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State Route 20, also known as SR 20 or North Cascades Highway, is a State Highway (Route) in Washington. It travels from an intersection with U.S. Route 101 at Discovery Bay near Port Townsend to Newport at a junction with U.S. Route 2 about 400 feet (122 m) from the Idaho state line.
[edit] Route description
Washington Pass along North Cascades Highway
SR 20 begins in Discovery Bay, Washington at U.S. Route 101 and goes north to Port Townsend. It is connected via a ferry into Island County. From Island County, the route continues into Skagit County, crosses the Cascade Mountains by means of Washington Pass into Eastern Washington, and terminates in Newport, Washington near the Idaho border. The highway opened in September 1972 and has been called "The Most Beautiful Mountain Highway in the State of Washington."[2] Although U.S. Route 12 has a larger east–west extent, SR 20 is the longest highway in Washington at 436.13 miles (701.88 km), only 5.3 miles (8.6 km) longer than US 12.[1]
Probability chart for first opening/final closing dates
[3]
[edit] Annual closure
SR 20 is one of only three State Routes in Washington that have portions closed in the winter (the others being State Route 410 and State Route 123). Washington Pass annually receives several feet of snow throughout the winter, and is prone to avalanches leaving over 20 feet of snow on the road.
For fall 1972 to spring 2007 inclusive, the median first open date was April 20. The median final closure date was November 25. During the drought of the winter of 1976–1977, the highway was not closed.[3]
[edit] Major intersections
| County |
Location |
Mile[1] |
Destinations |
Notes |
| Jefferson County |
|
0.00 |
 US 101 – Quilcene, Olympia, Port Angeles |
|
|
7.79 |
 SR 19 south – Port Ludlow |
|
| Port Townsend |
12.57 |
Port Townsend-Keystone Ferry across Admiralty Inlet |
| Island |
|
|
16.00 |
 SR 525 south – Mukilteo Ferry |
|
| Skagit |
Anacortes |
47.45 |
 SR 20 Spur – Anacortes, San Juan Ferry |
|
|
54.07 |
Farm to Market Road, Best Road |
Former SR 237 |
|
54.62 |
 SR 536 east – Mount Vernon |
No access from SR 20 west to SR 536 east |
| Burlington |
59.10 |
 I-5 – Vancouver, BC, Seattle |
Interchange |
| Sedro-Woolley |
64.37 |
 SR 9 south – Arlington |
West end of SR 9 overlap |
| 65.64 |
SR 9 north – Sumas |
East end of SR 9 overlap |
| Rockport |
97.21 |
 SR 530 west – Darrington, Arlington |
|
|
105.63 |
Cascade Road – Marblemount |
Former PSH 17 |
| Okanogan |
|
179.08 |
Lost River Road – Mazama |
Former PSH 16 |
| Twisp |
200.93 |
Second Avenue |
Former PSH 17 |
|
203.48 |
 SR 153 south – Chelan, Wenatchee |
|
|
229.99 |
Old 97 – Malott, Brewster |
Former US 97 south; proposed SR 213 |
| Okanogan |
232.20 |
 
  SR 215 north / US 97 Bus. north / SR 20 Bus. east – Okanogan, Omak |
West end of US 97 Bus. overlap |
|
232.70 |
US 97 south – Wenatchee |
East end of US 97 Bus. overlap; west end of US 97 overlap |
| Omak |
237.76 |
 SR 155 south – Omak, Grand Coulee Dam |
|
|
238.84 |
SR 215 south / US 97 Bus. south / SR 20 Bus. west – Omak |
|
| Tonasket |
261.34 |
US 97 north – Penticton |
East end of US 97 overlap |
| Ferry |
Republic |
302.03 |
 SR 21 south – Keller, Wilbur |
West end of SR 21 overlap |
|
304.59 |
SR 21 north – Curlew, Grand Forks |
East end of SR 21 overlap |
|
341.43 |
 US 395 north – Laurier, Grand Forks |
West end of US 395 overlap |
| Stevens |
|
344.18 |
 SR 25 – Marcus, Northport, Davenport |
|
| Colville |
354.33 |
US 395 south – Spokane |
East end of US 395 overlap |
| Pend Oreille |
|
389.66 |
 SR 31 north – Metaline Falls |
|
|
420.70 |
 SR 211 south – Spokane, Davis Lake, Sacheen Lake |
|
| Newport |
436.13 |
 US 2 – Sandpoint, Spokane |
|
[edit] See also
[edit] References
