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Adams County approves Mellan pipeline conditional use permit and development agreement with safety and control conditions
Summary
The board approved a conditional use permit and a development agreement for the Mellan pipeline project, authorizing about five miles of a 235‑mile buried pipeline through unincorporated Adams County with conditions including integrity testing, remote shutdown, GIS as‑built data provision and county consent before any crude‑oil transport through the county.
Adams County commissioners voted Dec. 2 to approve a conditional use permit (RCU 2024‑46) and a development agreement allowing construction of a buried transportation‑fuel pipeline through approximately five miles of unincorporated Adams County as part of a larger 235‑mile pipeline project from Scott City, Kansas, to Denver International Airport.
County staff said the section in unincorporated Adams County would be a 10‑inch diameter buried line; an updated route submitted by the applicant shifted about one mile west of the original corridor, which staff said reduced impacts to floodplain and high‑priority habitat areas near the Box Elder Creek corridor and moved some alignments to the opposite side of affected parcels. Staff sent 81 notifications and reported 19 public comments during referral (five initial oppositions, 14 in support after outreach). Planning Commission reviewed the updated route and recommended approval 6–0.
The development agreement incorporated a set of mitigation and operational measures that staff and the applicant described in the hearing, including five‑year smart‑pig integrity testing, remote shutdown and scatter detection systems, pipeline coating and visual inspections, cathodic protection, as‑built GIS data provision to the county, and a provision that Mellan will not transport crude oil through Adams County without first obtaining county consent. The applicant also agreed to consider and negotiate reasonable encroachment agreements for private‑property crossings so long as they do not unreasonably interfere with safe pipeline operation, and to reimburse the county for costs incurred in connection with the pipeline.
Speakers at the hearing included project counsel and the applicant team, and a representative of United Airlines who urged the board to support the project and praised the county’s rigorous review process. Commissioners expressed frustration with route selection and the timeline for some materials but said the development agreement’s enforceable standards and commitments addressed many county concerns. The board moved, seconded and approved the conditional use permit and development agreement.
Why it matters: The pipeline is intended to deliver aviation and other transport fuels to Denver International Airport and regional customers; county approval enables construction in unincorporated Adams County subject to the development agreement’s mitigation and monitoring requirements.
What happens next: The permit and development agreement vest the county’s conditions; staff will enforce the development agreement terms and may call for a show‑cause hearing if compliance lapses. Mellan and its contractors will move into pre‑construction and permitting actions consistent with the agreement.
