A giant sinkhole that forced the closure of part of a Colorado highway was caused by an old, abandoned railroad tunnel, according to a Thursday report.
An article on Yahoo.com said the 20-foot-wide, 100-foot-deep sinkhole was caused by thawing soil in the century-old tunnel that collapsed decades ago.
Part of the U.S. 24 between Leadville and Red Cliff was reportedly closed this week as a result. Read more.
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