(Portland, OR) -- Parking permits will be required to visit Multnomah Falls starting May 26th. The timed permits help to reduce congestion in the parking lot. The permits cost two-dollars and can be purchased online at recreation-dot-gov. A limited number of free permits will be available at the Gateway to the Gorge Visitor Center in Troutdale. The permits will be needed through September 4th. Permits will not be required this year to drive the Waterfall Corridor on the historic Highway 30.