) with the South River further north, some 12 km (7.5 mi) away.