A committee appointed by the Governors of Arkansas and Oklahoma studied the nutrient phosphorus and its contribution to degradation of water quality in the Illinois River watershed in Oklahoma. In December, 2016 the committee approved its final report which sustained Oklahoma's instream phosphorus limit for designated scenic rivers. That limit is 0.037 mg/L Total Phosphorus. It now is up to the two states to take the necessary steps to meet that limit at Oklahoma's border with Arkansas.
As of 2016, the phosphorus limit is being exceeded by 92-percent. For more data on water quality of Oklahoma Scenic Rivers, see: Report on Oklahoma Scenic Rivers Water Quality in the Articles section of our web page.