Jefferson County planning commission recommends updates to transportation and access standards; moves package to county commissioners

On May 14, 2025, the Jefferson County Planning Commission voted unanimously to recommend approval of a package of regulation amendments affecting the Transportation Design and Construction Manual, portions of the county Zoning Resolution, the Land Development Regulation and the Storm Drainage Design and Technical Criteria. The Board of County Commissioners will hold the final hearing June 10, 2025.

The package updates technical standards, clarifies when and how applicants must submit transportation studies, and adjusts the county’s process for granting relief from certain access and circulation standards. Engineering Supervisor Lindsey Weier told the commission the changes were intended “to provide clarity and align county requirements with industry standards” and to carry forward into the unified land use code amendments now in process.

Among the substantive changes, staff proposed: defining four types of transportation documentation tied to expected trip generation (transportation information for developments under 150 trips; a trip generation memorandum for 150–800 trips; a transportation analysis for rezonings over 800 trips; and a transportation impact study for plats or site development plans over 800 trips); adding references to Colorado Department of Transportation criteria; clarifying sight-distance and intersection-spacing requirements; updating pavement, median and pavement-marking standards; allowing an administrative pathway to modify previously accepted grading plans rather than requiring a new full grading permit; setting a short-distance maximum driveway/private-road grade of up to 15% when specific requirements are met; and shifting the formal decision on relief requests in some private-street and cul-de-sac situations from fire protection districts to the Director of Planning and Zoning while retaining fire district input.

Resident Mike Brolick, who was sworn in before testifying, urged the commission to keep fire protection districts closely involved and raised concerns about several technical items, including sprinkler-system effectiveness in wildfire events, differences between the proposed curve radii and AASHTO guidance, and whether administrative review would allow meaningful public notification. "I would hope that you guys could take a look," Brolick said, citing a comparison his transportation‑engineer acquaintance made to AASHTO radii. He also asked why references to the International Fire Code were being struck from a section of the draft.

Weier responded that any county decision on a request for relief would be referred to the relevant fire protection district for input and that the director's office would make the final determination on the county side; she said appeals of a director decision could be taken to the Board of County Commissioners. On sprinklers, Weier said her understanding — echoed by fire representatives present — is that sprinklers may not save a home from catastrophic wildfire but can provide occupants additional time to escape and additional time for responders to arrive. She said staff would review the commenter’s AASHTO concerns and the technical basis for the proposed radii.

Commission discussion emphasized the multiyear, multiagency process used to prepare the draft. Commissioners praised cross‑agency coordination, including work with about 14 fire protection districts that serve unincorporated Jefferson County, and several commissioners said they would support the changes. Commissioner Messner moved approval; Commissioner Spencer seconded. Kimmy Schillinger polled the commission and the motion passed unanimously.

Staff recommended approval and noted the amendments will be incorporated into a broader unified land use code update. The Planning Commission’s recommendation now goes to the Board of County Commissioners, which is the final authority and is scheduled to hear the package on June 10, 2025.