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Rock Springs Field Office
Release Date: 06/09/14
Contacts: Shelley Gregory    

BLM Opens Scoping for Riley Ridge to Natrona Pipeline

The Bureau of Land Management (BLM) Rock Springs Field Office is seeking public comment on a proposal to construct approximately 243 miles of pipeline through Fremont, Sublette, Sweetwater and Natrona counties, Wyo.

A Notice of Intent for the proposed two-segment pipeline project published in the Federal Register today to initiate a 30-day public scoping period in preparation for an environmental impact statement (EIS).

The Riley Ridge segment would include 31 miles of 16-inch pipeline transporting liquid hydrogen sulfide (H2S) and carbon dioxide (CO2) from the existing Riley Ridge Treating Plant located 18 miles southwest of Big Piney, Wyo., to a proposed sweetening plant to be located 12 miles northeast of LaBarge, Wyo. From the sweetening plant, a 24-inch pipeline would transport liquid CO2 129 miles through Sublette and Sweetwater counties to the Bairoil Interconnect located 50 miles northwest of Rawlins, Wyo.

The Bairoil to Natrona segment would include 83 miles of 24-inch pipeline transporting liquid CO2 from the Bairoil Interconnect through Fremont and Natrona counties to the Greencore Pipeline at the Natrona Hub 30 miles west of Casper, Wyo.

A 75-foot-wide right-of-way (ROW) for construction and a permanent 50-foot-wide ROW for operation and maintenance are proposed for the 16-inch pipeline segment. A 100-foot-wide ROW for construction and a permanent 50-foot-wide ROW for operation and maintenance are proposed for the 24-inch pipeline segments.

The project would include the proposed sweetening plant where H2S would be separated from the CO2 stream and injected into a deep geological formation via two proposed adjacent H2S injection wells.

The proposal and associated documents can be reviewed at the Rock Springs Field Office, 280 Hwy. 191 N., Rock Springs, Wyo., or online at

The Rock Springs Field Office will host four public scoping meetings in Casper, Lander, Big Piney and Rock Springs. Dates and locations will be announced soon.

Public comments are a key component of the EIS process and help to identify specific issues, concerns, ideas and mitigation opportunities that assist the BLM in developing the most realistic range of alternative actions and the most comprehensive environmental impact analysis. Substantive comments relating directly to this proposal and impending EIS should be emailed to with “Public Comment” in the subject line; faxed to 307-352-0329; or mailed or delivered to the BLM, Attn: Stephanie Anderson, 280 Hwy. 191 N., Rock Springs WY 82901. Comments will be accepted until July 9.

Before including your address, phone number, e-mail address, or other personal identifying information in your comment, be advised that your entire comment – including your personal identifying information – may be made publicly available at any time. While you may ask us in your comment to withhold from public review your personal identifying information, we cannot guarantee that we will be able to do so.

For more information, please contact Jim Stobaugh at 775-861-6478.

Persons who use a telecommunications device for the deaf (TDD) may call the Federal Information Relay Service (FIRS) at 1-800-877-8339 to contact the individual listed above during normal business hours. The FIRS is available 24 hours a day, 7 days a week, to leave a message or question with the below individual. You will receive a reply during normal business hours.

The BLM manages more than 245 million acres of public land, the most of any Federal agency. This land, known as the National System of Public Lands, is primarily located in 12 Western states, including Alaska. The BLM also administers 700 million acres of sub-surface mineral estate throughout the nation. The BLM's mission is to sustain the health, diversity, and productivity of America’s public lands for the use and enjoyment of present and future generations. In Fiscal Year 2015, the BLM generated $4.1 billion in receipts from activities occurring on public lands.

Rock Springs Field Office   280 Highway 191 North      Rock Springs, WY 82901  

Last updated: 06-09-2014