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County directs staff to form working group to review 40-unit subdivision rule

Pennington County Board of Commissioners · March 23, 2026

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Summary

Pennington County commissioners directed planning staff to form a cross-department working group to review the county's "40-unit" subdivision rule, focusing on dead-end road management and public-safety input from emergency services and the highway department.

Pennington County commissioners voted to direct planning staff to convene a cross-department working group to evaluate possible changes to the county's 40-unit subdivision rule.

Jason Thinneson, assistant planning director, told the board the rule has repeatedly put the commission in the role of de facto planners on dead-end road systems and that staff would like to involve emergency services, the state's attorney, and the highway department to identify options. "We would like to involve some other departments in the county: Emergency services, Jerome from fire, maybe Chip from the city fire as well ... the state's attorney's office, and the highway department to kinda form a working group to figure out what the best way ahead is on this," Thinneson said.

Commissioner Roskinec moved to direct staff to evaluate options and proposed changes to the 40-unit rule; the motion was seconded and approved by a voice vote. Commissioners agreed to include the District 1 commissioner in the working group because that district receives many constituent calls about subdivisions.

The board did not set a formal deadline but asked staff to coordinate with County Administration (Jordan) and return with proposed language and recommendations. Thinneson said he does not expect the evaluation to take long if the group includes key stakeholders.

Next steps: staff will convene the working group, draft proposed ordinance language and administrative options, and report back to the board for further direction.