2025 Bluewater International Gran Fondo

Mammoth TUFF

September 12 - September 14 2025
Mammoth Lakes California USA
Date Confirmed
 
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Distances: 45, 70, 100 miles
Difficulty: Extreme terrain with frequent steep hills and long sustained climb
Limited to: 1000 Participants

Mammoth TUFF is an adventure through the hills of the Eastern Sierra. From the iconic town of Mammoth Lakes and rolling through the TUFF terrain of the Long Valley Caldera.

Tuff (tuf) is a general term for all consolidated pyroclastic, volcanic rocks.

The name, Mammoth TUFF, is a nod to the Long Valley Caldera and the volcanic stone that defines ‘gravel’ in the area. The caldera was formed about 760,000 years ago in a volcanic eruption from which the magma still underlies it, heating underground water and fueling hot springs the event will ride by. The short course is around 45 miles with 2,000 feet of climbing and will circle the famous caldera. The long course is around 100 miles with 8,000 feet of elevation gain and travels through the Volcanic Tableland formed by the Long Valley Caldera. Prepare to be transported back in time on an old stagecoach route used by miners and even further back past Native American petroglyphs left by ancestors of the Paiute-Shoshone tribe.

Our great country has taken liberty to protect the public lands throughout the Eastern Sierra and preserve the vast playground for future generations of explorers, naturalists, and visitors. Because of this, 10% of the entry fee will go directly back to the land. As riders wind through wide open roads on seemingly forgotten land, they will take pride in knowing they are giving back to the U.S. Forest Service and Bureau of Land Management. “This land is our land,” after all.

Mammoth TUFF

 
Start Located At: Mammoth Lakes, California
 
 
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Included

Join us on Friday for official pre-rides, registration, and the beer run thoughtfully named the Mammoth BUFF. Registration for the BUFF is HERE.

Stick around for free coffee at our Awards Ceremony and the biggest gravel event raffle in the world on Sunday morning. 

Prize / Race Categories

PLENTY OF PRIZES AND AMAZING RAFFLE!

 
Facilities
Toilets
Pre-Packet Pickups
 
Support for Participants
First Aid
Emergency Contact No
SAG Wagon
Outriders
Marshalls
Escort / Police Escort
Mechanical Support at Rest Stops
 
Community
Bike Festival
Raffle
After Party
Fundraising
 
Features
Course Timing
Category / Race Prizes
Finishing Medals
Results Within 24 Hours
Photos
Downloadable GPS files
Post Ride Shower
Finish Line Chute
 
Nutrition
Feed / Aid Stations
Post Event Meal(s) Provided As Part of Entry
Number of Aid Stations: 5
 
tuff
Feb 19 2020 - NEWS: Inaugural Mammoth Tuff Gravel Race Set for Mammoth Lakes, CA on September 19, 2020
Aug 01 2025 - EVENT: Rough Stuff Rally
Sep 12 2025 - EVENT: Mammoth TUFF
 
ucigravelws
Jun 29 2025 - NEWS: Wright and Seewald Take Victory at 2025 UCI Gravel Suisse
Jun 22 2025 - NEWS: Kloser and Loman Claim Victory at the Inaugural UCI Eislek Gravel
Jun 15 2025 - NEWS: France Prevails as Prevot and Drechou Take UCI Wish One Millau Gran Causses Titles
Jun 15 2025 - NEWS: Hunter Smith and Malezsewski Tough out UCI Safari Gravel Race in Kenya
Jun 14 2025 - NEWS: Hartog and Schmidt Claim UCI Gravel Challenge Blaavandshuk Titles in Denmark
Jun 12 2025 - NEWS: Tom Pidcock Plans to Compete at UCI Gravel World Championships This October
Jun 08 2025 - NEWS: Nilsson and Toupalik battle horrendous conditions to win UCI Gravel Adventure
Jun 04 2025 - NEWS: South Limburg will host the 2025 Bolero UCI Gravel World Championships
Jun 05 2025 - NEWS: Vos and Vandeputte Take Victory at UCI 3RIDES Gravel Race in Germany
May 17 2025 - NEWS: Cromwell and O’Brien Claim Victory at UCI SEVEN Gravel
May 11 2025 - NEWS: Wiebes and Wellens Triumph at UCI Marly Grav Race
May 10 2025 - NEWS: Johnston and Appleton Claim Victory at UCI Devils Cardigan
May 04 2025 - NEWS: Rossouw and Stehli Fastest at UCI Ceder Gravel
Apr 28 2025 - NEWS: Cyclists from around the world join UCI Paris to Ancaster challenge
Apr 26 2025 - NEWS: Anthony and Taylor Dominate at UCI Highlands Gravel Classic
Jul 12 2025 - EVENT: Gravel One Fifty
Aug 16 2025 - EVENT: Gravel Grit n Grind
Aug 23 2025 - EVENT: Khomas100
Aug 23 2025 - EVENT: La Monsterrando
Aug 30 2025 - EVENT: Houffa Gravel
Sep 06 2025 - EVENT: Specialized Gravel Series Limburg
Sep 06 2025 - EVENT: UCI Graean Cymru
Sep 12 2025 - EVENT: Mammoth TUFF
Sep 20 2025 - EVENT: UCI Sea Otter Europe Girona
Oct 11 2025 - EVENT: 2025 UCI Gravel World Championships
Oct 25 2025 - EVENT: Gravelista
Nov 09 2025 - EVENT: Alentejo Gravel
May 15 2026 - EVENT: UCI Gralloch Gravel
 
ucigravelws
Jun 29 2025 - NEWS: Wright and Seewald Take Victory at 2025 UCI Gravel Suisse
Jun 22 2025 - NEWS: Kloser and Loman Claim Victory at the Inaugural UCI Eislek Gravel
Jun 15 2025 - NEWS: France Prevails as Prevot and Drechou Take UCI Wish One Millau Gran Causses Titles
Jun 15 2025 - NEWS: Hunter Smith and Malezsewski Tough out UCI Safari Gravel Race in Kenya
Jun 14 2025 - NEWS: Hartog and Schmidt Claim UCI Gravel Challenge Blaavandshuk Titles in Denmark
Jun 12 2025 - NEWS: Tom Pidcock Plans to Compete at UCI Gravel World Championships This October
Jun 08 2025 - NEWS: Nilsson and Toupalik battle horrendous conditions to win UCI Gravel Adventure
Jun 04 2025 - NEWS: South Limburg will host the 2025 Bolero UCI Gravel World Championships
Jun 05 2025 - NEWS: Vos and Vandeputte Take Victory at UCI 3RIDES Gravel Race in Germany
May 17 2025 - NEWS: Cromwell and O’Brien Claim Victory at UCI SEVEN Gravel
May 11 2025 - NEWS: Wiebes and Wellens Triumph at UCI Marly Grav Race
May 10 2025 - NEWS: Johnston and Appleton Claim Victory at UCI Devils Cardigan
May 04 2025 - NEWS: Rossouw and Stehli Fastest at UCI Ceder Gravel
Apr 28 2025 - NEWS: Cyclists from around the world join UCI Paris to Ancaster challenge
Apr 26 2025 - NEWS: Anthony and Taylor Dominate at UCI Highlands Gravel Classic
Jul 12 2025 - EVENT: Gravel One Fifty
Aug 16 2025 - EVENT: Gravel Grit n Grind
Aug 23 2025 - EVENT: Khomas100
Aug 23 2025 - EVENT: La Monsterrando
Aug 30 2025 - EVENT: Houffa Gravel
Sep 06 2025 - EVENT: Specialized Gravel Series Limburg
Sep 06 2025 - EVENT: UCI Graean Cymru
Sep 12 2025 - EVENT: Mammoth TUFF
Sep 20 2025 - EVENT: UCI Sea Otter Europe Girona
Oct 11 2025 - EVENT: 2025 UCI Gravel World Championships
Oct 25 2025 - EVENT: Gravelista
Nov 09 2025 - EVENT: Alentejo Gravel
May 15 2026 - EVENT: UCI Gralloch Gravel