As what’s expected to be the biggest storm of the season batters Northern California on Thursday, rivers throughout the region are expected to swell.

Creeks and streams in the Bay Area will likely rise only a few feet and won’t come close to flooding, but some flows on the North Coast and in the Sierra Nevada are predicted to reach moderate flood stage. As of Wednesday afternoon, the California-Nevada River Forecast Center predicted the Sacramento River at Fort Ord and the Truckee River in the town of Truckee may reach flood stage in the next 48 hours.