Share: 5K Run Lake Sammamish State Park 5K Run Lake Sammamish State Park Share: Add to Calendar+ Google Calendar + iCal Export Date & Time Saturday, July 13, 2019 Additional Information 5K run/walk through Lake Sammamish State Park, benefiting Issaquah High School. Open to all, regardless of running experience and competitiveness. Registration from 7:00 am to 7:45 am, race from 8:00 am to 9:30 am.