Colonial Creek South Campground
Opens May 18, 2026 for the peak season. Reservations required late May through early September via Recreation.gov. Sites #64-95 and #116-164 book 6 months in advance; sites #96-113 book 7 days in advance. Unreserved sites available same-day, first-come, first-served for one night only. Ten walk-in tent sites (#64-73) remain open year-round without fees or services.
Heat Advisory issued July 21 at 3:19PM PDT until July 22 at 11:00PM PDT by NWS Seattle WA
* WHAT...Hot conditions with high temperatures in the upper 80s to lower 90s and low temperatures around 60 degrees. This will pose a moderate risk of heat-related illness. * WHERE...Eastern Strait of Juan de Fuca, Foothills and Valleys of the North Cascades, Lake Crescent Area Including US 101, Lowlands of Western Skagit and Northwestern Snohomish Counties, Lowlands of Western Whatcom County, Northern Hood Canal, and Port Townsend Area. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Heat will significantly increase the risk of heat-related illnesses for those who are sensitive to heat, especially those without effective cooling or adequate hydration. * ADDITIONAL DETAILS...Areas closest to the water will experience cooler daytime high temperatures.
Air Quality Alert issued July 20 at 12:48PM PDT by NWS Seattle WA
An Air Quality Alert has been issued by the Northwest Clean Air Agency until 9 AM PDT Wednesday. An Air Quality Alert has been issued for Skagit and Whatcom Counties, effective immediately through Wednesday July 22nd at 9am due to expected wildfire smoke from Canadian wildfires. Particulate matter (PM2.5) levels may reach Unhealthy for Sensitive Groups. When air quality is Unhealthy for Sensitive Groups, sensitive groups should take steps to reduce exposure. Limit time outside, avoid strenuous outdoor activity, and follow tips for cleaner indoor air. Everyone should watch for symptoms as a sign to reduce exposure. For current air quality conditions and additional information visit https://nwcleanairwa.gov
Air Quality Alert issued July 20 at 10:23AM PDT by NWS Seattle WA
An Air Quality Alert has been issued by the Northwest Clean Air Agency until 9 AM PDT Wednesday. An Air Quality Alert has been issued for Skagit and Whatcom Counties, effective immediately through Wednesday July 22nd at 9am due to expected wildfire smoke from Canadian wildfires. Particulate matter (PM2.5) levels may reach Unhealthy for Sensitive Groups. When air quality is Unhealthy for Sensitive Groups, sensitive groups should take steps to reduce exposure. Limit time outside, avoid strenuous outdoor activity, and follow tips for cleaner indoor air. Everyone should watch for symptoms as a sign to reduce exposure. For current air quality conditions and additional information visit www.nwcleanairwa.gov
About
Colonial Creek South Campground is a bustling yet remote destination surrounded by western redcedar, western hemlock, Douglas-fir, and red huckleberries in the Ross Lake National Recreation Area. Located on the south shore of the striking turquoise Diablo Lake near milepost 130 on State Route 20, the campground offers 93 sites ranging from small to medium, accommodating tents, small trailers, and RVs up to 36 feet. The campground provides flush toilets and potable water during the peak season, with vault toilets available year-round. An RV dump station, trash and recycling collection, bear boxes at each site, and designated fire rings are available seasonally. Three ADA-accessible sites are offered. Campers can fish Diablo Lake with a Washington State license and access the Thunder Creek Trailhead directly from the south loop. Black bears are active throughout the area. All food, coolers, and scented items must be stored in bear boxes or vehicles when not in use. No firewood, ice, gas, or supplies are available within the park complex; the nearest services are in Marblemount, approximately 20 miles west.
Directions
Located at milepost 130 on State Route 20. From Burlington, WA, drive 70 miles east on SR 20. From Twisp, WA, drive 71 miles west on SR 20. The campground is 20 miles east of Marblemount and 63 miles west of Winthrop.
Nearby Campgrounds
Location
Amenities
| Water | Yes |
| Fires Allowed | Yes |
| Toilets | Yes |
| Dump Station | Yes |
| Wifi | — |
| Pets Allowed | Yes |
| Showers | No |
| Electric Hookups | — |
| Water Hookups | — |
| Sewer Hookups | — |
| Camp Store | No |
| Price | $24 |
Vehicle
| Max RV Length | 36ft |
| Max Trailer Length | 36ft |
| Big Rig Friendly | No |
| Pull Through Sites | No |
Contact
| noca_information@nps.gov | |
| Phone | +1 (360) 854-7200 |
Cell Service
| AT&T | None |
| Verizon | None |
| T-Mobile | None |
Availability
Photos
Community Posts
No posts yet. Be the first to share your experience!