The Dalles Public Works Department says water quality testing conducted at three locations near the 9th Street Bridge over Mill Creek show that conditions have returned to normal for this time of year. Signs which were placed at locations of public river access on the Oregon shore of the Columbia River, to warn of contaminated water, were taken down Thursday afternoon. The signs went up last Friday after a Public Works crew found a manhole on the 9th Street Bridge over Mill Creek had been plugged by vandals. They found the lock had been broken and vandals had thrown rocks and concrete pieces into the manhole, causing a plugged sewer pipe. Sewage overflowed directly into Mill Creek and into the Columbia River. The sewer pipe was cleared and the pipe was repaired on the day the problem was found. The Public Works Department notes that Mill Creek is posted with “No Trespassing” signs year-around throughout The Dalles to allow for undisturbed fish spawning.