Mines Of Spain 100 - Dubuque, IA

Located in Dubuque, Iowa, the Mines of Spain 100 offers 100 miles or 100 kilometers of trail running through the Mines of Spain Recreation Area along the Mississippi River valley. The ~20-mile loop combines steep, technical single-track with dirt and prairie, and occasional pavement. Runners complete five loops for the 100-mile and three loops for the 100-kilometer, totaling about 14,000 and 8,400 feet of elevation gain.

Expect views of the Mississippi, Horseshoe Bluff, prairies and hardwoods. The grassroots, meticulously organized event supports local trail groups; it's No Coast Trail Series and Trail Sisters Approved, with Mile 90 photography. Time limits: 33 hours (100-mile) and 23 hours (100k). Visit the organization's website for the most recent information.