PORTLAND, Ore. (KATU) — Heavy rains over the weekend caused a rare combined sewer overflow (CSO) into the Willamette River as the Big Pipe system reached capacity around 2:30 p.m. on Sunday ...

PORTLAND, Ore. (KOIN) — A combined sewer overflow advisory is in effect for the Willamette River following the weekend’s heavy rains, the City of Portland announced on Sunday afternoon.

Sewage and stormwater began spilling into the Willamette River around 2:30 on Sunday afternoon, when weekend rains overflowed Portland’s Big Pipe system. The sewage-stormwater mix drained into ...

Human Access Project, an advocacy group formed to promote a safer Willamette River, hosted the swim to celebrate a full year without any Combined Sewer Overflows (CSOs). Campfires and saunas were ...