We began working on the Avenue 416 Bridge Replacement Project in Tulare County in 2001, conducting an initial habitat assessment, and then developing measures for avoidance and minimization for take of roosting bats. We updated our work in 2011 as the project was finalized and ready to go to construction; at that time we designed mitigation roost habitat modules and recessed features to be incorporated into the new bridge. Cornerstone Structural Engineering Group handled the engineering and drafting of the sketched details provided by Greg, that feature day roosting crevices and night roosting spaces. Cornerstone had designed decorative soffit details, which Greg modified with additional bat habitat features. Greg then worked with Dokken Engineering to develop and implement safe, effective humane exclusion and eviction of thousands of bats roosting in the original concrete bridge in 2012.
In the first year of post-construction monitoring, Greg observed approximately 4,000 bats, comprised of 4 species – substantially increased over the approximately 1,200 individuals present in the original bridge. Additional monitoring will be conducted by Wildlife Research Associates.
Heidi J. Williams, Director of Communications for the Santa Clara University School of Engineering, wrote about the project after Cornerstone Engineering Group won an Honor Award from ACEC California. Much of the success was due to the bat habitat, according to Shawn Cullers of Cornerstone, who was also presenting the project for consideration of a similar award on a national level. Click on the thumbnail below for a scan of the article, or go to: