Recreation sites and viewpoints remain open on State Route 504 to Milepost 43

Limited closures implemented following South Coldwater Slide

Many recreational sites remain open to explore at Mount St. Helens National Volcanic Monument following a May 14, 2023, debris flow, known as the South Coldwater Slide. The debris flow damaged the upper portion of State Route 504 near milepost (MP) 49 leading up to the Johnston Ridge Observatory north of Mount St. Helens. The area impacted only affects the last eight miles of SR 504 and some associated trailheads and recreation sites.

The highway remains open to MP 43 near the Science and Learning Center at Coldwater. Multiple scenic viewpoints, including Elk Rock (MP 37) and Castle Lake (MP 40) are still accessible. Several visitor center options including the Mount St. Helens Forest Learning Center at MP 33 and Washington State Park Mount St. Helens Visitor Center at Silver Lake off SR 504, near Castle Rock remain open with opportunities to view Mount St. Helens and learn about the history, eruption and recovery of the volcano. 

On May 23, 2023 Gifford Pinchot National Forest implemented a forest closure order that includes the Coldwater Lake Picnic and Boating Recreation Site, Hummocks Trailhead Parking Lot, Hummocks Trail #229, from Hummocks Trailhead to junction with Boundary Trail #1, Boundary Trail #1 from the junction with the Hummocks Trail #229 to the Hummocks Trailhead, Lakes Trail #211 from Trailhead to junction with Coldwater Trail #230, the South Coldwater Trailhead Parking Lot, and South Coldwater Trail #230A from Trailhead to junction with Coldwater Trail #230. The U.S. Forest Service is exploring alternative options to accommodate visitors who would like to visit the north side of the Mount St. Helens National Volcanic Monument this summer. More information about this will be shared when available.

The upper portion of SR 504, to the terminus at Johnston Ridge Observatory, remains closed and inaccessible by vehicle. Visitors should not venture beyond the highway closure at MP43 due to the instability of the hillside.

It is too soon to tell when the highway may reopen. Engineering geologists are assessing preliminary aerial data to help determine when ground access to the slide area can occur. The U.S. Forest Service and Washington State Department of Transportation (WSDOT) are actively gathering and analyzing data to help inform next steps. As snow melts and U.S. Forest Service roads reopen for the season, additional recreational sites on the Mount St. Helens National Volcanic Monument’s south and east sides and in the surrounding areas will open for visitors to explore.

For U.S. Forest Service information visit

For WSDOT information, visit

South Coldwater Slide Closure and Vicinity Map:  

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