Washington State Route 251
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| Northport–Boundary Road | ||||
A map highlighting the route of SR 251 prior to 1983.
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| Route information | ||||
| Auxiliary route of SR 25 | ||||
| Defined by RCW 47.17.470 | ||||
| Length: | 10.86 mi (17.48 km) | |||
| Existed: | 1964 – 1983 | |||
| Major junctions | ||||
| South end: |
 SR 25 in Northport
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| North end: |
 BC 22A at the Canada–United States border
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| Location | ||||
| Counties: | Stevens | |||
| Highway system | ||||
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State Route 251 (SR 251, now Northport–Boundary Road) is a former 10.86-mile (17.48 km) long state highway in Stevens County, Washington. The highway began at SR 25 in Northport and continued northeast parallel to the Columbia River to Boundary, an unincorporated community, where it crossed the Canada–United States border into British Columbia as British Columbia Highway 22A. SR 251 was originally a county road until 1913, when it was added to the state highway system, but was later removed. The roadway was re-added as an extension to an already existing state highway. In 1937, it was reclassified as a secondary highway named Secondary State Highway 22A (SSH 22A) until 1964, when it became SR 251. In 1984, control of the road was relinquished by the state to Stevens County and it was renamed Northport–Boundary Road.
State Route 251 (SR 251), now known as the Northport–Boundary Road or Boundary Highway, began in Northport at an at-grade intersection at Center Street, known as SR 25. The highway turned north from SR 25 and followed the Columbia River upstream as well a railroad owned by the Kettle Falls International Railway. The highway traveled northeast, then east through a series of hairpin turns before turning north to Boundary, an unincorporated community in Stevens County, where SR 251 entered Canadian customs and continued into British Columbia as British Columbia Highway 22A (BC 22A).
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