The NOAA Algae bloom report shows it was expanding.
http://www2.nccos.noaa.gov/.../bulletin/bulletin_current.pdf
If they saw it happening, then why didn’t they start killing it off? That is what we do here in the South. Spray it from planes. There are several EPA approved ways to kill off algae.
http://www.ecy.wa.gov/programs/wq/plants/algae/lakes/controloptions.html
Now they have a problem that may take years to get back under control.