Lake Washington is the largest lake in Brevard County, Florida at 4,362 acres (17.65 km2).
It is the 41st largest lake in the state of Florida. It is approximately 4 by 1 mile (6.4 by 1.6 km) and 10 to 15 feet (3.0 to 4.6 m) deep.Located adjacent to the City of Melbourne, it is the single most important source of fresh water for the city and the surrounding areas. It furnishes two-thirds of the water to Melbourne\'s 150,000 customers.
It is one of the lakes that make up the St. Johns River system. Further downstream is the neighboring Lake Winder.
