(KMOV) -- The Missouri River is already coming out of its banks.
On Tuesday, it's expected to crest six feet above flood stage.
It's causing moderate flooding for low-lying areas between St. Charles and Jefferson City.
The boat house at Frontier Park is already taking in some water, but it's designed to hold up to a foot of water before volunteers become concerned.
Those boats are historic replicas of the boats used in the Lewis and Clark expedition.
The flooding is not close enough to do any damage to historic Main Street, which is just a block away.
The water should recede by Sunday.