2015 large lock maintenance, Hiram M. Chittenden Locks, Seattle, Washington. At left (only very partly visible here, but see Chittenden Locks during large lock maintenance 001.jpg) is what would normally be considered the lower (seaward) gate of the locks; this is a further gate, mitred in the opposite direction, which provides the seal for pump-out. One hard-hatted worker can be seen on the shallowly flooded floor of the lock chamber.