Water Flow
- See also 2008 Saint John River Flood
The United States Geological Survey maintains three gauges on the river to measure water flow on the portion running through its territory. The furthest upstream gauge is located in an unnamed township at (46°42′00″N 69°42′59″W / 46.7°N 69.71639°W / 46.7; -69.71639 (St. John River gauging station)) where the rivershed is 1,341 square miles (3,470 km2). A second gauge is located at Dickey, Maine (47°06′44″N 69°05′25″W / 47.11222°N 69.09028°W / 47.11222; -69.09028 (Dickey, Maine gauging station)) where the rivershed is 2,680 square miles (6,900 km2). The third gauge is maintained in cooperation with the Water Survey of Canada on the Canadian bank in Clair, New Brunswick at (47°15′35″N 68°35′45″W / 47.25972°N 68.59583°W / 47.25972; -68.59583 (Clair, New Brunswick gauging station)) where the rivershed is 5,665 square miles (14,670 km2).
WSC also maintains its own gauges on the river in New Brunswick at Edmundston, Grand Falls, Fredericton, Maugerville, Upper Gagetown, Gagetown, Oak Point, and Saint John.
At the most upstream gauge the riverflow has ranged from 44,400 cubic feet per second (1,260 m3/s) to 59 cubic feet per second (1.7 m3/s). At the Dickey gauge flow has ranged from 91,700 cubic feet per second (2,600 m3/s) to 129 cubic feet per second (3.7 m3/s). At the Clair gauge flow has ranged from 151,000 cubic feet per second (4,300 m3/s) to 510 cubic feet per second (14 m3/s). Water flow is highest during the spring freshet and lowest in the fall. In early spring, upper sections of the river can experience ice jams causing flooding, while in the lower sections in the broader floodplain, flooding may occur during late spring from the sheer volume of water which must make its way through the narrow gorge at the Reversing Falls.
Read more about this topic: Saint John River (Bay Of Fundy)
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