Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Upper Midwest Environmental Sciences Center
UMESC - Celebrating 50 Years of Science for a Better World - 1959-2009

UMESC Gallery

USGS and University of Wisconsin at La Crosse scientists testing methylmercury contamination of fish in Voyaguer's National Park: Full resolution

USGS and University of Wisconsin at La Crosse scientists testing methylmercury contamination of fish in Voyaguer's National Park

Photo by Brent Knights, USGS, UMESC, May 2000

Usage: This image is public domain/of free use. Please refer to the USGS Copyright section for more details.