SAN JOSE, Calif. (KCBS) _ The city of San Jose is prohibiting water activity at Almaden Lake Park until further notice due to a harmful algae bloom.

Water quality officials recently found evidence of the bloom and City Park Ranger Dan Wallace said it is not an uncommon thing in the warm summer weather.

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“No idea about the time frame,” said Wallace. “We’re waiting to hear back from the water district to give us the heads up on when we’re going to be able to reopen again.”

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Those visiting the park are taking the closure in stride, with picnics and other outdoor activities.

“We’re going to have a good time. Always have a good time,” said one visitor. “The kids will play. They’ll run. Kids just like to be outside. Lake or no lake, we’re going to have fun.”

City of San Jose spokeswoman Mona Favorite-Hill said the blue-green bloom has been identified as Cyanobacteria, which can be harmful to humans.

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Park staff are expected to monitor and test the water as the bloom subsides.