Bosque Estatal de Susúa Observatory Road
Rainforest climb to abandoned radio tower views
The climb up to Susúa’s abandoned radio tower starts innocuously enough on PR-366, but once you hit the forest service gate, the real fun begins. The narrow dirt track winds through dense rainforest canopy, crossing multiple water bars and rocky outcrops as it climbs nearly 1,400 feet in just over 3 miles. The final approach to the tower requires careful navigation around washouts and fallen trees, but the payoff is a 360-degree view from Cerro La Santa to the Caribbean coast.
This is a technical moderate route requiring high-clearance 4WD and recovery gear. The wet season from May through November makes the clay sections treacherous, so stick to the dry months. No permits required, and there are several pull-offs for primitive camping along the ridge. Fuel up in Yauco before heading in — this remote corner of the Susúa State Forest sees more wild pigs than people, and that’s exactly why it’s worth the drive.
Trail Specs
| Difficulty | Moderate |
|---|---|
| Trail Type | Technical 4x4 |
| Surface | Dirt |
| Features | Historic, Remote, Scenic |
| Length (miles) | 7 mi / 11.3 km |
| Duration | Half day |
| Max elevation (ft) | 2850 ft |
| Best season | December-April |
| Minimum vehicle | High-clearance 4WD |
| Nearest town | Yauco, Puerto Rico |
| Land manager | Puerto Rico Department of Natural Resources |
| Permit required | No |
| Cell service | None |
| Water crossings | Yes |
| Dispersed camping | Yes |
| Start coordinates | |
| End coordinates | |
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Location
Trail Conditions
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Frequently asked questions
Can a stock Jeep Wrangler or 4Runner handle Observatory Road, or do I need lockers?
A stock high-clearance 4WD with decent all-terrain tires will get most rigs through. Lockers help on the steeper muddy pitches but aren't mandatory — aggressive mud tires matter more here than hardware.
Is this trail passable in the summer rainy season?
Technically yes, but Puerto Rico's summer rainy season (May–November) turns the clay dirt surface into a slick mess and raises the water crossings significantly. December through April is the dry season window — plan accordingly.
Do I need a permit to run this trail or camp in Bosque Estatal de Susúa?
The Puerto Rico Department of Natural Resources manages this forest and technically requires a permit for overnight camping. Contact DRNA directly before your trip — enforcement is inconsistent but the permit requirement is real.
What's the hardest section of the trail and what should I expect?
The steepest technical climb happens in the upper third approaching the abandoned radio tower — loose rock, exposed roots, and clay surface that gets brutally slick when wet. Off-camber shelf road with no guardrails and limited room to recover if you slide.
There's zero cell service on trail — how far is the nearest gas and what's the fuel range situation?
Yauco is your last stop for fuel, roughly 20 minutes from the trailhead — fill up there. The trail itself is only 7 miles but the mountain roads in and out add up; don't roll in with less than a half tank.
Trail track
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