摘要: |
Since the Nutty Narrows squirrel bridge was constructed in Longview, Washington in 1963, a wide range of projects have been implemented by state DOTs, local governments, and non-governmental organizations to remedy situations with high levels of road-related mortality for smaller wildlife, reptiles and amphibians. These projects include incorporation of measures into new roads, retrofits of existing infrastructure, and addition of infrastructure specifically for wildlife use. Many of these projects have also implemented post-construction monitoring to evaluate effectiveness. However, many of these projects are not known beyond the local area or state where they were constructed. As a result, the designs and lessons learned from their implementation are not available to inform current projects.
The purpose of this study is to gather and summarize existing information on crossing structures, passages, and exclusion barriers for small terrestrial mammals, reptiles, and amphibians. The information will be organized in a repository of design examples, plan sheets, and case studies of successes and lessons learned for a representative selection of projects. |