Designated-use support	Rivers and streams	Lakes, ponds, and reservoirs	Estuaries
	miles	acres	square miles
Fully supporting	386,161	7,787,615	14,586
Threatened	53,324	2,054,724	1,976
Impaired	201,558	4,357,127	7,358
Total surface waters surveyed	641,611	14,200,153	23,921
Total surface waters not surveyed	2,992,541	37,327,775	15,918
Total surface waters	3,634,152	41,654,902	39,839

Source: U.S. Environmental Protection Agency, Office of Water, National Water Quality Inventory: 1996 Report to Congress (EPA, OW, Washington, DC, 1998).

Last Updated on Tuesday, September 21, 1999