Iron Brigade Loop – Henry's Ridge & Black Diamond Natural Area

Embark on the Iron Brigade Loop for a moderate 5.1-mile (8.2 km) hike, featuring 307 feet (94 metres) of elevation gain and typically taking about 2 hours and 10 minutes to complete. This singletrack path winds through dense forests, offering a dynamic experience with gentle climbs and flowing descents. You will navigate over roots, rocks, and logs, encountering diverse scenery that includes marshy sections and occasional powerline clear-cuts. Keep an eye out for streams like Rock Creek and Ravensdale Creek, where the presence of beavers and freshwater mussels indicates healthy water quality within the 1,240-acre natural area.

While the Iron Brigade trail is primarily known for mountain biking, hikers generally find it accessible and enjoyable. The trail's good drainage soils and ample tree cover make it a pleasant option in various conditions. Be aware that the path can be prone to tree fall, especially after storms, so exercise caution during your visit. You have the flexibility to traverse the loop in both directions, allowing you to customize your experience.

This trail is a key segment within the Henry's Ridge & Black Diamond Natural Area, a protected natural land managed by King County Parks that was once industrial timberland. It is part of an extensive network offering nearly 20 miles of multi-use trails, connecting to other recreational areas like Black Diamond Open Space and Lake Sawyer. The trail system is actively maintained through collaboration between King County Parks and local groups, ensuring a well-kept environment for all users.