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I'm interested in better understanding the ongoing geological processes that shape St. Louis and the Mississippi Valley region. So far, I've been looking into the history of seismicity in the region, focusing on the fascinating but little known history of the New Madrid earthquakes of 1811 and 1812 -- the most devastating earthquakes to have hit the US east of the Rockies. I've also been exploring how St. Louis and surrounding areas are dealing with the possibility of another earthquake occurring in the future. According to one article I read, one of the biggest uncertainties is what would happen to the heavily engineered Mississippi River in the case of another major tremblor. The shaking could break the levees, flooding wide areas along the river and creating cascading effects. The flow of the river might also reverse completely, as occurred during the New Madrid earthquakes.

On these possibilities and the lack of scientific consensus surrounding intraplate seismicity in this zone, see this article in The Atlantic.

On current efforts to create earthquake hazard maps in St. Louis, see this overview on the US Geological Survey site.

For a deeper dive into the history of the New Madrid earthquakes, see this book by historian of science Conevery Bolton Valencius. 

in March of 2016, environmental officials had finally decided to remove over a century worth of toxins and waste from the lower 8 miles of the Passaic River. This part of the river was known as the most dangerously tainted portion of the river. 

one of the main issues that presents itself when hurricanes do occur is that the drainage systems become very clogged and end up flooding the streets. In response to this, on July 1, "new state permits went into effect for the 25 municipalities, sewage treatment plants, and sewage authorities that manage systems with CSOs. In addition to the steps these entities already have taken to control overflows, they now must develop comprehensive Long-Term Control Plans." (paragraph 5) If everything is able to function properly, we will be able to unclog the drainage systems allowing for the roads to not flood and people to move around if need be. 

there are some pollutants that affect the community and in other places:

• particle pollution and ground-level ozone pollution
• sulfur dioxide and nitrogen dioxide
• lead
• carbon monoxide

nothing was really done to prevent anything from happening. The river was known for its dirty and polluted waters which occured due to years of industrial toxin buildup in the waters. 

one of the main vulnerabilities is that there is a large amounts of sewage and trash polluting the water and it gets sucked into the overflow system that are used to prevent flooding. this further pollutes the surrounding are and further poisons the environment.