Juvenile Bypass Systems help fish avoid turbines

Juvenile bypass systems take advantage of existing dam structures to guide fish safely past dams. A long narrow slot above each turbine intake is known as a gatewell. This structure is only in use when a turbine is closed down for maintenance.

Scientists noticed that some juvenile fish swam up the gatewells rather than swimming through the turbines. At first, fish were manually collected from the gatewells and released downstream. Eventually, automatic systems were installed to carry fish from the gatewells into pipes to carry them safely through the dam.