ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins85% CONFIDENCEOverall confidence: 85%How well the pin's source and references back up its dates.Weighted average of how firmly 1 reference, the source included, supports the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
NPS[1] page opened 2026-10-18 (updated Sept 26, 2026); park is open year-round, lifeguarded beach season assumed late May-early Sept so a May-Oct window is estimated.Swim from Lake Michigan beaches, climb Mount Baldy and hike dune and wetland trails within an hour of the Loop.
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