The tests indicated that the bacteria is toxic and the city closed the ponds.

"The winter run-off, wet spring and low river flows are contributing factors to the bacteria," said Doug Holloway, superintendent of recreation services for Boise, in an email.

Holloway said in an email that the city is treating the toxic bacteria with increased river flows through Quinn’s pond and into the Esther's pond to try to decrease the magnitude of the bacteria. He said the city does not know when the ponds will reopen.

Quinn’s Pond and Veterans Pond remain open for swimming, wading and recreation as test results continue to show that they have not been affected by the cyanobacteria.