advertisement
22 August 2022
The Desert Bighorn Sheep is an essential part of the wildlife in northwest Arizona, yet highways have separated and endangered these populations. Due to wildlife-vehicle collisions, interference with access to adequate water, and lack of habitat connectivity, bighorn populations are at risk.
To increase genetic diversity, many sheep do not need to migrate from one subpopulation to another. However, sheep become more vulnerable to outside threats if their genetic diversity diminishes. For example, an isolated herd of fewer than 50 animals can be wiped out by disease or drought. In addition, localized catastrophes such as drought could last so long that the animals cannot replace themselves and die.
advertisement
A bighorn population would naturally replace another population that had declined before artificial barriers fractured its habitat. However, if these areas are cut off from one another, the natural process of refreshing a population is not possible.
Bighorn sheep walked across valleys when they sought mates, food, water, or whatever else, drawing them to an adjacent mountain range before humans created barriers. In addition to fragmenting wildlife habitats and blocking connectivity between populations, highways also destroy and degrade home ranges. Highway construction has destroyed or altered at least 20 percent of wildlife habitats in the U.S., according to studies conducted in 1998 and 2000. Collisions also reduce wildlife populations with vehicles on roads. Other studies estimate 500,000 and 700,000 deer are killed on U.S. highways yearly.
As part of a historic and innovative collaboration between the U.S. Fish and Wildlife Service, Federal Highway Administration, and Arizona Department of Transportation, the Arizona Game and Fish Department developed a solution that saves bighorn sheep and drivers. 3 wildlife overpasses and adjacent funnel fencing were constructed along Highway 93 north of Kingman to reduce vehicle collisions with bighorn sheep. As a result of this infrastructure, wildlife can cross over roads safely, keeping them connected to their habitat and reducing the risk of injured motorists and wildlife.
advertisement
Unlike most highway overpasses, the bighorn bridges have dirt surfaces planted with native grasses on top of concrete overpasses. The sheep are guided safely toward three bridges, two of which are 50 feet wide, and the third is 100 feet wide, by funnel fences. In addition, sheep are prevented from jumping off bridges onto roads by parapet fencing.
After the U.S. 93 reconstruction mitigation measures, the crossings are already showing positive results with active monitoring. Findings already show that Desert Bighorn Sheep vehicle collisions dropped by at least 85 percent.
advertisement
Arizona is known for the Grand Canyon, cactus-filled deserts, and dramatic sunsets. But beyond the obvious, the Grand Canyon State is packed with surprising history, natural oddities, and quirky records. Here are some fun Arizona facts that might just impress your friends at your next trivia night. advertisement 1. Arizona Does Not Observe Daylight Saving Time Most of Arizona does not observe Daylight Saving Time, which means the state stays on Mountain Standard Time all year long. The exception is the Navajo Nation, which does observe Daylight Saving Time. So you can cross into a different time zone just by
Arizona is famous for desert landscapes and natural wonders, but the state’s museums tell stories just as powerful. From ancient Indigenous cultures and Western history to modern art and musical legends, Arizona museums offer something for every kind of curiosity. Whether you live here or are planning a visit, these are ten standout museums that showcase the depth, creativity, and history of the Grand Canyon State. advertisement 1. Heard Museum Phoenix The Heard Museum is one of the most respected Native American museums in the country. Its exhibits focus on Indigenous art, culture, and history, with a strong emphasis on
When most people think of Arizona, they picture deserts, saguaros, and red rock cliffs. Fishing is not usually the first thing that comes to mind. But Arizona quietly offers some of the most diverse and underrated fishing in the Southwest, with everything from mountain trout streams to desert reservoirs full of bass and catfish. Whether you are a weekend angler or just looking for a new outdoor hobby, Arizona has water, fish, and year-round opportunities. advertisement What You Can Catch in Arizona Arizona’s variety of elevations creates a wide range of fishing options. In the high country, cooler waters support
When people hear “snowbirds,” they usually picture retirees escaping icy northern winters for Arizona sunshine. But the state’s true snowbirds arrive on wings, not wheels. Every winter, Arizona becomes an unexpected hotspot for migrating birds from across North America. From massive white pelicans gliding over desert lakes to honking flocks of geese touching down in farm fields, Arizona transforms into a seasonal refuge for birds seeking warmer weather, open water, and reliable food sources. And yes, you can see them without leaving the desert. advertisement Why Birds Choose Arizona for the Winter Arizona may be known for cacti and red
