Washington State Route 155
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A map of SR 155's area with the highway highlighted in red.
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| Route information | ||||
| Auxiliary route of US 97 | ||||
| Defined by RCW 47.17.300 | ||||
| Maintained by WSDOT | ||||
| Length: | 80.47 mi (129.50 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| South end: |
 US 2 in Fordair
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 SR 174 in Grand Coulee  SR 155 Spur in Omak
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| North end: |
  US 97 / SR 20 in Omak |
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State Route 155 is a state highway in the U.S. state of Washington, running from U.S. Route 2 in Fordair over Disautel Pass to U.S. Route 97 and State Route 20 in the city of Omak. It is the main north–south route through the area around Grand Coulee Dam.
State Route 155 begins at an intersection with U.S. Route 2 in Fordair, just northeast of Coulee City. From there, the highway heads north, paralleling the shore of Banks Lake for much of the southern part of the route. After passing Steamboat Rock State Park, it crosses over Osborn Bay Lake before passing through Electric City. It then intersects State Route 174 in Grand Coulee. The highway then heads northeast, crossing the Columbia River just north of the Grand Coulee Dam.
On the north side of the Columbia, State Route 155 turns west and traverses the Colville Indian Reservation, passing through the communities of Nespelem and Disautel, crossing Disautel Pass at an elevation of 3,252 feet (991 m). As the highway descends from the pass, it approaches the town of Omak on Omak Avenue. On the east side of the town, it crosses under the two-lane carriageway of U.S. Route 97 and State Route 20. Since there is no access immediately at this underpass, State Route 155 continues three blocks west before turning south along Dayton Street to access U.S. Route 97.
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