 In the upper 80s, weather forecast details on the way. News and service of Alton Eye's Community Federal Credit Union. It's where you belong. We'll go to Moore Park and Alton will be closed until further notice after a sinkhole opened up at the turf fields near the entrance to the park on Wednesday morning. No one above or below ground was injured in the collapse, reportedly caused by surface subsidence, according to New Frontiers Materials that operates mining in that area of Alton.