Seaquest State Park
RV Guide


As one of the parks with a stunning view of Mount St. Helens, Seaquest State Park, which sits along the Silver Lake shoreline, features dappled sunlight rays that beam through beautiful forest trees. Located in Castle Rock, Washington, Seaquest State Park is situated on 475 acres of land with forest vegetation and the wetlands of Silver Lake. The 10-foot deep Silver Lake, a major attraction of the park, was formed after the 1980 eruption of Mount St. Helens.

Featuring hiking and biking trails, children’s play areas, boardwalk facilities, horseshoe pits, a volleyball field, and a trailer dump station, Seaquest State Park is a recommended destination on your next RV road trip. The Park also features a Yurt village, and has full RV hookups for your rig. As soon as you arrive in your RV, you are greeted by the park’s magnificent countryside, and can embark on tours and trails (including an ADA-accessible trail), boat launches, fishing, picnicking, and wildlife viewing.

Flush with more than twenty species of plant life, the entire park gives off a resplendent appearance to make you feel comfortable throughout your RV trip. Kids on the trip will absolutely love the human-made sand dune at the children's playground.

RV Rentals in Seaquest State Park



Seaquest State Park is a simple drive-in for your RV as it is located just along Spirit Lake Highway/Highway 504 in Castle Rock, WA. Within the park, paved roads connect all the campsites and the Yurt Village and there are no driving restrictions for either RVs or trailers. As a result, there is ease of access and navigation to your campsite of choice.


There are four parking lots available for use for your RV, trailer, or car in Seaquest State Park. No matter where you are camped - the RV Loop, Group Camp, Day-use area, South Loop, or Yurt Village, the parking spaces are big enough for your RV and strategically positioned to be accessible to the sites. What’s more, overnight parking is available for RVs, extra vehicles, as well as vehicles towed by the RV.

Public Transportation

Campgrounds and parking in Seaquest State Park

Campsites in Seaquest State Park

Reservations camping

RV Loop

The RV Loop in Seaquest State Park comprises 16 campsites available for RVs throughout the year. All the sites provide full RV hookup support to campers including electricity, water, and sewer hookups. Amenities include hot showers, restroom, a Paystation, and a firewood point. Services not offered at the campground can be found in Castle Rock, six miles west of the park. Trails link the sites in the loop to other parts of the park. Reservations are suggested in the summer, and some of the campsites can accommodate RVs up to 70 feet long. The use of generators is permitted between 8am and 9pm, and the quiet hours are from 10pm to 6:30am. All RV campers are allowed to have their pets. You can stay for up to 10 consecutive days. Campsites within the loop are connected via paved roads to the park entrance.

North Loop

Seaquest State Park features over 50 pet-friendly campsites in the North Loop, open to RV campers all year-round. 18 of the campsites in the loop have electricity and water hookup. Hot showers, restrooms, Paystation, and camping facilities are available in the North Loop. RV campers hike trails from the loop to the Day-use area. Reservations are suggested in the summer and the maximum RV length is 50 feet. Generator use is permitted from 8am to 9pm, with quiet hours between 10pm and 6:30am. All the sites in the loop are connected by paved roads and accessible to the park entrance. Stay of up to 10 days at a time is allowed in the North loop.

Seasonal activities in Seaquest State Park


Visitor Center

The Mount St. Helens Visitor Centre located just across from the campsites is a destination in itself! It is the place to visit to learn about Mount St. Helens. Check out the visible displays, exhibits, documentaries, and Ranger talks as they unravel the ecology and history of the park, the mountain and its volcanic eruptions, and the native culture of the inhabitants. The Centre is accessed from the campground on a hiking trail through an under-road tunnel, and all RV campers are welcome to join in the activities at the Centre.


If you have your bike in your RV, you will love the Seaquest State Park bike trails which run for several miles along the woods. The trails cover the entire park, giving the rider the opportunity to soak in the landscape, terrain, and features within the park as they ride or cycle through the campsites and loops. Should you choose to go on the trails as part of a group of riders, the bike camp area in the park is the place to meet and interact with other bikers while you set out on your adventure.


The sheer number of picnicking facilities at the park make it the perfect place for your RV. You can have family reunions, class reunions, or any other get-together activity of choice. Imagine the recreational possibilities with the group day-use kitchen shelter with electricity, 125 unsheltered picnic tables, a fire circle, a covered shelter for tables, a tent area, two braziers and hose bib facilities on site. Some of these facilities are on first-come, first-served basis, while others are booked by reservation.



Hiking in Seaquest State Park is a popular activity and a must-do on your RV camping trip. There is a six-mile hiking trail in its woodlands as well as a one-mile trail accessible to people with disabilities, making hiking an activity for all. The trails which pass through forest vegetation and woods are clearly marked at their entrances, thereby facilitating easy navigation and appreciation of the scenery along the trail, whether you are hiking alone or as part of a group.


Bring your fishing game for different species of fish to catch at the Silver Lake. As an excellent fishery for Largemouth Bass, it also provides good fishing for species such as Yellow Perch, Brown Bullhead, Bluegill Sunfish and Carp. Depending on your fishing skills and your time of visit, you may catch species such as Coho salmon, Pumpkinseed, Rainbow Trout, Sculpin, Sucker, Warmouth, and White crappie. Rainbow Trout, for example, are stocked in the spring.

Wildlife Viewing

Seaquest State Park hosts bears, coyote, deer, foxes, rabbits, raccoons, skunks, and squirrels, all of which provide an excellent view along the trails in the park, particularly in the lowland forest habitats. Birding is also a popular activity, so, carry your binoculars in your RV on your visit to the park. Species of birds seen along the trails and boardwalk include ravens, ducks, eagles, grouse, hawks, herons, hummingbirds, ospreys, owls, woodpeckers, and wrens.