WISCONSIN ANVIL ULTRA TRIATHLON
September 7 - 14, 2025 • Dousman, Wisconsin
Ottawa Lake State Park
~ 5x / 3x / 2x / 1.5x / 1x ANVIL ~
RACE CATEGORIES
Solo Continuous Anvil Triathlon
Traditional Swim, Bike, Run Format.
- 5x ($2,750) | 132 hour time limit.
12 mile swim, 560 mile bike, 131 mile run
- 3x ($1,500) | 60 hour time limit.
7.2 mile swim, 336 mile bike, 78.6 mile run
- 2x ($1,200) | 36 hour time limit.
4.8 mile swim, 224 mile bike, 52.4 mile run
- 1.5x ($1,200) | 17 hour time limit.
3.6 mile swim, 168 mile bike, 39.3 mile run
- 1x ($850) | 17 hour time limit.
2.4 mile swim, 112 mile bike, 26.2 mile run
Solo 1 Per Day Anvil Triathlon
1 Full Distance Triathlon Per Day Format.
- 1x5 ($2,750) | 24 hour time limit per day.
- 1x3 ($1,500) | 24 hour time limit per day.
Relay Continuous Anvil Triathlon
Relay Team (2 - 3 Athletes Per Team)
- 5x ($1,500 per person) | 132 hour time limit.
12 mile swim, 560 mile bike, 131 mile run
- 3x ($1,000 per person) | 60 hour time limit.
7.2 mile swim, 336 mile bike, 78.6 mile run
- 2x ($750 per person) | 36 hour time limit.
4.8 mile swim, 224 mile bike, 52.4 mile run
Solo Continuous Aquavelo
Swim, Bike Format.
- 5x ($2,750) | 84 hour time limit.
12 mile swim, 560 mile bike
- 3x ($1,500) | 42 hour time limit.
7.2 mile swim, 336 mile bike
- 2x ($1,200) | 26 hour time limit.
4.8 mile swim, 224 mile bike
Solo Continuous Duathlon
Bike, Run Format.
- 5x ($2,750) | 126 hour time limit.
560 mile bike, 131 mile run
- 3x ($1,500) | 57 hour time limit.
336 mile bike, 78.6 mile run
- 2x ($1,200) | 34 hour time limit.
224 mile bike, 52.4 mile run
REGISTRATION
All race registrations are completed online. We do not accept paper forms, do not offer race day registrations and do not accept payment from other services like PayPal or Venmo. You may register online by clicking here.
All athletes (solo and team members) are required to have our Medical Release Form signed by a licensed doctor. This form must be submitted to our race director via email one month prior to the race start.
Athletes may download the Medical Release Form here.
This event is produced by Mammoth Endurance, the leaders in ultra triathlon racing in the United States. Our Mission at Mammoth is to organize the highest quality and most thoughtful ultra triathlons in the world. We're a small, family owned and operated business with over 30 years of experience producing endurance events around the country.
You can use these links to meet our team or read about our company values.
Make sure you check out The Mammoth Podcast to find inspiration to keep working hard towards your goals.
This race is sanctioned by USAT (United States Triathlon Association). All athletes are required to belong to USAT, either with a yearly membership or by purchasing a one-time “day use” license. If you do not hold a USAT membership you will be given the opportunity to purchase a one day pass during the online registration process.
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Visit www.usatriathlon.org for additional details and to learn more about the United States Triathlon Association.
THIS IS ANVIL
Since 1985. Home Of The Original Ultra-Triathlon.
ATHLETE GUIDE
Our athlete guide contains everything you will need to know for your event. We make this guide available to you at all times so you can plan ahead and be as prepared as possible for you event. It is the athletes responsibility to read the athlete guide in its entirety and familiarize yourself with the rules, courses, schedule and other details pertaining to the event.
We will call each athlete in the weeks leading up to the race to say hi and touch base on any questions you may have!
YOU CAN DOWNLOAD THE 2024 ATHLETE GUIDE HERE
It is the athletes responsibility to read the athlete guide in its entirety and familiarize yourself with the rules, courses, schedule and other details pertaining to the event.
SCHEDULE OF EVENTS
Sunday - September 7, 2025
10:00am - 12:00pm • 1x5, 5x athlete check-in.
12:30pm - 1:30pm • 1x5, 5x athlete meeting & lunch.
Monday - September 8, 2025
6:30am • Athlete roll call (swim area)
6:50am • U.S.A. National Anthem.
7:00am • 1x5, 5x (day 1) race start.
Tuesday - September 9, 2025
6:55am • 1x5 athlete roll call.
7:00am • 1x5 (day 2) race start.
Wednesday - September 10, 2025
6:55am • 1x5 athlete roll call.
7:00am • 1x5 (day 3) race start.
10:00am - 12:00pm • 3x, 2x, 1.5x athlete check-in.
12:30pm - 1:30pm • 3x, 2x, 1.5x athlete meeting & lunch.
Thursday - September 11, 2025
6:30am • 1x5, 3x, 2x, 1.5x athlete roll call.
6:50am • U.S.A. National Anthem.
7:00am • 1x5 (day 4), 3x, 2x, 1.5x race start.
12:00pm • 1.5x, 2x continuous swim cutoff.
3:00pm • 3x continuous swim cutoff.
8:00pm • 1x continuous bike cutoff.
Friday - September 12, 2025
6:55am • 1x5 athlete roll call.
7:00am • 1x5 (day 5) race start.
9:00am • 2x continuous bike cutoff
7:00pm • 2x continuous run cutoff.
Saturday - September 13, 2025
1:00am • 3x continuous bike cutoff.​
7:00am • 1x5 (day 5) race cutoff.
7:00pm • 5x, 3x continuous race cutoff.
Sunday - September 14, 2025
10:30am • 2nd annual ANVIL Beer Mile race start
11:00am - 2:30pm • Awards Ceremony & Lunch.
Breakfast is served every other day at 6:45am
Lunch is served daily at 12:30pm
Dinner is served daily at 5:30pm
Late Snacks are served every other day at 10:00pm
@MAMMOTHENDURANCE
COURSE INFORMATION
Our courses consist of shorter loops. The distance of our events require extra safety measures be taken to ensure athletes are cared for and able to receive medical help if needed while on course. These shorter loops allow for your family or crew to be much more involved in your race, resulting in an overall more enjoyable experience for athletes and their support crew.
The courses are well marked / manned by volunteers during the event. Try it before you bash it - we guarantee you'll find the shorter loops helpful and more enjoyable during your event.
SWIM COURSE DETAILS
5x: 60 loops / Triple: 36 loops / Double: 24 loops / 1.5x: 18 loops
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The Swim course is a 0.20 mile loop (1056 feet/322 meters). We will be swimming in an open water, non-motorized lake for all race categories. Athletes will call out their race number to our timers on the beach in between each lap. Multiple floating stations will be available to athletes allowing you to leave hydration and food for easy access during the swim.
Each athlete will be given, and is required to wear, a swim cap to wear during the swim. To be used, worn throughout the swim.
Lifeguards and volunteer kayakers will be present on the water throughout the entirety of the swim.
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The water temperature at this time of year is typically a comfortable 70 - 72 degrees Fahrenheit. The lake water is mostly clear with a sandy bottom. You'll see fish and turtles under water during your swim. There are some weeds on the north side of the lake but our swim course stays south, closest to the beach, avoiding the weedy areas of the lake.
BIKE COURSE DETAILS
5x: 100 loops / Triple: 60 loops / Double: 40 loops / 1.5x: 30 loops
The bike course is an open road, out and back course on newly paved roads. The course is designed to be easy on the athlete with minimal hills and a very smooth road surface to ride on. At the end of the course, riders will make a 180-degree turn to make their way back to the race village. Volunteers will be present on course throughout the entirety of the event. We will have a restroom available at the bike turnaround.
All riders are required to have a white headlight and red rear light on their bike while riding in the overnight hours.
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The bike course is on open roads meaning you will encounter light vehicle traffic. Signage will be placed along the roadway to notify motorists of the event.
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The bike segment is a 5.58 mile (8.890 kilometer) out and back. You will start the bike in the village area.
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We have calibrated the course with the same measuring equipment used by the Olympic committee (it is called a Jones Counter) so we are accurate on the mileage. Remember, GPS data from your watch, with long distances and multiple loops, will often be incorrect over time. Our courses are carefully marked and measured. Do not rely on your satellite GPS watch as an accurate measurement.
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1.5x athletes will complete one short loop (0.60 miles) before completing 30 full loops. 2x athletes will complete one short loop (0.80 miles) before completing 40 full loops. 3x athletes will complete one short loop (1.2 miles) before completing 60 full loops. 4x athletes will complete one short loop (1.6 miles) before completing 80 full loops. 5x athletes will complete one short look (2.0 miles) before completing 100 full loops.
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Road bikes must be in good working order. Remember to inspect your bikes before the race so you do not have any mechanical surprises on the bike course. You may use more than one bike during the race.
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You must wear an ANSI/Snell approved bike helmet during the bike course and have it buckled at all times when touching your bike. YOU MAY NOT DRAFT during this event. While on the bike segment, cyclists shall not work together to improve performance, efficiency, or position by teamwork or other joint conduct. All cyclists must assume and maintain a staggered riding position relative to the cyclists directly ahead. A variable time penalty shall be imposed for any violation of this. You may stop or walk your bike, but no time adjustments will be made.
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We will have course signage out notifying motorists of the event. At the end of the day, cars are bigger than bikes so please stay alert and be aware of your surroundings.
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No headphones are allowed. While you may carry a phone, you cannot use it as a communication device.
RUN COURSE DETAILS
5x: 130 loops / Triple: 78 loops / Double: 52 loops / 1.5x: 39 loops
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The run segment takes place on asphalt road. The run course is a 1.00769 mile (1.621719 kilometer) loop course.
The paved run course is designed specifically to give your crew three easy points of access per loop to you to help with fueling when needed. The course stays inside the park and campground at all times. There are multiple bathroom opportunities along the course. The run course is somewhat exposed so be prepared for all weather conditions.You must use a flashlight/head light for the run section once it gets dark as well as a flashing red light on your back for greater visibility.
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Crew is not allowed to be on course for support. All support must be done within the village. You may stop and rest at any time along the course, but the race clock is still in motion. Athletes may not receive any assistance in the form of transportation. You may not have your support crew pace you during the run. You may, on your last run lap, invite your friends and family to run with you.
The ANVIL Village
Your Home Base During The Event.
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Each athlete will be assigned a "pit area" inside our ANVIL village. This pit area is where you will store belongings during the event and from where your crew will support you. The bike and run course go directly through the village every lap, giving you easy access to your supplies / food and crew. Our food tent, aid station and charging station are located directly in the middle of the village. The food tent is where athletes and crew can eat home cooked breakfast, lunch, dinner and a late night snack. Athletes have access to the food tent included with their registration. Crew must purchase food tickets in order to eat from our food tent during the race. The charging tent is to be used for charging phones, lights, etc... We do not provide phone cords but will have power strips available for you to plug in and charge your devices.
You may rent a tent space from Mammoth or bring your own 10x10 tent. You may bring your own chairs, coolers, food, equipment, etc.. We ask that there are no open flames inside your pit area. If bringing your own tent - you must have adequate weights to hold down the tent in case we experience any type of wind. Tent walls are also recommend to help protect you and your gear from the elements. We provide lights throughout the entire village area and will string blue or white LED top lights in your tent once you are setup and ready. You may also bring your own lights if you choose.
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Renting a tent space for Mammoth:
During registration, you'll have the choice to rent a shelter from us. This is a 10x8 space and includes one 8 ft table and two folding chairs. We have a limited supply of space available so please make sure you register early and add-on a shelter when registering.