Middle Fork River Trail Puncheon Bridge Construction

The completed Puncheon Bridge

In April 2018 the Middle Fork Snoqualmie River Trail experienced a major landslide that left most of the trail inaccessible. Although the trail has remained closed to the public since then, recreators have still used parts of the trail. It has continued to be a priority to fix this trail for safe access.

In August 2021 the Forest Service and a trails contractor, along with the Greenway Trust, Washington Trails Association and Evergreen Mountain Bike Alliance, and volunteers all worked together to reroute the trail out of the damaged area.
Across several weeks, the Mountains to Sound Greenway trail crew worked on a 32-foot-long puncheon bridge spanning a muddy seep drainage just west of the landslide area, and connects the old trail to the new reroute trail built by Oregon Woods, which circumnavigates the 2018 landslide. The bridge consists of four 16’ stringers, four 5’ sills, and 34 12’’x4’’x4’ pieces of decking (two pieces of decking for the bulkhead). The Greenway Trust opted to go with a customized rock foundation for this structure for long-term stability.

Thanks to matching funds from the Middle Fork Campaign and committed contributions from volunteers with WTA that helped the Forest Service secure the grant to work on the bridge building.

Model bridge built out of scrap wood.
Two large stones being set and crushed in by crew member, Shard. When setting stones within the base layer, cavities were dug out and the stones were placed into them to create the proper batter angle.

 

 

 

Joe (Greenway staff) and Shard (Trail Crew) moving one of the four, 16’ stringers in place
Once the crew ensured that the stringers, middle sills, and side sills were all level and square, end caps were installed.

Check out more Middle Fork projects here.

 

 

Priority Areas:
Middle Fork Snoqualmie Valley
Post Categories:
Recreation