The rains the last week of December 2015 came hard and fast, dropping close to 10 inches of water in some parts of the region during the final days of the year. By the time the downpour stopped, St. Louis had broken its record for annual rainfall.
The Mississippi and Missouri rivers swelled, threatening the levee protecting the Portage des Sioux area and inundating parts of St. Charles County. Hundreds of St. Louis residents came out to help sandbag the River Des Peres.
But hardest hit were Union, Pacific, Eureka, Arnold and other areas along the Meramec River basin. As the Meramec crested higher than ever along the St. Louis County border, more than 2,000 homes and businesses in the region were flooded, causing hundreds of millions of dollars in damage.
Here's a look back at the scenes from that flood from the final week of 2015.