Myriophyllum spicatum
Myriophyllum spicatum
(Eurasian watermilfoil)
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7 results for Myriophyllum spicatum (Eurasian watermilfoil)
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Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
1749073 CAContra Costa[No locality description provided]2022 18040003 San Joaquin Delta 
1436147 CAContra Costaat SW corner of Contra Loma Park, East Bay Regional park, Antioch.2001 18040003 San Joaquin Deltaestablished
252716 CAContra CostaContra Loma Park, Antioch; pond in SW corner2001 18040003 San Joaquin Deltacollected
1436134 CASan JoaquinChannel south of islands in Sacramento--San Joaquin Delta on the Fourteen Mile Slough.1999 18040003 San Joaquin Deltaestablished
252713 CASan JoaquinFourteen Mile Slough, islands in Sacramento-San Joaquin Delta1999 18040003 San Joaquin Deltacollected
1436189 CASan JoaquinRobert's Isl., Trapper's Slough1948 18040003 San Joaquin Deltaestablished
229292 CASan JoaquinTrapper's Slough off Robert's Island1948 18040003 San Joaquin Deltaestablished

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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For general information and questions about the database, contact Wesley Daniel. For problems and technical issues, contact Matthew Neilson.