Trail Overview
Fan Dike (Forest Road 437) is a scenic, steep out-and-back trail in the Rio Grande National Forest, ideal for high-clearance four-wheel-drive vehicles seeking a continuous climb with panoramic views of the Sangre de Cristo Mountains. Spanning approximately 3 miles, this mountain route begins at an elevation of 9,553 feet at its junction with North Fork Road (Forest Road 34) and climbs steadily to a peak of 11,715 feet. Drivers will navigate a series of tight switchbacks and narrow shelf-road sections on a surface of dirt and loose rock. While there are no major obstacles, the steep drop-offs and narrow track require careful tire placement and a focused driver, earning it a moderate technical rating of 3.
As the trail ascends, several primitive dispersed campsites are scattered along the lower and middle sections, offering secluded overnight options amidst the pine forest. The route terminates abruptly at 11,715 feet, providing a wide area with ample room to turn around before descending. From the summit, visitors are rewarded with expansive vistas of the surrounding valleys and neighboring peaks of the Culebra Range. The trail is best run from late spring to early autumn, as winter snows block access and make the steep switchbacks impassable. High-clearance vehicles with low-range gearing are recommended to handle the loose traction and steady, demanding incline.
Access Description
The route is located within the Rio Grande National Forest and is managed by the U.S. Forest Service. No permits or fees are required to drive the trail, but it is subject to seasonal closures during winter and spring when heavy snow and mud make the switchbacks impassable.
