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Effective Jan. 1, a small segment of the boundary of Multnomah County and Washington County was altered, with “Area 93” — 160 acres along the western slope of the Tualatin Mountains — officially becoming part of Washington County.

The change is the first adjustment of the counties’ shared boundary in 160 years.

Area 93, about 2.5 miles north of the Highway 26-Oregon 217 interchange in eastern Washington County, has been isolated from other urbanized areas in Multnomah County by a rural reserve area approximately one-half mile in width.

Officials came up with the idea of moving the county boundary after planning work revealed that services essential for developing the property could not be provided in an effective manner by either the city of Portland or Multnomah County. These services — including water, sewer, parks, roads and police protection — were much more readily available through annexation to special districts already serving the urban unincorporated residents of Washington County.

“The boundary change will provide our newest neighbors essential services, such as fresh water and police protection, and allow additional lands to be made available for development without compromising valuable farm and forestland elsewhere,” said Washington County Chairman Andy Duyck.

Property taxes for Area 93 residents will increase as additional services are provided to the parcel.

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