Rebecca Stefoff
Author
Language
English
Formats
Description
The Hoover Dam is called one of American's seven modern civil engineering wonders. Hurdles to clear included building access roads, diverting the Colorado River, and creating a way to cure massive amounts of concrete quickly enough to complete the project on time. Readers will learn how what was then the world's tallest dam was built in a region that presented challenges in geography and weather.
Author
Language
English
Formats
Description
The Erie Canal was mocked as a big ditch when it was started, but by the time it was completed in 1825 it was called an engineering marvel. Readers learn how engineers overcame a rise in elevation of 568 feet between the Hudson River and Lake Erie with locks and aqueducts to create a waterway that changed America.