The Oregon Health Authority today lifted the recreational use health advisory for Detroit Lake and is launching a new system for lifting advisories at the water body to ensure health officials and the public that a harmful algae bloom has dissipated.
Water monitoring has confirmed that the level of cyanobacterial toxins in Detroit Lake are below recreational guideline values for human exposure. OHA issued its recreational advisory for the lake—located 46 miles southeast of Salem, and spanning Linn and Marion counties—on June 13.
In ending the Detroit Lake advisory, OHA is following a new protocol that calls for lifting a recreational advisory when test results show cyanotoxin levels in water samples taken from Detroit Lake on three consecutive days are below recreational guideline levels, and that City of Salem visual assessments near sampling locations find the algae bloom has subsided.
OHA received below-guideline test results June 20, 21 and 22. The city completed its visual assessment of the lake June 24.