The McNaughton Park Trail Runs, over distances of 50, 100, 150 and , is an annual ultramarathon running event held in Pekin, Illinois each spring on a rugged, ten-mile (16 km) loop course. All four races are run concurrently. The 150 and ultra are the only ones of that distance held in Illinois. The loop course is primarily a single lane footpath, through natural countryside including forests and meadows. Each ten-mile (16 km) loop provides approximately of elevation gain. A thirty-mile run, part of the event through 2006, was replaced by a option beginning in 2007. Records Men 30 Mile (no longer held): Paul Stofko 3:58:18 2005 50 Mile: Eric Grossman 6:52:34 2004 100 Mile: Karl Meltzer 17:40:13 2007 150 Mile: David Goggins 33:36:20 2008 Women 30 Mile (no longer held): Ellen Erhardt 4:35:34 2004 50 Mile: Jane Moser Cox 9:28:01 2005 100 Mile: Tracy Thomas 23:27:26 2006 150 Mile: Charlotte Vasarhelyi 46:21:29 2008 External links PotawatomiTrailRuns.com - Official web site Ultramarathons in the United States Track and field in Illinois