GDOT concepts show that primary changes could impact how commuters access the new crossing from downtown Savannah.

A tidal estuary, the Hudson River is a mix of salt water and fresh water runoff.

The goal is to upgrade the massive system that sends water to 27 million people, mostly in Southern California, and vast sprawls of farmland.

The package includes trackway, a retaining wall, bridges and viaduct leading from the current Northeast Corridor to the ...