The state today shut down fishing, swimming and other in-the-water activities at Anderson Lake State Park in Jefferson County. The public also is being told to keep pets out of the lake. The park remains open for land-based activities such as picnicking, hiking, biking and horseback riding. On Friday, the Jefferson County’s health department found high levels of the nerve toxin anatoxin-a in water samples. The toxin occurs in blue-green algae that periodically blooms in the lake. Anderson Lake has been closed off and on since the county started monitoring for the algae in 2007, according to a State Parks news release. Anderson Lake had opened on April 26 for the lowland trout fishing season. The lake will reopen after county health department tests show that water quality is safe for recreation. More information about the closure can be found on Jefferson County Public Health’s website at jeffersoncountypublichealth.org/index.php?anderson-lake-closed. For questions or concerns about toxic algae on lakes in that county, call Jefferson County Public Health at 360-385-9444 or check their web page for updates: jeffersoncountypublichealth.org/index.php?lake-water-quality. The 476-acre day-use park and is in eastern Jefferson County near Chimacum.