Mercer Island Half Marathon History & Pacific Northwest Running Resources

Welcome to the comprehensive resource celebrating the Mercer Island Rotary Half Marathon's rich 45+ year history while serving as the premier guide for Pacific Northwest running. This site honors the legacy of a beloved community event that raised millions for colon cancer awareness while providing modern runners with training guides, race information, and local running resources.

45+

Years of History

3,000+

Peak Participants

13.1

Miles of Excellence

$1M+

Raised for Charity

A Storied Pacific Northwest Running Tradition

Runners crossing the Mercer Island Half Marathon finish line with Lake Washington in background

Founded by the Mercer Island Rotary Club, the Mercer Island Half Marathon evolved from a small community race into one of the Seattle area's premier running events, attracting over 3,000 participants at its peak. The scenic Lake Washington course wound through the beautiful neighborhoods of Mercer Island, offering runners stunning waterfront views and a supportive community atmosphere.

What made this event truly special was its family-friendly nature, featuring multiple distances including the half marathon, 10K, 5K, and Kids Run. For more than four decades, this race brought together runners of all ages and abilities, from elite athletes chasing personal records to charity runners supporting important causes.

The race's impact on the local running community extended far beyond race day. It fostered connections, inspired thousands to pursue their running goals, and created lasting memories for participants and volunteers alike. Today, we honor that legacy while continuing to serve the Pacific Northwest running community.

Learn more: Rotary International | Road Runners Club of America

Susie's Legacy: Running for Colon Cancer Awareness

The Mercer Island Half Marathon became more than just a race—it became a powerful vehicle for colon cancer prevention and awareness through the Susie's Legacy fundraising initiative. Named in honor of Susie Chadwick, whose courageous battle with colon cancer inspired a decade of community fundraising, this initiative raised funds for screening programs, research, and prevention education.

Through Susie's Legacy, the running community came together to make a real difference. Thousands of participants ran with purpose beyond personal achievement, knowing that every mile contributed to saving lives through early detection and prevention. The initiative funded colon cancer screening programs, supported research, and raised awareness about the importance of preventive care.

Colon cancer is highly preventable when caught early through screening. Regular screening beginning at age 45 can detect polyps before they become cancerous. Physical activity, including running, reduces colon cancer risk by 30-40%. The legacy of this race continues through education and awareness, encouraging everyone to prioritize screening and maintain an active lifestyle.

Important resources: American Cancer Society | Colorectal Cancer Alliance

Runner wearing blue colon cancer awareness ribbon on race bib

Your Pacific Northwest Running Resource Hub

Aerial view of scenic running trail along Lake Washington waterfront on Mercer Island

While honoring the past, this site serves as your comprehensive resource for Pacific Northwest running. Whether you're training for your first 5K or your tenth half marathon, we provide the guidance and information you need to succeed.

Training Guides

Proven training plans for 5K, 10K, and half marathon distances. From beginner-friendly programs to advanced strategies, find the plan that fits your goals.

Start Training

Local Routes

Discover the best running routes on Mercer Island and throughout the Seattle Eastside. Scenic waterfront trails, challenging hills, and peaceful loops.

Explore Routes

Race Calendar

Stay updated on half marathons, 10Ks, 5Ks, and charity races throughout the Pacific Northwest. Plan your racing season year-round.

Find Races

Nutrition Tips

Master running nutrition with expert guidance on fueling, hydration strategies, and race day nutrition for optimal performance.

Learn More

Charity Running

Learn how to run for causes that matter, fundraising strategies, and join charity race teams making a difference through running.

Get Involved

Running Community

Find running clubs, group workouts, and community connections across Mercer Island, Seattle, and the greater Eastside area.

Join Community

Additional resources: USA Track & Field

Ready to Start Your Running Journey?

Whether you're a former Mercer Island Half Marathon participant or new to the Pacific Northwest running community, we're here to support your goals. Explore our comprehensive training resources, discover local routes, and connect with fellow runners.

View Training Plans Learn About Susie's Legacy

The Legacy of Mercer Island Half Marathon