A vehicle attempts to drive through a flooded area under the 53rd Street underpass in Corvallis. (Photo by Logan Hannigan-Downs)

The Marys River near Philomath remained in flood stage throughout Monday and forced the National Weather Service to extend its flood warning into Tuesday morning.

According to reported observations from the NWS, the river level surpassed 20 feet at 1 a.m. Monday. It steadily climbed throughout the day and crested at 20.95 feet at 7 p.m. Over the next few hours, the data showed that the river level was beginning to drop slightly. As of 9 p.m., the level was at 20.92 feet.

The NWS originally issued a flood warning for the Marys River at 12:36 a.m. with forecasted data indicating it would be lifted in the late afternoon. However, the river continued to rise and based on an alert issued at 3:43 p.m., the warning was extended to early Tuesday morning. The most recent information shows that the river is expected to drop below flood stage between 5 and 7 a.m. Tuesday.

Flood stage on the Marys River is considered to be 20 feet. The levels reached Monday evening approached the “major flood stage” of 21 feet.

The NWS advises that residents should expect widespread low land and agricultural flooding. Numerous roads along the Marys River have been affected with some structures near the river beginning to flood.

River flooding should be expected in sections of south Philomath, south Corvallis and parts of Highway 99W. City of Philomath workers have placed “high water” signs in the appropriate places in this community to alert motorists.

The Benton County Emergency Management has information on its website. For the latest observed and forecasted stages on the Marys River, go to the NWS website.

Mini-Gallery: Photographer Logan Hannigan-Downs stopped by the 53rd Street underpass in Corvallis on Monday and passed along some images seen below to the Philomath News.
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