Myriophyllum spicatum
Myriophyllum spicatum
(Eurasian watermilfoil)
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8 results for Myriophyllum spicatum (Eurasian watermilfoil)
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Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
246175 ORColumbiaSauvie Island, along land joining Oak and Sauvie Islands, in a branch of the Gilbert River1981 17090012 Lower Willamettecollected
1762247 ORMultnomah[No locality description provided]1981 17090012 Lower Willamette 
1762426 ORMultnomah[No locality description provided]1981 17090012 Lower Willamette 
242683 ORMultnomahColumbia Slough, Portland2003 17090012 Lower Willametteestablished
1815755 ORMultnomahMultnomah Channel2015 17090012 Lower Willamette 
859082 ORMultnomahSauvie Island1981 17090012 Lower Willametteestablished
859051 ORMultnomahSauvie Island1981 17090012 Lower Willametteestablished
1468155 ORMultnomahSmith and Bybee Wetlands Natural Area2018 17090012 Lower Willametteestablished

Data Disclaimer: Number of records does not imply species abundance. This summary represent collection records only and may not reflect the actual distribution of established populations. These data are preliminary or provisional and are subject to revision. They are being provided to meet the need for timely best science. The data have not received final approval by the U.S. Geological Survey (USGS) and are provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the data.

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The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2026]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [1/20/2026].

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