- Source: San Juan basin
- Destination: Sumas, Washington
- Ownership: Williams
- Website: http://co.williams.com/
- Length: kilometres (4,000 miles)
- Capacity: 3.8 billion cubic feet per day
- Status: Operating
- The Northwest Pipeline system is a primary artery for the transmission of natural gas to the Pacific Northwest and Intermountain Region.
- It is a bi-directional transmission system crossing the states of Washington, Oregon, Idaho, Wyoming, Utah and Colorado.
- Northwest’s bi-directional system provides access to British Columbia, Alberta, Rocky Mountain and San Juan Basin gas supplies.
- Northwest Pipeline owns a one-third interest in the Jackson Prairie underground storage facility in Washington and contracts with a third party for storage service in the Clay basin underground field in Utah.
- The pipeline is connected to the White River Natural Gas Hub in Rio Blanco County, Colorado and the Opal Natural Gas Hub
- It interconnects with the TransWestern Gas Pipeline and the Paiute Gas Pipeline at the Idaho-Nevada border
- 1999 - South Mist Storage Link Phase III completed
- 2002 - Gray Harbor Lateral Completed
- 2003 - Ridges Basin Dam Project, Evergreen Expansion & Rockies Expansion completed
- 2004 - Everett Delta Lateral Completed
- 2006 - Capacity Replacement Project Completed
- 2007 - Parachute Expansion Completed
- 2008 - Connection made to White River Natural Gas Hub
- 2010 - Sundance Trail Expansion Project completes connection to Opal Natural Gas Hub
- North West Pipeline, Williams
- EIA Natural Gas Pipeline Projects 1996-1999
- EIA Natural Gas Pipeline Projects 2000-2009
- EIA Natural Gas Pipeline Projects 2010-2014
- Questar Pipeline and Enterprise Begin Operations of the White River Hub in Colorado
- Northwest Pipeline GP Completes Sundance Trail Expansion Project