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Historic Mountain Dell Dam listed as 1 of 5 of Utah’s high-hazard dams. Repairs will be substantial for Salt Lake City, a state engineer says.

The windowlike arches on the outside of the towering Mountain Dell Dam provide an artistic facade that fits with the natural beauty of the Utah mountain canyon where the century-old structure sits.

The design's historical significance earned it a spot on the National Register of Historic Places and a designation as an American Water Works Association Landmark.

But the concrete structure also sits on a less desirable list: It is one of five dams in Utah and at least 1,688 in the United States that are in poor or unsatisfactory condition and located in places where a breach would likely kill at least one person, according to an investigation by The Associated Press.