The Oregon Health Authority issued a recreational use health advisory Tuesday, Sept. 11 for higher-than-normal levels of bacteria in ocean waters at D River Beach, located in Lincoln County and Twin Rocks Beach, located in Tillamook County.  Water samples indicate higher-than-normal levels of fecal bacteria, which can cause diarrhea, stomach cramps, skin rashes, upper respiratory infections and other illnesses. People should avoid direct contact with the water in this area until the advisory is lifted. This applies especially to children and the elderly, who may be more vulnerable to waterborne bacteria.