1987 Sediment Dam Built
June 1, 1987
1997 Johnston Ridge Opens
May 13, 1997
The reconstructed 52-mile-long Spirit Lake Memorial Highway opens to traffic, connecting Castle Rock to stunning viewpoints in the blast zone.
- Where Nature Erupts
- (360) 577-3137
- tourism@visitmtsthelens.com
1994 Memorial Hwy Opens
