Chicoasén Dam: The Grand Finale of Sumidero Canyon

The Chicoasén Dam rises 260 meters at the northern end of Sumidero Canyon, plugging the Grijalva River and creating the 25-kilometer reservoir that every canyon boat tour reaches before turning back. If you take the standard lancha trip from Chiapa de Corzo, you will likely spend about 15 minutes idling near the dam wall, close enough to see the concrete embankment that has backed up the river since 1981. That moment — when the canyon walls open slightly and the water stills — is the practical endpoint of the Sumidero experience.

Most people who visit the dam do so by boat rather than by road. The dam itself is not a standalone tourist attraction with a visitor center or guided facility tours. It is an active hydroelectric plant operated by the Comisión Federal de Electricidad (CFE), and public access is limited to the water and the distant viewpoints. What you get is a view of one of Mexico's largest hydraulic engineering works set against a backdrop of tropical forest and steep limestone.

How to See Chicoasén Dam

By Boat from Chiapa de Corzo or Cahuaré

The classic route starts at one of the four embarcaderos (docks) in Chiapa de Corzo — Malecón, Cahuaré, Unidad Deportiva, and Belisario Domínguez. Shared motorboats leave when full, typically between 8 a.m. and 4 p.m., and the round trip to the dam and back takes about two hours. You will pass the Christmas Tree waterfall, the Cueva del Silencio, and the Cueva de Colores before the dam comes into view. Fares vary by dock and season; expect to pay around 340 pesos for adults, with discounts for seniors holding an INAPAM card. Check locally — rates change and are sometimes posted only in Spanish.

By Car to the Viewpoints

The canyon viewpoints (miradores) on the road between Tuxtla Gutiérrez and Chiapa de Corzo offer high-altitude views of the river and, in the distance, the reservoir that feeds the dam. The miradores are open daily except Tuesdays, when park staff rest. From the Los Chiapa viewpoint, you can see the canyon's mouth but not the dam wall itself. The dam is best appreciated from the water; the viewpoints give you the scale of the watershed it controls.

I would not drive to the dam expecting a close-up. The access road is gated and unmarked for tourists, and there is no parking area designed for visitors. The boat is the practical way in.

Combining the Dam with Chiapa de Corzo

Many tours pair the boat ride with a stop in Chiapa de Corzo's colonial center. The town's Mudéjar-style fountain and Santo Domingo church are worth an hour, and the boat docks are a short walk or drive from the plaza. If you are driving yourself, park near the Malecón and walk to the embarcadero — this saves the hassle of finding parking near the docks, which fill up by mid-morning in high season.

Practical Details for Visitors

The dam sits within Sumidero Canyon National Park, which was declared a protected area in 1980 and covers 21,789 hectares across five municipalities. Park entrance is included in most boat tour prices, but if you arrive independently, there is a small fee at the park gate — usually under 50 pesos. The national park is open year-round, though boat schedules can be affected by water levels and weather. The dry season, November through April, brings calmer water and clearer skies. The rainy months, May through October, swell the river and sometimes suspend boat operations for safety.

Life jackets are provided on all boats, and you should wear one. The open lanchas have no shade, so bring a hat, sunglasses, and biodegradable sunscreen — the sun reflects off the water and the canyon walls. A dry bag for your phone or camera is smart; spray from the bow can soak you within minutes. I learned that the hard way on a breezy January morning, and my phone survived only because I had zipped it into a plastic pouch.

If you are prone to motion sickness, sit toward the back of the boat, where the ride is less jarring. The trip is not strenuous, but the boat can bounce over wakes from other lanchas. The two-hour duration includes a stop near the dam, where the boat idles and the guide points out the intake towers and the embankment. You will not disembark at the dam itself — there is no public dock there.

Frequently Asked Questions

Can you visit Chicoasén Dam without a boat tour?

No, not to the dam wall. The dam is an active CFE facility with restricted access. Your only options are the boat tour that reaches the dam's base or the distant viewpoints along the canyon rim. The boat is the only way to get close.

How long does it take to reach the dam from Chiapa de Corzo?

About 45 minutes to an hour by boat, depending on the current and how many wildlife stops the captain makes. The return trip is usually faster because the boat runs with the current. Total round trip is roughly two hours, including the pause near the dam.

Is the dam accessible year-round?

Yes, but boat operations can be suspended during heavy rain or when the river is running high. The dry season, November to April, is the most reliable window. If you visit in September or October, call the embarcadero in the morning to confirm departures.

What is the best time of day to see the dam?

Morning departures, between 8 and 10 a.m., offer the calmest water and the softest light on the canyon walls. Afternoon trips can be windy, and the sun is directly overhead, making photography harder. The dam face is in partial shadow in the morning, which actually helps you see the structure's details.

Do I need a guide to visit the dam?

No. The boat captains serve as informal guides, pointing out features and wildlife. If you want more context on the hydroelectric plant's history and capacity, read up before you go — there is no official interpretive signage at the dam site.