The Susquehanna, Potomac, Rappahannock, York and James rivers are the five largest rivers in the Chesapeake Bay watershed. More than 100,000 streams, creeks and rivers altogether, use this watershed to thread. From those rivers the bay gets about 51 billion gallons of water each day. The most amount of water enters the Chesapeake bay during spring, when the snow is melted and the bay receives the least amount if water during summer.