The Columbia River is nearing its 16-foot flood stage, likely crossing into the threshold sometime today, according to the National Weather Service. That means there could be flooding in low-lying areas along the river's bank.
Some area parks and trails near the water have already flooded.
As of 6:48 a.m., the river was 15.91 feet above sea level, according to the weather service. The river spent much of Monday at about 15.7 feet.
The Columbia fluctuates about six inches during its high to low tide cycle. That, along with light rain, was enough to flood a 60-foot section of Vancouver's Waterfront Renaissance Trail Monday evening after it had spent most of the day dry.
"Wet weather anticipated midweek may result in additional river rises late in the week," the weather service wrote in a bulletin.
Here's the rest of the week's forecast:
Wednesday: Rain. High near 58. Calm wind becoming southwest between 5 and 8 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night: Showers likely. Cloudy, with a low around 46. South southwest wind between 5 and 7 mph. Chance of precipitation is 70%.
Thursday: Showers likely, mainly after 11am. Mostly cloudy, with a high near 58. South wind between 7 and 10 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch possible.
Thursday Night: Rain likely. Mostly cloudy, with a low around 48. Chance of precipitation is 60%.
Friday: Showers likely. Mostly cloudy, with a high near 59. Chance of precipitation is 60%.
Friday Night: A chance of showers. Mostly cloudy, with a low around 46.