Breach could put 431,000 people in harm’s way

…Even before last spring’s rains, the Lewisville Dam was listed by the Corps as the eighth-most-hazardous in the country. Recent rains have made it worse, the Corps says.

The dam is so unstable now that the Fort Worth District is considering asking Corps headquarters to upgrade its risk classification to the highest: “critically near failure” — that is, “almost certain to fail under normal operations … within a few years without intervention,” according to a Corps document.…