Alewives have returned to the Sebasticook River in Benton, Maine, following efforts to remove dams that previously blocked their path [1].

The return of these migratory fish marks a significant ecological recovery for the region. By restoring natural river flow, the project has enabled the fish to migrate and reproduce, reversing the effects of decades of damming and overfishing [1].

Residents of Benton celebrate the recovery through an annual Alewife Festival held during a mid-May weekend [1]. The event coincides with the period when the alewives have returned for their annual migration [1]. This seasonal event has become a community staple as the population rebounds.

Environmental efforts to clear the waterway have led to a visible increase in fish numbers. Local observers said that historic harvests are growing [1]. The restoration of the Sebasticook River serves as a case study in how removing man-made barriers can rapidly restore aquatic biodiversity.

The project addresses long-term damage caused by infrastructure that severed the connection between the ocean and inland spawning grounds. With the barriers gone, the alewives can now complete their life cycle without human interference [1].

“the alewives have returned for their annual migration”

The recovery of the alewife population in the Sebasticook River demonstrates the immediate impact of dam removal on migratory species. By eliminating physical obstructions, the project has restored a critical biological corridor, suggesting that similar infrastructure removals in other river systems could trigger rapid population rebounds for endangered or depleted fish species.