Foster Dam fish weir in operation
Water flows out of Foster Dam through a ‘fish weir’ (right spillway), Sweet Home, Ore. A fish weir is a structure that the Corps places in a dam’s spillway to manage water for juvenile fish passage. The weir constrains the release of water to maintain flow requirements, provides attraction for fish (stream-like flow from the surface of the reservoir) and creates a ‘cushion’ of water when striking the spillway. This cushion helps fish survive the fall. The Corps is removing a crane (upper right) to install a new weir.