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The Hoh River on the Olympic peninsula of Washington is one of the few rivers in the lower 48 states supporting relatively healthy wild salmon populations. In 1998, one clump of invasive knotweed plant was observed at the edge of the Hoh River. During a storm in the winter of 1999 or 2000, this one plant was transported downstream and from there rapidly established itself throughout the river. Knotweed is a threat to salmon and other wildlife habitat because it out-competes native riparian plant species and creates monocultures that provide little nutritive support for aquatic systems and poor erosion control along river banks relative to the natural plant communities it displaces.
Recognizing this threat to critical habitats, the Hoh Tribe initiated a restoration project in 2002, beginning the comprehensive river surveys, control, and effectiveness monitoring activities that continue today as a partnership between the 10,000 Years Institute, Hoh Tribe, Hoh River Trust, private landowners, Olympic National Park, and the U.S. Forest Service. To date, over 30 miles of the River have been treated for control and monitored, and an estimated 99.5% of the plants have been eradicated. The 10,000 Years Institute has taken a leadership position in implementing this program and communicating results. Our data is currently being used to support research papers on impacts and control methods through University of Washington and the Olympic National Park.
Click here to a link to progress reports.
KNOTWEED CONTROL ON THE HOH RIVER SUMMARY REPORT – 2002 TO 2004
KNOTWEED CONTROL ON THE HOH RIVER:2005 SUMMARY REPORT
KNOTWEED CONTROL ON THE HOH RIVER:2007 SUMMARY REPORT
KNOTWEED CONTROL ON THE HOH RIVER:2008 SUMMARY REPORT
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