Aimed at boosting biodiversity, improving water quality and strengthening flood protection amid worsening storms, the campaign to demolish dams dates back several decades but has intensified with a once-in-a-generation funding infusion from the $1 trillion bipartisan infrastructure bill. More than $2 billion is going to federal agencies, including the U.S. Fish and Wildlife Service, National Oceanic and Atmospheric Administration and Federal Emergency Management Agency, for maintaining, repairing and removing dams, culverts and other barriers. Of that, $920 million has already been spent on 544 projects. The wildlife service is getting $200 million over five years for dam removal. In April, the agency announced plans to award $70 million in grants, supporting 43 projects to remove dams and other river barriers in 29 states. … Some large dam systems are being removed, including four Klamath River dams in California — the largest removal project in history. But most dams being demolished are relatively small.