Illinois River and Kings River Study

Water Quality and Biological Assessment of Selected Segments in the Illinois River Basin and Kings River Basin, Arkansas.

This project characterized the water quality and  aquatic biological resources of several streams in the Illinois River basin and Kings River basin in northwest Arkansas to determine the status of  aquatic  life  use.  The primary water quality concern targeted in this project was the impact on in-stream biological communities and aquatic life use made by nutrient concentrations and dissolved oxygen.  Of particular interest were those waters upstream and downstream of wastewater treatment plants in the Cities of Rogers, Springdale, Prairie Grove, and Berryville, Arkansas.  Eleven indicators divided into three categories, Water Chemistry, Habitat, and Biological Characteristics, were used to develop this weight-of-evidence summary for the Illinois River and Kings River basins.  Based upon this weight-of-evidence approach, for the Illinois River sites, four sites scored as unimpacted, five sites scored as slightly impacted, two sites were determined to be impacted, and one was classified as severely impacted.  For the Kings River sites, two sites scored as unimpacted, one site scored as slightly impacted, and one site was classified as severely impacted.  The results of this project combined with other existing water quality data from the Illinois River basin and Kings River basin suggest a trend of declining water and habitat quality which is impacting the biological communities to varying degrees.

Parsons Engineering and Funding from US Environmental Protection Agency partnered in this study.

Marty Matlock, 479-575-2849,