CampgroundsDB

Clark Island Marine State Park

Its 15 sites are first-come, first-served (no reservations), camping costs Primitive and water trail sites $12/night (statewide rate), and it is open year-round. Clark Island Marine State Park is a State Park campground near Marietta-Alderwood, Washington.

First-come, first-served

State Park · Marietta-Alderwood, Washington

Clark Island viewed from Mount Constitution
Clark Island viewed from Mount Constitution. Photo: Steve Voght from Seattle, WA, USA, CC BY-SA 2.0
Managed by
State Park
Hookups
None

Clark Island Marine State Park sits inside San Juan Islands National Monument. Its camping rule, field office, and boundary are on publiclandsdb.com. It sits 0.5 miles outside the boundary of San Juan Islands National Wildlife Refuge; its hours, camping, hunting and fishing rules, and boundary are on publiclandsdb.com. It sits 0.5 miles outside the boundary of San Juan Wilderness; its permit and camping rules and boundary are on publiclandsdb.com.

Getting a site

Managed by
State Park
Reservations
None, first-come
Fee
Primitive and water trail sites $12/night (statewide rate)
Entrance fee
None for campers in the park they stay in; Discover Pass $10/day or $45/year for day visits

Source: parks.wa.gov, accessed 2026-09-29

Sites and hookups

Total sites
15
Hookups
None
  • ✓ Toilets
  • ✓ Fire rings
  • ✓ Pets allowed
  • ✕ Potable water

On site: Toilets, fire rings, and pets allowed. No potable water.

Source: parks.wa.gov, accessed 2026-09-29

Rules

Stay limit
10 nights in one park within a 30-day period; 90 nights per calendar year in all state parks
Quiet hours
10 p.m. to 6:30 a.m.
Pets
Allowed

Source: parks.wa.gov, accessed 2026-09-29

Access and cell service

Elevation
80 ft

Cell coverage by carrier (FCC map)

AT&T
4G LTE and 5G (35/3 Mbps)
T-Mobile
4G LTE and 5G (7/1 Mbps)
Verizon
4G LTE and 5G (7/1 Mbps)
Source: FCC Broadband Data Collection, data as of December 31, 2025

Outdoor coverage each carrier reports to the FCC at this campground's map point, and the nearest mapped coverage within about half a mile. The FCC map only includes 4G LTE at 5/1 Mbps or better and 5G; a weaker signal, a text, or an emergency call may still get through, but don't count on it. These are carrier predictions, not measurements, and can be wrong either way: real service in canyons, under trees, and inside a tent or vehicle is often weaker. 5G speeds are the FCC's 7/1 and 35/3 Mbps tiers. This product uses the FCC Data API but is not endorsed or certified by the FCC.

48.7006, -122.7641 in San Juan. Open in OpenStreetMap. Map © OpenStreetMap contributors.

Open in Google Maps Directions

Season and winter services

Clark Island Marine State Park is open year-round . In winter: water off, per the managing agency.

Sources: parks.wa.gov, accessed 2026-09-29; epqs.nationalmap.gov, accessed 2026-09-29

Common questions

Do you need a reservation at Clark Island Marine State Park?
No. Clark Island Marine State Park is first-come, first-served: there is no reservation system, so arrive early to claim an open site.
How much does it cost to camp at Clark Island Marine State Park?
Camping at Clark Island Marine State Park costs Primitive and water trail sites $12/night (statewide rate).
Is there a separate entrance fee at Clark Island Marine State Park?
No, there is no separate entrance fee at Clark Island Marine State Park; only the camping fee applies.
How many campsites does Clark Island Marine State Park have?
Clark Island Marine State Park has 15 campsites.
Does Clark Island Marine State Park have RV hookups?
No. Clark Island Marine State Park has no hookups.
Is there drinking water at Clark Island Marine State Park?
No. Clark Island Marine State Park has no potable water, so bring all the water you need.
Are dogs allowed at Clark Island Marine State Park?
Yes, pets are allowed at Clark Island Marine State Park.
When is Clark Island Marine State Park open?
Clark Island Marine State Park is open year-round.
Is Clark Island Marine State Park open in winter?
Yes, Clark Island Marine State Park is open year-round; in winter the water is shut off.
How long can you stay at Clark Island Marine State Park?
The stay limit at Clark Island Marine State Park is 10 nights in one park within a 30-day period; 90 nights per calendar year in all state parks.
Is there cell service at Clark Island Marine State Park?
Yes, outdoors: the FCC's National Broadband Map (data as of December 31, 2025) shows 4G LTE and 5G from AT&T, T-Mobile, and Verizon at Clark Island Marine State Park. The map is carrier-reported and modeled for outdoors, so expect weaker service in canyons, under trees, and inside a tent or vehicle.
Who manages Clark Island Marine State Park?
Clark Island Marine State Park is managed by the state park system.

Around Clark Island Marine State Park

fishypedia.com · 5.4 miles

The nearest lake with a fishing page is Cascade Lake, whose mapped center point is 5.4 miles away in a straight line. Stocking record and species: Cascade Lake fishing on fishypedia.com.

Lakes · within 15 miles

Other lakes within 15 miles: Lake Terrell fishing (12 miles) , Lake Padden fishing (14 miles) , and Hummel Lake fishing (14 miles) , each with its stocking record on fishypedia.com.

Public land · within 15 miles

Public land within 15 miles: Moran State Park (3.5 miles to its center) , Obstruction Pass State Park (7.2 miles to its center) , Upright Channel State Park (12 miles to its center) , Spencer Spit State Park (12 miles to its center) , and Larrabee State Park (14 miles to its center) ; publiclandsdb.com has each unit's camping rules and boundary.

Hot springs nearby

swimholesmap.com · within 30 miles

The nearest hot spring to Clark Island Marine State Park, in a straight line: Doe Bay Resort Hot Springs (hot spring, 4.5 miles). Each has its own page on swimholesmap.com.

First-come Matia Island Marine State Park Birch Bay · State Park Season Year-round Fee Primitive and water trail sites $12/night (statewide rate) First-come Doe Island Marine State Park Anacortes · State Park Season Year-round Fee Primitive and water trail sites $12/night (statewide rate) Reservable Moran State Park Olga · State Park Season Year-round Fee Peak nightly (statewide): standard $31-$43 First-come Pelican Beach Anacortes · State Forest Season Not on record Fee No camping fee (first come, with a Discover Pass)

More campgrounds: camping near Marietta-Alderwood and campgrounds in San Juan.

Sources

Photo credits

First-come, first-served Primitive and water trail sites $12/night (statewide rate)
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