The Red River was measured at its minor flood stage of 28 feet at 8:30 p.m. on Wednesday.
In contrast, the Flood of 1997, the disastrous flood of record, exceeded 54 feet.
The National Weather Service issued its first flood warning of 2011 on Wednesday for the Red River at East Grand Forks, affecting Polk and Grand Forks counties.
Local runoff from snowmelt is causing the rise along rivers within the Red River Valley, the weather service said in its statement.
The river is expected to rise to near 32 feet by next Wednesday evening, with additional rises expected thereafter, the weather service said.
Minor flooding is forecast for the Red at Grand Forks and East Grand Forks for the next seven days, the weather service said.