From LiveScience:
Satellite images have revealed that dozens of dams across the U.S. — including the biggest one in Texas — may be at risk of collapse due to the ground shifting beneath them. Inspections do not typically account for these movements, suggesting many dams in the country are in worse condition than previously understood.
The new findings raise the prospect that thousands of dams we haven’t been monitoring closely due to high costs and staff shortages could be damaged and at risk of failure. But how big is the problem, and is it worth using satellite data to provide early warnings?