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Conservation Highlight

Proposed Island Marble Butterfly CCAA

The USFWS and WDFW have been developing a programmatic Candidate Conservation Agreement with Assurances (CCAA), a voluntary way for landowners to help conserve the island marble butterfly while receiving regulatory assurances.  The island marble butterfly is proposed for listing as an Endangered species.  To learn more about what the CCAA is and how it would work, please visit our Island Marble Butterfly CCAA webpage.



Documents for Review

The Hyporheic Zone

  • Video Reveals Little Known World of Riverbeds

    Not all that you see when you look at a river is above ground.  There is a hidden world that exists beneath the bottom, in the vast network of interconnected spaces between the pebbles that make up the streambed.  Scientists call this the hyporheic zone.  The hyporheic zone is a place where water flowing in the stream channel percolates down into the streambed, mixes with groundwater, and reemerges to join the surface water somewhere downstream.  The hyporheic zone is important because it helps to cool, filter, and cleanse the stream water, and also because strange, vital things are living there.

    Watch “The Secret Life of Rivers,” a short video introduction to the world of the hyporheic zone. 

  • More USFWS publications

  • USFWS Newsletters USFWS Scientific Journals
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