Big River Adventure
About this race
Welcome to the 26th annual Big River Adventure!
Join us for a unique race experience where you can choose your adventure to run, swim, walk, or paddle your way through the scenic beauty of Mendocino County's Big River.
For the past 26 years, Cancer Resource Centers of Mendocino County has been bringing our community together for this special fundraising event. While the activities may change from year to year, our mission remains steadfast: to honor and remember those impacted by cancer, and to raise vital funds to support free services for individuals facing cancer in Mendocino County.
Starting at the Big River boat launch, participants will embark on a journey filled with stunning views and the shared goal of making a difference in the lives of others.
Don't miss out on this unforgettable adventure! Register now and be part of something truly meaningful.
To keep this family-friendly event affordable and accessible to our community, we will not be providing t-shirts this year.
Here is a link to a trail map
• 5k runners will run east on the haul road to the 5k turn around.
• 10k runners dash east on the haul road to the 10K turn around (10K map).
• 5k "Fun" Walkers will follow the 5k runners route.
• Kiddie run will begin at the boat launch
• Swimmers will dive in at the boat lunch and swim east up Big River
• Paddlers will begin at the boat launch and paddle east up Big River *Please note you must bring your own vessel.
There are multiple race age divisions. Note: Participants between the ages of 6 and 17 may enter any race division at a discounted rate of $20 at signup.
Race Contact Info
Phone / Teléfono: (707) 937-3833
E-mail / Correo electrónico: info@crcmendocino.org
Pick your distance
Running
Kiddie Race
5K Run
10K Run
Walking
5K Fun Walk
Swimming
Big River Swim
Paddle sports
Big River Paddle
Participants must provide their own canoe/paddle board.
Typical race-day weather
Based on 3 years of Open-Meteo archive data for this event's race dates in Mendocino, plus the 3 days either side.
The sun rises at 5:55 AM and sets at 8:27 PM local time (PDT) in Mendocino on May 22, 2027 — 14h 32m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
Reviews
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Results — Big River Adventure
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 1 Mendocino event
Spotted something wrong? Tell us and we'll fix it.