Areas of the McNary National Wildlife refuge remain closed due to toxic algae being discovered in the Burbank area. Repeating studies show elevated levels of algae which is cyanobacteria, cyanobacteria can kill not just pets, but also waterfowl and other animals. Last summer at least three known dogs died, even before their owners could get them to a veterinarian. The toxin surprised public health experts who had never seen it there before, sampling is being done on the river every two weeks since July.  The McNary Refuge is a popular destination for bird watchers and nature lovers.