E. coli bacteria levels at the Robie Creek Beach access in the Mores Creek arm of Lucky Peak Reservoir are in excess of state water quality standards, the U.S. Corps of Engineers said Friday in a news release. The source of the bacteria is unknown at this time.

Warning signs have been posted at the beach.

Looking for an alternative location for recreation? Consider Barclay Bay Beach in Lucky Peak Reservoir or Sandy Point Beach downstream from Lucky Peak Dam.

Excess levels of E. coli indicate the presence of human or animal waste and that pathogenic microorganisms may be present and pose a threat to public health, Corps officials say. If ingested, these microorganisms can cause diarrhea, fever and vomiting, particularly in infants, small children and the elderly.

To be safe, DEQ recommends that any activity that may result in the ingestion of reservoir water be avoided at the Robie Creek Beach recreational area. These activities include swimming and wading in the water.