The Arid (or desert) Dome at the Mitchell Park Domes has been temporarily closed after fallen concrete was discovered, according to a statement from Milwaukee County Park Director John Dargle and reported by local media.

Dargle's statement: "After discovering a piece of fallen concrete at the Arid Dome, the Parks Department consulted with Risk Management and an independent engineering firm to determine the best course of action to ensure the safety of our employees and the public. Per their recommendation, we have temporarily closed the Arid Dome until further safety evaluations and planning can be completed."

The tropical and floral domes remain open. The popular train exhibit is located in the floral dome.

In September, Milwaukee County planned to spend about $500,000 to "develop an overall repair strategy for the three aging domes," according to a Journal Sentinel report.

The county spent $200,000 in 2013 and 2014 to repair the deteriorated frame of the Tropical Dome.

The frame of each dome is made of steel-reinforced concrete supports, and concrete encases metal plates connecting the support.  

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