Saint John River Facts

French explorer Samuel de Champlain named the river after sailing into its mouth on the Nativity of St. John the Baptist day in 1604.

Saint John River
The course of the St. John River
Origin	Northwestern Maine
Mouth	Bay of Fundy at Saint John, NB
Basin countries	Canada, United States
Length	673 km (418 mi)
Source elevation	360 m (1,181 ft)
Avg. discharge	990 m³/s (35,000 ft³/s)
Basin area	54,986 km² (21,230 mi²)

The Saint John River totals 410 miles in length with 210 of those miles in Maine.

The river has a drainage area that includes 21,230 square miles, 7,360 of which is in Maine.

Discharge at Mouth: 25.5 billion gallons/day on average.

The Saint John River is one of the largest river basins on the East Coast. The St. John drains over 21,000 square miles of land. Maine's portion of the Saint John totals 210 miles in length. Its upper portions are some of the most remote stretches of river in all New England.