LAKE MEAD NATIONAL RECREATION AREA, Ariz. (AP) -- Along with the new Hoover Dam bypass bridge are three smaller concrete spans in northwest Arizona. The only traffic they carry is the four-legged kind.
The overpasses were built by the state for wildlife, specifically the desert bighorn sheep that roam the Black Mountains.
The three structures cost nearly $5 million.
But wildlife authorities say the first-of-its-kind project will help save Arizona's largest herd of bighorn sheep and improve highway safety by keeping the animals away from busy traffic along U.S. 93.
An education manager for state Game and Fish tells The Arizona Republic that movement is critical for bighorn sheep in order to keep the population healthy and growing.
Information from: The Arizona Republic, http://www.azcentral.com
Copyright 2011 The AP.