unsafe conditions on a Federal inland waterway system that prevent the operation of commercial vessels, resulting from a major change in water level or flows;

an obstruction in a Federal inland waterway system, including silt, sediment, rock formation, or a shallow channel;

an impaired or inoperable Federal lock and dam; or

any other condition determined appropriate by the Secretary.

be initiated by not later than 60 days after the date on which the Secretary makes the applicable determination under subsection (b); and

to the maximum extent practicable, be completed by not later than 1 year after the date on which the Secretary makes such determination.