It’s currently above flood stage.
...Flood Warning extended until Tuesday evening... The Flood Warning continues for The Monocacy River near Frederick. * Until Tuesday evening. * At 11 AM Monday the stage was 20.8 feet. * Flood stage is 15.0 feet. * Major flooding is occurring and Major flooding is forecast. * Recent activity...The maximum river stage in the 24 hours ending at 11 AM Monday was 20.8 feet. * Forecast...The river will continue rising to near 20.9 feet by mid-afternoon today. The river will fall below flood stage late tomorrow afternoon. * Impact...At 21.0 feet...Maryland Route 26 is flooded near the Monocacy River bridge. * Flood history...This crest compares to a previous crest of 21.8 feet on Oct 31 2012. By The National Weather Service