The Oracle Road wildlife bridge is the first of its kind in the Sonoran Desert. The bridge measures 150 feet wide, the minimum width necessary to provide shielding from the sights, smells and sounds of the roadway below. The bridge was designed to accommodate the greatest number of species, and specifically for deer and bighorn sheep. Construction was completed in March 2016. New wildlife monitoring cameras captured a herd of mule deer using the bridge just a few weeks later. While it is not built to support full sized trees, the bridge has been seeded with native plants that will provide a natural environment and plant cover for smaller animals. Because wildlife will not use it while people are present, the bridge itself is closed to people, with an infrequent exception for official maintenance and research.