Signs posted on the Oregon shore of the Columbia River in The Dalles area resulting from sewage overflow caused by a plugged sewer pipe will remain up until at least Tuesday.  The Dalles Public Works says another status update will be made Tuesday afternoon.  A plugged sewer pipe discovered Friday sent sewage overlow directly into Mill Creek and into the Columbia River.  According to The Dalles Public Works, a wastewater collection crew conducted a routine inspection at the manhole at the 9^th Street Bridge over Mill Creek, and found the lock had been broken and vandals had thrown rocks and concrete pieces into the manhole, causing a plugged sewer pipe.  The sewer pipe has been cleared and the pipe has been repaired.  Out of an abundance of caution, warning signs advising no water contact were placed at locations of public river access on the Oregon shore of the Columbia River, from The Dalles Riverfront Park to West Mayer Park boat launch.