2015 large lock maintenance, Hiram M. Chittenden Locks, Seattle, Washington. Looking slightly west of south. A man stands at the top of a temporary wooden staircase that leads to an entrance to one of the two penstock tunnels by which water would normally enter and leave the lock. This is in between the normal lower (seaward) gate of the locks off camera at left (see Chittenden Locks during large lock maintenance 001.jpg) and a gate mitred in the opposite direction off camera at right (see Chittenden Locks during large lock maintenance 002.jpg), which provides the seal for pump-out.