# Lake Erie Basin

Lake Erie Basin consists of Lake Erie and surrounding watersheds, which are typically named after the river, creek, or stream that provides drainage into the lake. The watersheds are located in the states of Indiana, Michigan, New York, Ohio, and Pennsylvania in the United States, and in the province of Ontario in Canada. The basin is part of the Great Lakes Basin and Saint Lawrence River Watershed, which feeds into the Atlantic Ocean. 80% of the lake's water flows in from the Detroit River, with only 9% coming from all of the remaining watersheds combined. (The remainder (11%) is derived from direct precipitation into the lake.) A littoral zone serves as the interface between land and lake, being that portion of the basin where the lake is less than 15 feet (4.6 m) in depth.

## History

The Lake Erie Basin was formed at the end of the Wisconsin glaciation. The basin was part of Glacial Lake Maumee until an eastern drainage opened at Niagara, at which point the Maumee River Watershed reversed its flow eastward. The Great Black Swamp is thought to be a remnant of the glacial lake.

## Geography
### Indiana

* Maumee Watershed (Adams, Allen, DeKalb, Noble, Steuben, and Wells counties) (see Ohio)
** Maumee River
** St. Joseph River
*** Cedar Creek (Indiana)
** St. Mary's River

### Michigan

Michigan's drainage basin consists of 5,808 square miles (15,040 km$^2$).
* Belle Watershed (Lapeer, Macomb, Oakland, and St. Clair counties)
** Belle River
* Black Watershed
** Black River
* Clinton Watershed (Lapeer, Macomb, Oakland, and St. Clair counties)
** Clinton River
* Detroit Watershed (see also Ontario)
** Detroit River
** Ecorse River
** River Rouge
* Huron Watershed (Livingston, Monroe, Oakland, Washtenaw, and Wayne counties)
** Huron River
** Portage River
* Pine Watershed
** Pine River
* Raisin Watershed
** River Raisin
* Maumee Watershed (see Ohio)
** Tiffin River becomes Bean Creek in northern Ohio and Michigan

### New York

New York's drainage basin covers 2,300 square miles (6,000 km$^2$).
* Buffalo River Watershed (Erie, Genesse, and Wyoming counties)
** Buffalo Creek, Little Buffalo Creek, and Buffalo River
** Cayuga Creek
** Cazenovia Creek
** Hunter Creek
* Cattaraugus Creek Watershed (Cattaraugus, Chautauqua, Erie, and Wyoming counties)
** Cattaraugus Creek
* Chautauqua Creek - Lake Erie Watershed (Chautauqua County) (see also Pennsylvania)
** Beaver Creek
** Chautauqua Creek
** Crooked Brook
** Hyde Creek
** Scott Creek
** Silver Creek
** Twentymile Creek
** Walnut Creek

### Ohio

* Ashtabula-Chagrin Watershed (Ashtabula, Cuyahoga, Geauga, Lake, and Portage counties) (see also Pennsylvania)
** Ashtabula River
** Chagrin River
* Auglaize Watershed (Allen, Auglaize, Defiance, Mercer, Paulding, Putnam, and Van Wert counties)
** Auglaize River
** Ottawa River
* Black-Rocky Watershed (Ashland, Cuyahoga, Huron, Lorain, and Medina counties)
** Black River
** Rocky River
* Blanchard Watershed (Allen, Hancock, Hardin, Putnam, and Wyandot counties)
** Blanchard River
* Cedar-Portage Watershed (Hancock, Lucas, Ottawa, Sandusky, and Wood counties)
** Cedar Creek
** Crane Creek
** Packer Creek
** Portage River
** Rusha Creek
** Toussaint River
** Turtle Creek
* Chautauqua-Conneaut Watershed (Ashtabula County) (see also Pennsylvania)
** Conneaut Creek
* Cuyahoga Watershed (Cuyahoga, Geauga, Portage, and Summit counties)
** Cuyahoga River
* Grand Watershed (Ashtabula, Geauga, Lake, Portage, and Trumbull counties)
** Grand River
* Huron-Vermilion Watershed (Ashland, Crawford, Erie, Huron, Lorain, Richland, and Seneca counties)
** Huron River
** Vermilion River
* Maumee Watershed (Defiance, Fulton, Hancock, Henry, Lucas, Putnam, Williams, and Wood counties) (see Michigan)
** Bad Creek
** Beaver Creek
** Brush Creek
** Maumee River
** Swan Creek
** Tenmile Creek
** Tiffin River becomes Bean Creek in northern Ohio and Michigan
** Turkeyfoot Creek
* Ottawa-Stony Watershed (Fulton and Lucas counties) (see also Michigan)
** Ottawa River
* Sandusky Watershed (Crawford, Erie, Hardin, Huron, Marion, Ottawa, Richland, Sandusky, Seneca, and Wyandot counties)
** Sandusky River

### Pennsylvania

* Ashtabula-Chagrin Watershed (Erie County) (see also Ohio)
** Ashtabula River
* Chautauqua-Conneaut Watershed (Crawford and Erie counties) (see also Ohio)
** Conneaut Creek
** Turkey Creek
* Lake Erie Watershed (Crawford and Erie counties)

### Ontario

* Detroit River Watershed (see also Michigan)
** Avon River
** Detroit River
** Lake St. Clair
** St. Clair River
** Sydenham River
** Thames River
* Big Otter Creek
** Little Otter Creek
** South Otter Creek
* Clear Creek
* Long Point Creek
* Big Creek
** Venison Creek
* Dedrick Creek
* Fisherville Creek
* Hay Creek
* Lynn River Watershed
** Lynn River
* Nanticoke Creek
* Sandusk Creek
* Grand River Watershed is the largest drainage in southern Ontario at 2,600 sq mi (7,000 km²)
** Grand River
*** Conestogo River
*** Eramosa River
*** Nith River
*** Speed River
* Nanticoke Creek (Ontario)
* Big Creek
* Big Otter Creek

## Economy

Agricultural, industrial, and residential land use are the primary nonpoint sources of pollution in the Lake Erie Basin. National and state environmental agencies, as well as interstate and binational cooperative efforts, focus on water quality, especially since the freshwater lake is used extensively for drinking water, recreation, and the fishing industry. Habitat and flow alteration cause siltation and sedimentation issues which can require dredging. Fertilizer runoff from farms and residences and unplanned releases from sewage treatment plants promote eutrophication through nutrient and organic enrichment, bacterial contamination, and the appearance of ammonium hydroxide. Industrial land use adds metals that flow into the basin and cause sediment contamination.