Denny Creek natural waterslides
Creek · Washington
About this swimming hole
A series of smooth granite slabs on Denny Creek where clear, chilly water runs into natural waterslides and shallow pools. Families stop at the slide rocks about a mile in from the trailhead, making it the I-90 corridor's most famous family swim hike.
Good to know
| Water type | Creek |
|---|---|
| Water temperature | 45-50 in summer |
| Depth | shallow slide pools |
| Best season | July-September |
| Fees | NW Forest Pass or day-use fee |
| Reservations required | No |
| Hours | daylight hours |
| Parking | Denny Creek/Franklin Falls trailhead; fills by mid-morning |
| County | King County |
| Nearest town | Snoqualmie Pass |
| Safety notes | no lifeguard; swift frigid current; creek crossing bridge washed out — ford carefully |
Map
Official information
Official park / agency page ↗ — check current conditions, fees, and reservations here before you go.
Nearby swimming holes
Frequently asked questions
Does Denny Creek natural waterslides require reservations?
No reservations are required at Denny Creek natural waterslides based on current information — but verify before you go.
Is there a fee to visit Denny Creek natural waterslides?
Reported fee info: NW Forest Pass or day-use fee. Fees can change — confirm with the official link.
When is the best time to visit Denny Creek natural waterslides?
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