The flooding Meramec River has already washed out some fields and parks and is now threatening homes.
The Arnold city park is underwater and sandbags are up in the backyards of two homes that back up to the park.
The threatened homes are on Convair drive near Electra.
Some 40 people worked 12 hours yesterday to put thousands of sandbags up.
The city of Arnold dropped off eight dump trucks full of sand and then people went to work.
Now, many are hoping the sandbag wall holds.
Residents here are hopeful that the wall will hold back the Meramec flood waters.
The river level is at about 37 feet now.
The Meramec is supposed to crest at 38.5 feet tomorrow night.
That is below the 2008 level and well below the 93 crest.
Water did not get into homes here in 2008 so residents believe they can win the flood fight.