Marsh River (Maine)

The Marsh River is a tidal river located in Sagadahoc County, Maine, USA. It empties into Merrymeeting Bay, a large freshwater tidal estuary where the Kennebec River, Androscoggin River, Cathance River, and Abagadasset River also converge.

The river's watershed is relatively small, primarily draining marshlands and forested areas. The Marsh River is known for its significant tidal influence and associated mud flats, which are important habitats for wading birds, shellfish, and other estuarine species. It provides valuable ecosystem services, including nutrient cycling and serving as a nursery for juvenile fish.

The river is navigable for small boats at high tide for a short distance. There are limited residential and commercial developments along its banks, maintaining its relatively undeveloped character. Conservation efforts focus on protecting the water quality and preserving the ecological integrity of the river and surrounding wetlands.