Colonial Creek Campground, Diablo Lake
Lake · Washington
ℹ️ Community-reported spot. Details below are compiled from public sources and are reported to be accurate — always verify locally before visiting.
About this swimming hole
The National Park campground on Diablo Lake's shore, where the glacially turquoise reservoir is swimmable from the rocky shoreline. Paddlers and swimmers share the surreal blue-green water with Ross Lake's mountain backdrop.
Good to know
| Water type | Lake |
|---|---|
| Water temperature | 50-55 in summer |
| Best season | July-September |
| Fees | NPS pass or entry fee |
| Reservations required | No |
| Hours | daylight hours |
| Parking | campground lot |
| Amenities | vault toilet, campground, boat launch |
| County | Whatcom County |
| Nearest town | Newhalem |
| Safety notes | no lifeguard; very cold glacial water; boat traffic |
Map
Nearby swimming holes
Frequently asked questions
Does Colonial Creek Campground, Diablo Lake require reservations?
No reservations are required at Colonial Creek Campground, Diablo Lake based on current information — but verify before you go.
Is there a fee to visit Colonial Creek Campground, Diablo Lake?
Reported fee info: NPS pass or entry fee. Fees can change — confirm with the official link.
When is the best time to visit Colonial Creek Campground, Diablo Lake?
The best season is typically July-September.
⚠️ Verify before you go. Conditions, fees, reservations, and access can change — confirm details with the official link before visiting. Last verified: September 2026