The Iowa DNR Atlantic Field Office was notified Monday morning, August 21st, of discolored water in an unnamed tributary of the North Raccoon River, approximately two miles east of the City of Cooper in Greene County.  According to the caller, the discolored water was first observed on the evening of Friday, August 18, 2023.

Black, pooled water has been observed in several areas behind beaver dams. The stream has low flow, and no dead fish were observed in the area.  DNR field tests showed elevated ammonia levels.

Water samples have been collected and sent to the State Hygienic Laboratory for further analysis. The investigation is ongoing. Swimming and recreating in the area is not recommended until additional information is gathered.

Anyone who might have information on the incident is asked to contact the DNR Field Office 4 in Atlantic at (712) 243-1934.