Definition
Sebago Lake is a natural freshwater lake situated primarily in Cumberland County in the southern part of the state of Maine, United States. It serves as a major source of municipal water for the city of Portland and its surrounding communities.
Overview
Sebago Lake lies approximately 20 mi (32 km) north of Portland and is the second‑largest lake wholly within Maine’s borders. The lake’s shoreline extends for roughly 85 mi (137 km) and the water body is bordered by the towns of Standish, Sebago, and the city of Portland. It is part of the Sebago Lake watershed, which drains into the Presumpscot River and ultimately reaches Casco Bay. The lake is a popular destination for boating, fishing, swimming, and other recreational activities, and it hosts several summer cottages and year‑round residences.
Etymology/Origin
The name “Sebago” is derived from the Abenaki language, a member of the Algonquian linguistic family historically spoken by Indigenous peoples of the region. According to documented place‑name studies, “Sebago” (or variations such as “Sébago”) is interpreted to mean “big water” or “large lake.” Precise translation is subject to scholarly variation, but the Indigenous origin of the name is well‑established.
Characteristics
- Surface area: Approximately 28,000 acres (≈ 113 km²).
- Mean depth: About 70 ft (21 m).
- Maximum depth: 264 ft (80 m), making it one of the deepest lakes in the state.
- Volume: Roughly 2.4 cubic miles (≈ 10 km³) of water.
- Elevation: 266 ft (81 m) above sea level.
- Water quality: The lake is classified as oligotrophic, characterized by low nutrient concentrations and high water clarity, which supports cold‑water fish species such as lake trout and land‑locked Atlantic salmon.
- Islands: Notable islands include Long Island, Bridle Island, and Island Pond Island.
- Management: The Sebago Lake Water Supply System, operated by the City of Portland Water Department, includes intake structures, treatment facilities, and a network of pipelines delivering water to the metropolitan area. Environmental stewardship is coordinated by the Sebago Lake Association and state agencies to preserve water quality and habitat.
Related Topics
- Presumpscot River: The primary outflow of Sebago Lake, connecting it to Casco Bay.
- Portland, Maine water supply: Municipal reliance on Sebago Lake as the principal source of drinking water.
- Maine lake classification: Oligotrophic lakes and their ecological significance.
- Abenaki language and place names: Indigenous linguistic contributions to New England toponymy.
- Recreational activities: Boating, fishing regulations, and tourism in the Sebago Lake region.
- Environmental organizations: Sebago Lake Association, Maine Department of Environmental Protection.