⏵ Course guide · Lake Bistineau, Louisiana
El Diablo Hundo repeats a flat, 10-mile loop through the Blue Wing, Koasati, and Whoa Mule trails at Lake Bistineau State Park in Doyline, Louisiana, aid every 5 miles and a generous 40-hour cutoff for the 100 Miler. I will walk you through the loop and aid setup first, then give you a pacing and fueling plan built for repeated flat Louisiana miles, plus free tools to dial in your own numbers.
These facts come from the official UltraSignup registration page. Check the current year details and cutoffs before you commit; race logistics can change year to year.
Every distance runs the same 10-mile loop combining the Blue Wing, Koasati, and Whoa Mule trails at Lake Bistineau State Park: flat, minimally elevated terrain with muddy sections, tree roots, and natural surfaces.
The main station at the start/finish offers hot food and a variety of trail snacks, and an unmanned station around the halfway point (roughly mile 5) carries water, snacks, ice, and electrolytes. For the 100 Miler, that means twenty total aid touches across ten loops, a genuine advantage for consistent fueling.
Do not mistake "flat" for "easy footing." The course description flags muddy sections and tree roots on natural trail surfaces, so while you will not be climbing, you still need to watch your footing, especially by the later loops of the longer distances.
With a 40-hour cutoff for the 100 Miler and 100K, the race gives you generous margin, but that only helps if you pace evenly across every 10-mile loop rather than blowing up early.
Flat courses tempt runners to go out too fast because the terrain feels easy. A race-time calculator can help you set a sustainable per-loop pace for the full distance, and an even effort across every 10-mile loop protects your legs and your fueling schedule far better than an aggressive first few laps.
⏵ Free tools to pace this course
Early October in northwest Louisiana can still run warm and humid during the day, with cooler overnight temperatures for 100-mile and 100K runners on course past dark.
Aim for roughly 60 to 90 grams of carbohydrate per hour, and keep sodium in the 300 to 700 mg per liter range, leaning higher during warm, humid daylight hours. With aid every 5 miles on every loop, use that frequency to keep your intake consistent rather than carrying more than you need between stops.
⏵ Build your fueling plan
Get a carb, sodium, fluid, and caffeine plan per hour built for your weight and your goal time 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 repeated Lake Bistineau loop, and your projected splits. Summit Line reads your real training, builds a plan for flat, humid repeated-loop distance, and rehearses your fueling so race day is something you execute, not guess at.
El Diablo Hundo repeats a 10-mile loop at Lake Bistineau State Park in Doyline, Louisiana, combining the Blue Wing, Koasati, and Whoa Mule trails on flat, minimally elevated terrain with muddy sections and tree roots. Race organizers describe it as "designed for you to finish," with a generous 40-hour cutoff for the 100 Miler and 100K. This is a friendly, loop-format ultra without technical or elevation difficulty, the real challenge is Louisiana humidity, mud, and the mental grind of repeating the same 10-mile loop up to 10 times for the 100 Miler.
The 100 Miler covers ten 10-mile loops of the Blue Wing, Koasati, and Whoa Mule trail combination. The 100K covers roughly six loops, the 50 Miler five, and the 25K about two and a half. Because every loop returns you to the start/finish aid station, you get frequent access to drop bags and crew regardless of which distance you choose.
Every loop passes two aid stations: the main station at the start/finish, offering hot food and a variety of trail snacks, and a second, unmanned station around the halfway point (roughly mile 5) with water, snacks, ice, and electrolytes. Ten loops for the 100 Miler means twenty total aid touches over the race, a real advantage for staying consistently fueled.
Early October in northwest Louisiana can still run warm and humid during the day, with cooler nights for 100-mile and 100K runners on course overnight. Aim for roughly 60 to 90 grams of carbohydrate per hour, and keep sodium in the 300 to 700 mg per liter range, leaning higher if the day runs hot and humid. With aid every 5 miles, use that frequency to stay consistent rather than carrying extra weight for the short gaps between stations. Build your numbers with the free ultra fueling calculator before race day.
The flat, non-technical loop terrain, frequent aid every 5 miles, and a generous 40-hour cutoff for the 100 Miler and 100K make this one of the more approachable 100-mile courses around, exactly what the race's own description means by "designed for you to finish." A well-prepared first-time 100-mile runner who can handle the mental repetition of ten laps and Louisiana heat and humidity has real room to earn a finisher buckle here.
Link this guide
Race directors and clubs: link or embed this guide anywhere. It stays current.
<a href="https://runsummitline.com/guides/el-diablo-hundo">The El Diablo Hundo course guide</a><iframe src="https://runsummitline.com/embed/race/el-diablo-hundo" style="width:100%;max-width:420px;height:180px;border:0;" loading="lazy" title="El Diablo Hundo course guide by Summit Line"></iframe>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.