-
Oklahoma designates the Illinois River a scenic water way under the 1968 Wild and Scenic Rivers Act.
-
U.S. government passes the Clean Water Act
-
Environmental Protection Agency permits Fayetteville,Arkansas, to dump treated waste water into a tributary of the Illinois River: Oklahoma Sues.
-
U.S. Supreme Court rules Arkansas may dump treated sewage into the Illinois River watershed, but that it must meet Oklahoma water quality standards.
-
Oklahoma begins gathering data on phosphorous and other pollutants in the Illinois River.
-
state of Oklahoma issues report detailing high levels of contaminates in Lake Tenkiller
-
Arkansas and Oklahoma agree to work together to reduce pollution in the Illinois River watershed.
-
Poultry companies submit plan to reduce chicken littler application in Oklahoma river watershed. Oklahoma Attorney General Drew Edmondson call plan "lacking"
-
Edmondson files a federal lawsuit against 14 poultry compainies, accusing them of polluting the Illinois River watershed with chicken litter.
-
Citing data obtained through water and soil samples, state seeks preliminary injunction banning the use of poultry litter in the Illinois River watershed.
-
Judge rejects state's request for a preliminary injunction to prevent the land application of poultry waste.
-
Poultry industry seeks to have case dismissed because Cherokee Nation has water rights in the watershed.
-
Federal trail begins in Judge Gregory Frizzell's courtroom.
-
Judges rules that state can't seek millions in damages because it failed to property include the Cherokee Nation, which claims water in the watershed.
-
Final arguments in chicken poultry case. After more then five years, no decision has been rendered.
-
Federal trial begins in Judge Gregory Frizzell's courtroom.
-
Oklahoma and Arkansas announce joint three-year study of water quality in the Illinois River watershed.
-
Environmental protection agency makes available for comment a proposed illinois river watershed modeling program.(J.K.)