⏵ Course guide · Columbia River Gorge fall race
Thunder River runs a lollipop-loop 50K and a point-to-point 25K along the Pacific Crest Trail and Gorge 400 trail in the Columbia River Gorge, crossing under the Bridge of the Gods into Cascade Locks before a finishing loop around Thunder Island. I will walk you through the course and format first, then give you a pacing and fueling plan for a fall Gorge closer. There are free calculators along the way to dial in your own numbers.
These facts come from the official Daybreak Racing event page. Check the current year details, cutoffs, and aid stations before you commit. Race logistics change year to year.
Both the 50K and 25K travel the Pacific Crest Trail and Gorge 400 trail before cruising under the Bridge of the Gods into the town of Cascade Locks, then finishing with a loop around Thunder Island.
The 50K is a lollipop loop, starting and finishing at Marine Park. The 25K is purely point-to-point, starting at Wyeth Trailhead after a shuttle ride and finishing back at Marine Park, so plan your day around a one-way trip if you choose the shorter distance.
Every distance shares the same signature finishing stretch: crossing under the historic Bridge of the Gods into Cascade Locks, then a trail loop around Thunder Island, surrounded by the Columbia River, before the finish at Marine Park's Pavilion.
Because the course crosses US Forest Service land, boot brush use is mandatory at check-in and the start line to prevent spreading invasive weed seeds. The Columbia River Gorge is famously turbulent year round, so treat any forecast as a starting point, not a guarantee.
Both distances finish under the same 4:30 PM cutoff despite starting at different times, so know your real window before you settle into a pace.
The 50K gets 8.5 hours from an 8:00 AM start. The 25K gets 6.5 hours from a 10:00 AM start. Both close at 4:30 PM, so a 25K runner who starts late or lingers at the shuttle loses real time off an already shorter window.
With no elevation gain figure available for either course, a grade-adjusted pace target built from the PCT and Gorge 400 trail description gives you a more honest number than guessing at a vert estimate. Use the early Pacific Crest Trail miles to calibrate your effort for the rest of the course.
⏵ Free tools to pace this course
Late October in the Columbia River Gorge can deliver a genuine range of fall weather, so plan your fueling and layering to flex rather than betting on a single forecast.
Aim for roughly 60 to 90 grams of carbohydrate per hour on the 50K, and sodium in the 300 to 700 mg per liter range. Full-service aid stations along the course, staffed with professional medical support and radio communications, mean you can reset your intake regularly rather than carrying everything at once.
The Columbia River Gorge is famously turbulent year round. Carry layers beyond what a calm forecast suggests, especially on the point-to-point 25K where you cannot easily return to a car if conditions turn.
⏵ Build your fueling plan
Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and a turbulent Gorge fall day with the free ultra fueling calculator. Browse the rest of the free running tools at the tools hub.
⏵ Train for it with Summit Line
Get a race-day plan built around YOUR fitness, this Columbia River Gorge terrain, and your projected splits. Summit Line reads your real training, builds a plan for PCT singletrack and Gorge weather, and rehearses your fueling so race day is something you execute, not guess at.
Daybreak Racing does not publish a total elevation gain figure for the 50K or 25K, but both courses run through the Columbia River Gorge, famously turbulent terrain year round, and end with a signature stretch along the Pacific Crest Trail and Gorge 400 trail before crossing under the Bridge of the Gods into Cascade Locks. The 50K's 8.5 hour cutoff and the 25K's 6.5 hour cutoff are both reasonable for a well-prepared trail runner, and neither distance is presented as an extreme test, more a scenic, well-supported fall closer.
A 50K lollipop loop starting and finishing at Marine Park in Cascade Locks, and a 25K that runs purely point-to-point, starting at Wyeth Trailhead after a shuttle ride from Marine Park and finishing back at the same Marine Park staging area.
Halloween in the Columbia River Gorge means genuine fall weather, and the Gorge is known for turning turbulent year round, so come prepared for a range of conditions. Aim for roughly 60 to 90 grams of carbohydrate per hour on the 50K, and sodium in the 300 to 700 mg per liter range. Build your numbers with the free ultra fueling calculator before race day.
The 50K has an 8.5 hour window, 8:00 AM to a 4:30 PM finish cutoff. The 25K has a 6.5 hour window, 10:00 AM to that same 4:30 PM cutoff. Both distances share the same finish-line cutoff time despite their staggered starts, so know exactly how much buffer your specific distance carries.
Both courses travel along the iconic Pacific Crest Trail and Gorge 400 trail before cruising under the Bridge of the Gods into the town of Cascade Locks. Every race concludes with a trail loop around Thunder Island, surrounded by the Columbia River, before finishing at Marine Park. Expect classic Gorge fall scenery and genuinely changeable weather, the Columbia River Gorge is famously turbulent year round, so pack layers regardless of the forecast.
The 50K is a reasonable first-ultra candidate given its lollipop-loop format (you return to the same staging area rather than committing to a fully remote point-to-point course) and its 8.5 hour cutoff. The 25K is a solid non-ultra option if you want the same Gorge scenery on a shorter, point-to-point day. Neither distance has a published vert figure, so lean on the generous cutoffs and the well-supported aid stations as your safety margin rather than assuming an easy course.
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<a href="https://runsummitline.com/guides/thunder-river">The Thunder River course guide</a>This guide is independent and for planning only. The course details, dates, cutoffs, and aid stations come from public sources and can change year to year, so confirm the current specifics with the official race before you register or run. The fueling and pacing advice is general and not medical advice.