From Tuesday June 1 through Friday June 11, weekday access to Waterton Canyon will be closed for Denver Water’s annual dust mitigation project. Neither the parking lot at the canyon’s entrance nor the canyon will be accessible during this time. Waterton Canyon will remain open on Saturday, June 5, and Sunday, June 6, for weekend recreation.
WATERTON ALTERNATIVES. CT travelers who have dogs might want to start at Indian Creek Trailhead. Those preferring singletrack in place of the closed-to-public-vehicles Waterton Canyon road walk might choose to start either at Indian Creek Trailhead or at Roxborough State Park. Potentially helpful are the bottom-of-the-page info plus the linked map presented here:
Alternative CT Starts near Denver via ColoradoTrail.org
Other possibly helpful links:
* Waterton Canyon Safety Guidelines
Long-term PARKING possibilities include RV Storage businesses like this one
Forest Service Website for Indian Creek Trailhead