Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Comparison of (a) stream order; (b) watershed area (km2); (c) watershed slope (degrees); and (d) habitat condition index (risk of degradation) for existing (n = 50,772) and removed dams (n = 874), and dam removals with before- and after-removal studies (n = 63).
