The Health of Key Murray River sites has dropped from a 'B' to a 'C' in the latest Murray Darling Basin Authority (MDBA) report card.
Drought is causing the health of the Lower Lakes, Coorong and Murray Mouth to go backwards, according to the MDBA's 2017 to 2018 report, which is out this week.
While the region's water health improved following the delivery of environmental water and natural flooding in 2016, the dry season that preceded it has caused a decline.
The report reveals that fewer than half of the ecological objectives are being met in the lower half of the basin.
However, other areas in the basin have drastically improved, with the combined grade of all sites rising from a 'D' a decade ago to a 'B' in the latest report.
Image: denisbin, Flickr - Salt Creek flowing into the Coorong waterway.