The World's Toughest Outboard Marathon
Top O' Michigan Outboard Racing Club
Outboard Marathon Nationals: Racing August 9-10, 2025
Inland Waterway, Northern Michigan
Join the Top O’ Michigan Outboard Racing Club (TOMORC) this August for the 77th Annual Marathon. Over two days of exciting and tough outboard racing in Northern Michigan. The course navigates through 87 miles of Northern Michigan’s beautiful Inland Waterway.
Registration will be Friday, August 8th, from 5:00 to 7:00 PM at Devoe Beach in Indian River.
Register also on Saturday, from 8:00 to 9:00 AM at the race pits.
View 2024 BrochureThe 2025 Race
Results & Champs
We celebrate past Top O’ Michigan Outboard Racing Club winners and participants! Marathon racing is a way of life!
Event Sponsors
The Top O’ Michigan Outboard Racing Club would like to thank everyone who helps in making this race successful every year!
Join & Volunteer
Become an active member of the Top O’ Michigan Outboard Racing Club or volunteer for this year's race - we'd love to have you!
Participating
100+
Speeds of
55MPH +
Miles Traveled
80+
Cheering Spectators
5000+
Top O' Michigan Outboard Racing Club
2025 Marathon Nationals
The Top O’ Michigan Outboard Marathon National Championship race is celebrating its 77th anniversary in 2025! Founded in 1949, the race which is known as the world’s toughest outboard marathon, has grown to legendary status in the boat racing world.
For more than 70 years, boat racers from across the United States, as well as other countries, have been coming to northern Michigan to race across the rivers and lakes of the Inland Water Route in an adventure that tests both drivers and their boats.
