upgrade-stream side of the beaver dam

agitated autumn back backwater balance beaver beavers beavertype branch branches bridges broken budget bulls canal causeway centennial cofferdam dam dammed dike engineering forest head headrace hydraulic hydrologic hydrological hydrology irrigation late levee level live naturalization nibbled park pond race rains raised reaches river side stalled stream structure structures stubby timber tree upgradestream upper upstream water waterside waterworks weir wildlife wood woodland works