Three volunteers stand in a shallow stream. One volunteer holds a seine net, while the other two bend over and jostle rocks with their hands in order to release macroinvertebrates into the net.
Izaak Walton League volunteers collect macroinvertebrate data that will inform conservation and restoration decisions. (Photo courtesy of Ashley Palmer)
A kayaker paddles on the Potomac River in Great Falls Park.
Many of the streams the Izaak Walton League monitors feed into larger bodies of water, like the Potomac River and eventually the Chesapeake Bay. Keeping these headwater streams healthy is critical for the health of the entire watershed. (Photo by Kaitlyn Dolan/Chesapeake Bay Program)

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