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U.S. Army Corps of Engineers water managers expect an atmospheric river that’s dumping heavy rain in the Pacific Northwest will help refill some reservoirs this week.

Since the start of refill season for Corps reservoirs, there has been very little rainfall. Reservoirs in the Willamette and Rogue river basins rely on rainfall to refill and generally start filling Feb. 1.

“While every drop of precipitation helps right now, the atmospheric river appears to be impacting areas north of the Willamette Valley more significantly,” said Erik Petersen, operations project manager for the Wil...