The Chesapeake Bay is the largest estuary in the United States. The health of the Bay has been in decline for several decades. Excess nutrients flowing into the Bay from agriculture and developed land have caused the development of “dead zones”—areas of water depleted of oxygen where nothing can live. This watershed was once 95 percent wooded. Today, only about 55 percent of the watershed is forested, and that percentage continues to decrease by about 100 acres per day.