La Grosse Décharge Est is a tributary of the north shore of La Grosse Décharge Ouest, flowing entirely in the town of Baie-Saint-Paul, in the Charlevoix Regional County Municipality, in the administrative region of Capitale-Nationale, in the province of Quebec, in Canada.

This valley is mainly served by secondary forest roads which connect to the Chemin du Séminaire which runs along the south side of La Grosse Décharge Ouest.

The water level of the river varies with the seasons and the precipitation; the spring flood generally occurs in April.

The Big East Discharge originates at the mouth of a very small lake (length: a hundred meters; altitude: 673 metres (2,208 ft)).

The toponym "La Grosse Décharge Est" was formalized on March 25, 1997 at the Place Names Bank of the Commission de toponymie du Québec.