Various levels of spill, spill configuration and tailwater elevation
were tested at the John Day Dam in early July to determine the best level
to spill water for fish passage while complying with total dissolved gas
(TDG) limits.
The multi-agency Technical Management Team considered the spill test
at its June 30 meeting — implementation at the John Day Dam began the
following evening. TMT oversees in-season management changes in operations
of the Columbia River power system to facilitate
