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When the dam that created a major American reservoir was built decades ago, Native American cliff dwellings and artifacts were submerged. Now, they're emerging as drought lowers water levels.

The hardy tamarisk, which arrived from Asia, is crowding out native plants in many Western states. It chokes small streams and rivers and sucks up scarce water. And it's hard to get rid of it.

Catastrophic damage by flooding earlier this week in Yellowstone National Park likely means that the northern half of the park will remain closed the rest of the year.

When the Hoover Dam was finished in 1935, it was three times larger than any other dam on the planet. Journalist Michael Hiltzik examines the humongous engineering achievement — including how the Hoover Dam was conceived, designed and built — in a new book, Colossus.

Farms along the Connecticut River are experiencing losses from flooding this week. Some farmers who were just days away from harvest now face the prospect of entire crops ruined by contaminated water.

Andy Davidson's novel follows a young girl who scrapes a living working for local criminals along an Arkansas river — but its crime story bumps up against horror in a strange yet seamless fashion.

A visit to the Rio Grande in Eagle Pass, Texas, by kayak. That's where Gov. Greg Abbott has installed a floating barrier made of giant buoys to deter migrants

The scene was relayed by a live webcam of bears on Alaska's Brooks River. “This is very difficult to watch and comprehend,” said Naomi Boak of the nonprofit Katmai Conservancy.

The U.S. has hit an unwelcome milestone in measles cases this year. The CDC is reporting 1,288 cases across the country. The disease was declared eliminated 25 years ago.

On a wooded river island, a Ukrainian family guards the legacy of the Zaporizhzhian Cossacks, whose history and traditions are making a comeback during the war.