Inspectioncurrent
NPMS FIPS 30111 / OPID 31632
NORTHWESTERN CORPORATION — Yellowstone County, MT
Current as of source date Government source
Pipeline and Hazardous Materials Safety AdministrationOfficial agency material
View source Yellowstone County, MTNORTHWESTERN CORPORATION (PHMSA OPID 31632) reported 68.074223 active Natural Gas pipeline miles in Yellowstone County, MT (county FIPS 30111) in the public NPMS summary snapshot dated 2026-07-16. The snapshot includes active assets only and excludes permanently abandoned assets. Exact pipeline locations and restricted NPMS GIS data are not included.#