State Watch Contaminated Missouri Creek Will Get Radiation Hazard Signs Coldwater Creek in suburban St. Louis has exposed generations of children to radioactive material left after World War II, the Missouri Independent reports. Meanwhile, the EPA's data on the Ohio train derailment is said to obfuscate contamination levels. Missouri Independent: Missouri's Coldwater Creek To Get Radioactive Waste Signs Federal officials plan to post warning signs along a contaminated suburban St. Louis creek where generations of children were exposed to radioactive material. Coldwater Creek, which winds between homes and parks in St. Louis County for 14 miles before meeting the Missouri River, is plagued with nuclear waste left over from World War II. For decades, families had no idea the danger it posed to the children who played along its banks and swam in its waters.