Starved Rock State Park sees more than two-million visitors a year. It’s especially busy on holiday weekends. Flood water reached its parking lots and is limiting the number of available spots, which means the park could quickly reach capacity this weekend and close to additional visitors. Tim Schweizer, with the Department of Natural Resources, urges people visiting the park to arrive early. "If their plan is to get there late in the morning or early in the afternoon, chances are the park will be closed to additional visitors because parking will be unavailable," Schweizer said. He also warns holiday visitors to stay on the trails so they don’t face injuries. "If conditions are wet, the sandstone -- that is a predominant feature at Starved Rock -- becomes very slippery," Schweizer said. The park will give updates on closures through Facebook and Twitter at Illinois DNR.