River Des Peres

Map of major watersheds in the St. Louis area.
Metropolitan St. Louis Sewer District

The "cloud burst" that drenched a mid-section of St. Louis County with nearly four inches of rain early Monday morning is only part of why local streams and creeks swelled their banks, flooding businesses and several busy streets.

Forecasters called it a 25-year rain event, but similar flooding took place just eight months ago and to many county residents it's also reminiscent of flooding in 2008.

Chris Weiss and John Koch load tires into a trailer at Gravois Creek near Grant's Trail on Saturday, October 18, 2014.
Camille Phillips/St. Louis Public Radio

As water flows south through the River des Peres Watershed in St. Louis, trash, tires and metal gets deposited along the way. Over the weekend, hundreds of volunteers worked to pick up all that trash during the sixth annual cleanup called the River des Peres Trash Bash.

At Gravois Creek on Saturday morning, about a dozen volunteers stacked muddy tires into a trailer hitched to a four-wheeler.

Earlier, volunteers had fished the tires out of the creek using canoes. By mid-morning, volunteer Doug Geist estimated that they had collected more than twenty tires.

(via Flickr/pasa47)

The EPA today issued its decision on Missouri's water quality standards, approving how the state categorized 244 streams, rivers and lakes.

That decision means water bodies newly designated for high contact uses like swimming will need more protection.

Some sewage treatment plants, municipalities and others will need to start treating their wastewater discharges.