Year-round Mt. St. Helens base camp with 15 full-hookup, 18 water & electric, and 52 standard RV sites. A pedestrian tunnel connects directly to the Mt. St. Helens Visitor Center.
Seaquest State Park is the ideal base camp for Mount St. Helens, sitting in old-growth fir forest with a pedestrian tunnel running under Highway 504 directly to the Mount St. Helens Visitor Center. Fifteen full-hookup sites and 18 water-and-electric sites accommodate RVs up to 50 feet, with flush restrooms, a dump station, and Silver Lake boat access just across the highway. The park operates year-round with diverse campsite options including five yurts.
Seaquest State Park sits directly across Silver Lake from the Mount St. Helens National Volcanic Monument visitor center, in the shadow of the volcano that catastrophically erupted on May 18, 1980 — an event visible and audible across half of Washington State. The surrounding landscape represents one of the world's most closely studied examples of post-volcanic ecological recovery, where elk, black bear, and wolves have returned to terrain that was stripped of all life in 1980. Silver Lake itself is one of western Washington's most productive warm-water fisheries, with largemouth bass and yellow perch in a shallow, weed-rich lake that also supports nesting osprey, great blue herons, and migratory waterfowl in the shadow of the volcano.
Sourced from first-hand visits, park ranger notes, and RV community reports. Updated when conditions change.
Sites on the Silver Lake loop (1–30) are best for lake access and fishing. Hookup sites in the upper loops are well-equipped for extended stays. The park's location directly across from the Mt St Helens Johnston Ridge Observatory Visitor Centre (free day-use access) is the major draw. Sites 1–15 nearest Hwy 504 can have some road noise; request an upper loop site for quiet nights.
| 📍 Nearest Town | Castle Rock, WA |
| ⛽ Gas Station | 5 mi |
| 🛒 Grocery Store | 5 mi |
| 🏪 Costco | 50 mi |
| ☕ Starbucks | 15 mi |
| 🏕️ Nearest State Park | 22 mi |
Stock up in Castle Rock, WA before heading out — services get limited near the campground.
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Check availability online. Reserving 6 months in advance.