State police, fish biologists and Ashland city officials are investigating an apparent fish-kill in lower Ashland Creek along and downstream of the city's Waste Water Treatment Plant.
Ashland Director of Public Works Mike Faught said an unspecified number of fish he could not identify were found in that reach of the creek.
The plant discharged treated effluent into Ashland Creek and it was not known late Monday whether the die-off was caused by effluent released from the plant or some other source.
Faught said there were no changes to dissolved oxygen levels in the plant's discharge and there were no signs of toxic poisoning within the plant's treatment regimen.
Changes in dissolved oxygen or toxic are two common causes for some fish-kills.
The dead fish apparently were discovered by a private citizen who notified Oregon Department of Fish and Wildlife biologists in Central Point, Faught said. ODFW officials called city public works crews and an investigation was launched, he said.
Ashland Creek is a Bear Creek tributary that flows through Ashland's Lithia Park and portions of city neighborhoods before reaching the treatment plant area close to its confluence with Bear Creek.