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The North Cascades Highway follows State Route 20, that stretches from the Olympic Peninsula near Discovery Bay, across Puget Sound over ferry routes, up and over the Cascade Mountains, and terminates at the Idaho border. Due to the height of the highway (Washington Pass at 5,477 feet), along with the pacific moisture and precipitation, it is closed about five months of the year. The Highway typically opens in April and closes in November although there have been a drought years when it did not close at all. The mountains are currently getting good snow so it is likely to close soon.
The North Cascades national Park and the Cascades Loop HighwayOnce over the mountains and the Columbia River is reached, the Cascade Loop follows the river south on US 97 to Wenatchee where it meets U.S. Highway 2 going west and over Stevens Pass to return to Western Washington and complete the loop. This North Cascades route was originally the corridor used by local Native American tribes as a trading route from Washington's Eastern Plateau country to the Pacific Coast more than 9,600 years ago. It opened as a cross state highway in 1972 as the first National Scenic Highway in the United States, after over 100 years of planning. Appropriately I think, it has been called: "The Most Beautiful Mountain Highway in the State of Washington." In addition to the monster mountains, rivers, and streams, the North Cascades National Park boasts 1,600 plant species, more than any other National Park. Of course all the water helps out.
Follow along below the dividing line for the rest of the trip.