A canyon adventure park on the Potrerillos reservoir in the Sierra Fria with 13 hanging bridges strung across the gorge, two zip-lines of 90 m and 120 m, rappel walls and via ferrata sections. The site connects to Presa Calles through a three-kilometre masonry tunnel.
The Parque de Aventura Boca de Túnel sits on the Presa Potrerillos in the Sierra Fría, in the San José de Gracia municipality of northern Aguascalientes, Mexico, about 75 kilometres and an hour and a quarter by car from Aguascalientes city. The park takes its name from the three-kilometre masonry tunnel that channels water from the Presa Plutarco Elías Calles into the Potrerillos basin, and the adventure circuit is built around the canyon that tunnel feeds. Its core elements are thirteen hanging bridges strung at varying heights across the gorge, two zip lines of 90 and 120 metres crossing the water, rappel walls on the canyon sides and cable-protected via ferrata sections. Visits run from a half day to a full day depending on how many elements are added.
The circuit needs no technical experience, but it does demand a tolerance for heights and enough grip and balance to manage swaying bridge decks and short ladder sections. Parks of this kind in the state typically admit children from around age 8 on the bridges, with rappelling and via ferrata reserved for older participants, and the harness systems suit a weight range of roughly 30 to 110 kilograms. Vertigo, heart conditions, recent surgery and pregnancy are standard exclusions from the aerial elements.
Harnesses, helmets, lanyards and zip-line pulleys are issued and fitted at the entrance. Visitors bring closed-toe shoes with grip, long shorts or trousers so the leg loops do not chafe, water, sun protection and cash, since card payment at the park is unreliable. The park is a locally operated concession rather than an internationally certified adventure centre, so participants should watch the harness fitting, confirm carabiners lock and follow the Spanish-language briefing, which covers the clipping sequence, the one-person-per-span rule and zip-line braking. Staff are stationed along the circuit and can reach any bridge on foot within minutes; a serious incident would mean vehicle evacuation on the access road to San José de Gracia, with hospital care in Rincón de Romos or Aguascalientes city.
The park operates year-round, but October to April is the reliable window, with clear skies and mild days over the reservoir. Summer afternoons bring heat and thunderstorms, and all cable activity is suspended in lightning or high wind. Packages run about MXN 250-600 per person depending on how many elements are included.
Activity facts
- Where
- Presa Potrerillos, Municipio de San Jose de Gracia, Aguascalientes
- Duration
- Half day to full day
Equipment
- Closed-toe shoes with grip
- Long shorts or trousers for harnesses
- Water and sun protection
- Cash, as card payment is unreliable at the park
Location
Parque de Aventura Boca de Tunel, Presa Potrerillos, San Jose de Gracia, Aguascalientes, Ags., Mexico
22.1489, -102.4283 View on map
Highlights
- Thirteen hanging bridges spanning the gorge above the Presa Potrerillos
- Two zip lines of 90 and 120 metres crossing the reservoir canyon
- Rappel walls and cable-protected via ferrata sections on the canyon sides
- A three-kilometre masonry tunnel linking the site to the Presa Calles basin
- Sierra Fría setting an hour and a quarter north of Aguascalientes city
Tips for visiting
- Bring cash in pesos: card payment at the park is unreliable and there is no ATM nearby.
- Arrive in the morning, both to complete the full circuit unhurried and to avoid the afternoon storms that suspend cable activity from June to September.
- Wear long shorts or trousers under the harness; bare legs chafe on the rappel and via ferrata sections.
- Reserve ahead for Semana Santa and December holidays, when the park fills with domestic visitors.
- Secure any camera on a wrist strap or helmet mount, as handheld phones are not allowed on the bridges.
- Fill the tank before leaving San José de Gracia, since the final approach road has no services.
Frequently asked questions
How long does the Boca de Túnel circuit take?
A half day covers the bridges and zip lines comfortably. Adding rappelling, via ferrata and time at the reservoir turns it into a full-day outing.
What does entry cost?
Roughly MXN 250-600 per person depending on the activity package. Cash in pesos is the safest way to pay, as the park's card terminal is unreliable.
How do visitors get there from Aguascalientes city?
It is about 75 km north, roughly an hour and fifteen minutes by car via San José de Gracia. There is no practical public transport to the park itself, so a car or a booked tour is needed.
Is prior climbing experience required?
No. The bridges, zip lines and via ferrata are all cable-protected and staff fit the equipment, so a head for heights and basic mobility are the real requirements.