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Facilities

The Mist Underground Natural Gas Storage Facility consists of underground natural gas storage reservoirs, compressor stations, gathering pipelines, operations and maintenance facilities, and a gas transmission pipeline. The permitted storage area is approximately 5,472 acres and has a permitted daily natural gas throughput of 635 million standard cubic feet.
Operating. The North Mist Expansion Project, approved by Council in April 2016 through Amendment 11, started construction in 2017. Major construction was completed in May 2019 and the facility is operational.

On May 2, 2023, the Department received an Amendment Determination Request (ADR) from the certificate holder for the installation of a section (approximately 2,000 feet) of the existing Flora Well pipeline adjacent to the mainline road at the facility, within areas approved in the existing approved Site Certificate. On July 14, 2023, the Department determined that the circumstances described do not require an amendment to the twelfth Amended Site Certificate. The ADR, and the Departments evaluation and determination are posted in the project timeline below.

Columbia County, near the community of Mist. PDF Map | Online Map
Applicant/Certificate holder: Northwest Natural Gas Company
Applicant/Certificate holder contact: Andy Bauer
ODOE contact: Chase McVeigh-Walker
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Project Timeline

  
Additional Documents
  
02/05/1981
06/19/1981
09/30/1981
02/12/1987
10/06/1987
10/29/1987
03/24/1988
10/02/1988
08/03/1990
09/21/1990
03/20/1997
07/21/1997
07/21/1997
08/04/1997
Request for Amendment 5

​Do​cument not available

02/27/1998
03/13/1998
03/17/1998
09/15/1998
03/30/1999
04/20/1999
08/29/2000
11/27/2000
12/12/2000
08/16/2001
11/14/2001
11/14/2001
09/12/2003
12/05/2003
12/08/2003
06/11/2007
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Exhibit Files Reference

  • Exhibit A: Applicant Information 
  • Exhibit B: Project Description
  • Exhibit C: Property Location and Maps
  • Exhibit D: Organizational Information
  • Exhibit E​: Permits Required
  • Exhibit F: Property Ownership 
  • Exhibit G: Materials Analysis
  • Exhibit H: Geology and Soil Stability 
  • Exhibit I: Soils
  • Exhibit J: Wetlands
  • Exhibit K: Land Use
  • Exhibit L: Protected Areas
  • Exhibit M: Financial Analysis
  • Exhibit N​: Non-generating Facility Information
  • Exhibit O: Water Requirements
  • Exhibit P: Fish Wildlife Habitat 
  • Exhibit Q: Threatened and Endangered Plants and Animals
  • Exhibit R: Scenic Aesthetic Values 
  • Exhibit S: Cultural Resources
  • Exhibit T: Recreational Facilities 
  • Exhibit U: Public Services
  • Exhibit V​: Waste Minimization 
  • Exhibit W: Site Restoration
  • Exhibit X: Noise 
  • Exhibit Y: Carbon Dioxide Emissions 
  • Exhibit Z: Cooling Towers  
  • Exhibit AA: EMFs – Electric and Magnetic Fields
  • Exhibit BB: Other Information
  • Exhibit CC: Additional Statutes Rules Ordinances
  • Exhibit DD​: Other Specific Standards