AFTON, Okla. – The Grand River Dam Authority (GRDA) is urging caution around area of Grand Lake’s Horse Creek because of the presence of a toxic blue green algae (BGA) bloom.
Most recent testing by GRDA shows the Horse Creek bloom varying in toxin levels from 5 micrograms per liter to more than 20 micrograms per liter. Environmental Protection Agency recommends contact no more than 8 micrograms per liter.
At this time, GRDA’s ongoing monitoring suggests that the Horse Creek bloom remains the primary area of concern and will continue to monitor for additional blooms throughout the lake.
“Again, we want the public to be aware that the overwhelming majority of Grand Lake does not show any signs of BGA and is ready for visitors to come and enjoy,” said GRDA Vice President of Corporate Communications Justin Alberty. “However, we are continuing with our daily testing and surveys all across the lake because conditions can change rapidly.”
BGA may resemble thick pea soup, green paint or bluish, brownish or reddish-green paint. When BGA washes up on shore, it can form a thick mat on the beach. BGA can reproduce rapidly in water bodies with adequate amounts of sunlight and nutrients such as phosphorous and nitrogen. It is recommended that individuals avoid swimming or participating in water recreational activities in areas where the water is discolored or where you see foam, scum or mats of algae on the water.
If you see a BGA bloom, ODEQ recommends that you avoid all contact with the water, keep your pets and livestock away from the water and immediately contact ODEQ at (800) 522 0206 or GRDA at (918) 256 0911.