Lago Dos Bocas
A reservoir among the karst hills served by free public launches, the only practical way to reach the houses and eating places on its arms.
Updated 29 October 2026

AI illustration
Dos Bocas was created by damming the Río Grande de Arecibo, with work begun in 1937 and the dam completed in 1942 for hydroelectric power, and it drowned the valley floor between steep karst hills so thoroughly that several communities on its arms have no road access at all. The government runs free public launches from the main dock, a ferry service rather than a tourist boat, calling at jetties around the lake on a set timetable; residents use it for the school run and the shopping. Visitors ride it for the scenery, green mogotes dropping straight into still water, and to reach the handful of family-run eating places on the shore that can only be arrived at by boat.
Background
Dos Bocas Lake is a reservoir on the Arecibo River, lying in the municipalities of Arecibo and Utuado on the island of Puerto Rico. Work on it began in 1937 and was finished in 1942, when the Puerto Rico Electric Power Authority completed the Dos Bocas Dam as part of a New Deal project, for use as a hydroelectric power plant. The lake also serves as one of the island's reservoirs of drinking water. In recent years silt has collected in it, reducing its capacity and making some areas impossible to reach by boat. Ferries run by the Department of Transportation of Puerto Rico carry residents and tourists on the lake, several restaurants and rental houses stand on its shore, and the Río Abajo State Forest is nearby.
Source: Wikipedia, "Dos Bocas Lake"
Highlights
- The public launch - a free scheduled ferry around the lake's arms.
- The karst shoreline - round limestone hills dropping into the water.
- The boat-access communities - houses with no road to them.
- The dam and main dock - the starting point off Route 10.
When to go
December to April is drier and the lake is at its clearest. The launches run to a published timetable with more sailings at weekends; check the schedule, since the last return is early. Mornings are calm and reflective on the water.
Good to know
This is a working ferry, not a cruise: no commentary, basic boats, and a timetable that governs the whole visit, with the last return in the afternoon. Eating places on the shore keep their own hours, mostly weekends, so a midweek trip may find nothing open. Water levels and quality vary and swimming is not the point here.
Nearby
Caguana ceremonial site is half an hour; the Camuy caves are west.
Key facts
Source: Wikidata, item Q6472216, read on 18 October 2026.
What to pack for Lago Dos Bocas
Chosen from what this place is for. Tap a kit for the full checklist.
- Reef-safe sunscreen - High SPF that will not bleach the coral you are swimming over. Find on Amazon
- Head torch + spare batteries - Hands-free light is essential; caves are truly dark. Find on Amazon
- Quick-dry towel - A microfibre towel packs small and dries in minutes. Find on Amazon
- Grippy closed shoes - Cave floors are wet, muddy and slick with formations. Find on Amazon
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Opening times, ticket prices and seasonal closures change - check the official source before you go: official site.




