beavers live under ice in winter, beaver dam

back backwater balance beauxite beaver beavertype beavers branch branches budget building built canal centennial dam dike dikeamer drain dykebrit engineering forest head headrace hydraulic hydro hydrologic hydrological hydrology ice irrigation levee level life live naturalization nibbled of off park pond raised rewildening river side stalled structure structures stubby technical timber tree under upstream water waterside waterworks weir wildlife winter wood woodland works