MountainWest Overthrust Pipeline

The best-positioned pipeline in the Rockies

NEWS: Williams Closes Acquisition of MountainWest Natural Gas Transmission and Storage Business.

On February 14, 2023, Williams announced that it has closed its acquisition of MountainWest Pipelines Holding Company from Southwest Gas Holding, Inc.
Read more about the acquisition.
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MountainWest Overthrust Pipeline is a 261–mile, mostly 36–inch diameter pipeline located in southwestern Wyoming with a total daily capacity of 2,400 Mdth. It provides transportation services for producers in the Green River, Overthrust, Wamsutter and other Rockies producing basins with interconnects to several major pipeline systems including Ruby Pipeline, Rockies Express Pipeline, MountainWest Pipeline, Kern River Gas Transmission, and Wyoming Interstate Company. The 43–mile loop between Kanda and Blacks Fork, completed in 2011, increased firm transportation capacity by up to 800 Mdth/d for deliveries to the west and by 50 MDth/d for deliveries to the east.  With its interconnections to multiple long–haul pipelines, MountainWest Overthrust Pipeline is designed to deliver clean natural gas to both eastern and western markets providing shippers with multiple market opportunities.