A marathon from Nevada's oldest town to the top of Genoa Peak is planned for August.Organizer Kevin Bigley of Ascent Runs said he expects up to 250 trail runners to participate in the Genoa Peak Madathon scheduled for Aug. 10.Runners will start and finish at Genoa Park, which will require Nixon Street to be closed through the day. Bigley said they will take Jacks Valley Road north to Centennial then across to Eagle Ridge before they turn up the Genoa Discovery Trail.The marathon features a 3,000-foot climb over 7.5 miles to the top of Sierra Canyon before the race climbs …