Research for the AASHTO Committee on Environment and Sustainability. Task 102. Artificial Bat Roost Mitigation Designs and Standardized Monitoring Criteria

Bridges are an important resource for bat roost habitats in many states across the U.S., primarily due to increasing pressures from forest habitat loss, wildfire, and spread of white-nose syndrome. The Indiana bat and the northern long-eared bat are listed as Federally Endangered and Federally Threatened under the Endangered Species Act (ESA), respectively. Given requirements within the ESA, a better understanding of artificial bat roost designs, long-term maintenance needs, criteria for monitoring success, and best design practices is needed to guide mitigation decisions made by transportation professionals. Information is available on existing bridge designs and bat roost use and features. However, an analysis of transportation structures and site-specific factors that influence the performance of bat roost mitigation is needed.   The purpose of this research is to conduct an analysis of transportation structures and site-specific environmental factors that influence the performance of bat roost mitigation in order to inform best mitigation design practices, and to develop a manual of best design practices. Tasks include: Task 1: Gather background data via lit review and interviews with key professionals on key microhabitat and site criteria that influence the use of on-site (bat houses installed within or mounted to bridge/box culvert structures) and offsite (standalone bat houses) artificial bat roosts. Cost information for design, construction, and maintenance of various mitigation designs will also be collected. The effects of recent developments in bridge design and construction methods upon bat roost mitigation designs will be described. Task 2: Conduct a comparative performance analysis of bat roost designs comparing structure types, site-specific conditions, monitoring opportunities, and costs for typical mitigation goals (re-establishing colonies after construction, providing habitat for maternity colonies, providing evidence of occupancy for target species, any unique needs for threatened or endangered species). Task 3: Prepare a Best Design Practices Manual that includes the results of Task 1, compilation of monitoring data, and the comparative performance analysis.


  • English


  • Status: Active
  • Contract Numbers:

    Project 25-25, Task 102

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001

    National Cooperative Highway Research Program (NCHRP) Synthesis

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC    20001
  • Project Managers:

    Hartell, Ann

  • Performing Organizations:

    Louis Berger Group

    30A Vreeland Road
    Florham Park, NJ  United States  07932
  • Principal Investigators:

    Sparks, Dale

  • Start Date: 20171127
  • Expected Completion Date: 20190526
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01649730
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 25-25, Task 102
  • Files: TRB, RiP
  • Created Date: Oct 27 2017 3:04PM