![]() ![]() ![]() Multi-use overpass in Florida, over Interstate 75, Ocala. Picture taken within on year of completion (2001). Note overpass is for multiple use and part of a larger greenway. Rosa.Įntrance to Florida overpass spanning Interstate 75, near Ocala, Florida. Wildlife overpass (7 m wide) Beaver, Utah. In selecting an appropriate size of overpass for future projects, perhaps a compromise between the wide (50 m) overpasses in Banff, and the narrow (7m-22m) overpasses in Utah and British Columbia may prove to be acceptable to target species while providing cost effectiveness, however it is not possible to determine minimum effective size with available data. Specifically, measures of human presence or disturbance may be important determinants of their use. More data is needed on the use of these structures. There is one overpass 15-22m wide over Interstate 78 near Berkley Heights, New Jersey which has anecdotal evidence of use by white-tailed deer and other species. It is approximately 7 meters wide and has sign of mule deer use (see picture). This is the first overpass built in North America (1975). The predecessor to the British Columbia overpass is in Utah over Interstate 15 south of the town of Beaver. There is an overpass approximately 7 meters wide in British Columbia over the Okanagan Connector Freeway near Peachland which has anecdotal evidence of mule deer use. The two overpasses in Banff and the multi-use passage in Florida are the only three North American overpasses seriously monitored for wildlife use. This passage spans a 6 lane divided highway. Bobcat use has been documented over the multi-use overpass along Florida's Greenway has documented bobcat use (see picture). It is possible that overpasses with less width would be used regularly if fencing was placed along the road right of way and was continually maintained. These are perhaps the best known and best documented overpasses in North America. Thousands of animal crossings have been documented across these two overpasses, including elk, mule deer, moose, grizzly bear, black bear, and puma (see Clevenger and Waltho 2000, 2005). These crossings have facilitated wildlife movement, in part because the accompanying fences are regularly maintained. ![]() Since their construction in 1997, they have been monitored with track plates, cameras and wire snags for hair samples for genetic analysis. They are 50 meters wide and have been designed to blend in with the natural surroundings with earth, bushes and trees on them (see picture). In Canada the two wildlife-exclusive overpasses in Banff National park have the best documentation of wildlife use data. In the United States these are found in New Jersey over Interstate 78 along with the exclusive wildlife overpass, and in Florida along the Florida Greenway Trail over Interstate 75. There are several other overpasses built for mixed uses such as wildlife and human recreation or unpaved roads. Gunson.īy early 2007 there were three overpasses in Canada (two in Alberta in Banff National Park, and one in British Columbia over the Okanagan Connector Freeway), and two in the United States that have been constructed exclusively for wildlife passage (one in Utah over Interstate 15 for mule deer, and one in New Jersey over Interstate 78 for white-tailed deer). As time progresses, the vegetation on the overpass will grow to resemble the nearby forest. Picture taken approximately 2000, three years after passages were installed. Wildlife overpass (known as the Wolverine Overpass) across the Trans Canada Highway, in Banff National Park, Alberta, Canada. They have been successfully employed in Europe and North America.įigure 2.1.1. Wildlife overpasses are among the most effective structures for allowing wildlife of many types to move relatively unimpeded across the road or railway. Wildlife and Roads: Decision Guide Step 2.1.6Ģ.1.1: Identify Species to Benefit from Potential MitigationĢ.1.2: Identify Ecological Processes (Water Flow, Animal Movement, Other)Ģ.1.3: Identify Landscape and Topographic Features That May Affect Movement and MitigationĢ.1.4: Identify Engineering and Maintenance ConcernsĢ.1.5: Weigh Cost Concerns with Potential BenefitsĢ.1.6: Identify Appropriate General Wildlife Crossing TypeĢ.1.8: References 2.1.6 Identify Appropriate Wildlife Crossing Type Overpasses ![]()
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