Infighting has upended the city council of a third Portland suburb this fall.

This time it’s the small city of North Plains in Washington County, where a city councilor resigned Monday saying the elected volunteers failed to work collaboratively, sowing distrust.

The departure of Michele McCall-Wallace came as North Plains was already searching for a new volunteer mayor amid ongoing debates over whether the city of 3,500 people should grow and how.

Last year, voters in North Plains rejected a city plan to add 855 acres to its urban growth boundary .

McCall-Wallace served on the council for just over nine months after she was appointed to serve the remainder of another councilor’s term, according to the Hillsboro News Times.

In her resignation letter, McCall-Wallace said the city c

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