For more than a decade, survey flights have crisscrossed the United States using gravity instruments to calculate a new sea level in an effort that will save the country billions of dollars on ...

ABIQUIU LAKE, N.M. -- Throughout the 56 years the U.S. Army Corps of Engineers, Albuquerque District has been operating Abiquiu Lake as a flood control and water supply dam in the Chama River Valley ...

Climbers descend along Borah Peak’s Chickenout Ridge. Borah is actually four feet taller than traditionally thought, according to data from a new elevation measurement technique. Idaho Statesman file ...