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1970 (JG)
Oklahoma designates the Illinois River a scenic water way under the 1968 Wild and Scenic Rivers Act. -
1972 (JG)
U.S. government passes the Clean Water Act -
1988 (JG)
Environmental Protection Agency permits Fayetteville,Arkansas, to dump treated waste water into a tributary of the Illinois River: Oklahoma Sues. -
1992 (JG)
U.S. Supreme Court rules Arkansas may dump treated sewage into the Illinois River watershed, but that it must meet Oklahoma water quality standards. -
1993 (JM)
Oklahoma begins gathering data on phosphorous and other pollutants in the Illinois River. -
1996 (JM)
state of Oklahoma issues report detailing high levels of contaminates in Lake Tenkiller -
2003 (JM)
Arkansas and Oklahoma agree to work together to reduce pollution in the Illinois River watershed. -
September 2004 (JM)
Poultry companies submit plan to reduce chicken littler application in Oklahoma river watershed. Oklahoma Attorney General Drew Edmondson call plan "lacking" -
June 2005 (K.W.)
Edmondson files a federal lawsuit against 14 poultry compainies, accusing them of polluting the Illinois River watershed with chicken litter. -
November 2007 (K.W.)
Citing data obtained through water and soil samples, state seeks preliminary injunction banning the use of poultry litter in the Illinois River watershed. -
September 2008 (K.W.)
Judge rejects state's request for a preliminary injunction to prevent the land application of poultry waste. -
2008 (KW)
Poultry industry seeks to have case dismissed because Cherokee Nation has water rights in the watershed. -
2009 (M.A.)
Federal trail begins in Judge Gregory Frizzell's courtroom. -
2009 (M.A.)
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. -
2010 (M.A.)
Final arguments in chicken poultry case. After more then five years, no decision has been rendered. -
2009 (MA)
Federal trial begins in Judge Gregory Frizzell's courtroom. -
2013 (JK)
Oklahoma and Arkansas announce joint three-year study of water quality in the Illinois River watershed. -
oct. 1 2015 (JK
Environmental protection agency makes available for comment a proposed illinois river watershed modeling program.(J.K.)