Out of the more than 30,000 road-stream crossings in Maryland, the U.S. Fish and Wildlife Service and partners have assessed approximately 1,000. With an average of one road-stream crossing every 1.3 miles in the Northeast, the ability to prioritize which crossings are the most severe inhibitors to safety and fish passage allows for the best distribution of resources. Credit: Steve Droter

Devers smiles in front of one of the 3 percent of culverts that biologists like her have assessed in Maryland. Credit: Steve Droter