Suggested Citation:
Shilling, Fraser M., Noah Thoron, David P. Waetjen (2024)

Predicting Wildlife Use of Existing Highway Bridges and Culverts

. Institute of Transportation Studies, University of California, Davis, Research Report UCD-ITS-RR-24-06

Abstract:

Departments of Transportation (DOTs) are increasing attention to wildlife connectivity needs across highways, which is reflected in the inclusion of $350 million in new funding in the Bipartisan Infrastructure Law. There are over 600,000 bridges along US highways, approximately 75% of which are over waterways and could be useful for wildlife connectivity. The purpose of the proposed project was to develop an accessible model that DOTs could use to predict wildlife use of existing culverts and bridges and to look for cost-effective ways to increase wildlife use of existing structures. We collaborate with the DOTs and/or Departments of Fish and Wildlife/Parks (etc.) of AZ, CA, CO, FL, GA, ID, ME, MT, NV, OH, OR, and VA and the Alberta MOT to describe a predictive model for wildlife use of existing structures, based on evidence of use of these structures. Using camera trap data from CA, CO, ME, OR, VA, and WA, we developed a statistical model using structure and near-landscape characteristics, and evidence of wildlife use from camera traps. We are currently developing a website for state DOTs to use the model to predict which structures are likely to be useful for wildlife and which not. This will assist their planning and programming wildlife connectivity enhancements for areas not served by existing structures.