Cambalache State Forest Radio Tower Road
Karst country radio tower ruins through dry forest
The old service road to Cambalache’s radio tower cuts through 1,000 acres of the island’s most unique dry forest ecosystem, where centuries of limestone erosion created a moonscape of sinkholes and underground rivers. The rutted track climbs 800 feet through mogote hills and past Cueva de los Murciélagos before reaching the abandoned tower complex that once served as a Hurricane Hugo evacuation center. Locals still call it “La Torre del Diablo” after the eerie radio static that echoed through the forest for decades.
This is moderate terrain requiring high-clearance 4WD and skid plates — sharp limestone will punish anything less. The 6-mile route is best tackled in dry season (December-April) when the clay doesn’t turn into axle-deep gumbo. No permits needed, but bring your own water since the forest lacks reliable sources. You’ll earn solitude in one of Puerto Rico’s least-visited state forests, plus stellar views of the northern coast from the tower ruins.
Trail Specs
| Difficulty | Moderate |
|---|---|
| Trail Type | Technical 4x4 |
| Surface | Dirt, Mixed, Rock |
| Features | Historic, Remote, Scenic |
| Length (miles) | 6 mi / 9.7 km |
| Duration | Half day |
| Max elevation (ft) | 1200 ft |
| Best season | December-April |
| Minimum vehicle | High-clearance 4WD with skid plates |
| Nearest town | Arecibo, Puerto Rico |
| Land manager | Puerto Rico Department of Natural Resources |
| Permit required | No |
| Cell service | Spotty |
| Water crossings | No |
| Dispersed camping | No |
| Start coordinates | |
| End coordinates | |
| Copy both for Google Maps directionsClick to copy the directions URL · or open it directly in a new tab | |
| Find on Google | Search on Google → |
Location
Trail Conditions
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Frequently asked questions
Can a stock Jeep Wrangler or 4Runner run this trail without modifications?
A stock high-clearance 4WD will make it, but skid plates are non-negotiable — the limestone karst surface is jagged and will tear up an unprotected undercarriage. Lifted rigs with all-terrain tires handle it more comfortably, but bone-stock is survivable if you pick your lines carefully.
What's the trail like May through November — is it passable in Puerto Rico's rainy season?
Technically drivable year-round, but the rainy season (May–November) turns the dirt sections into slick clay over limestone, which is a genuinely sketchy combination. December through April is the dry season and the right call — you'll also get cleaner views and cooler temps through the karst forest.
Do I need a permit to access Cambalache State Forest, and is there a fee?
Cambalache State Forest is managed by the Puerto Rico Department of Natural Resources (DRNA) and access is generally free, but regulations can shift — contact the DRNA Arecibo office before you go to confirm current entry rules and whether any areas near the radio tower ruins are restricted.
What's the hardest section of the trail and what makes it technical?
The climb toward the radio tower ruins is where it gets real — exposed limestone ledges, embedded rocks, and off-camber shelf sections demand deliberate line choice and crawl-speed control. The karst terrain doesn't give you traction the way dirt does, so momentum management matters more than power here.
How far is the nearest fuel stop, and is there any water available on trail?
Arecibo is your last reliable fuel stop — top off before you head in. There is no water on trail, and this is genuinely dry forest terrain, so bring more than you think you need, especially May through October when ambient temps spike hard.
Trail track
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