News release from the City of Coos Bay. On Wednesday, December 9, 2015, the City of Coos Bay experienced a sanitary sewer overflow of raw sewage from a manhole in the alley at 579 S. Broadway. The overflow was caused by heavy flows resulting from a high rain event. The Sanitary Sewer Overflow (SSO) event began at 1:00 am and subsided at 4:00 am. A total of 24,000 gallons of raw sewage was reported to Oregon Department of Environmental Quality, Oregon Emergency Response System, and Oregon Department of Agriculture regarding this event. For further information contact Wastewater Project Engineer Jennifer Wirsing at 541-269-1181 ext. 2247.