ONEOK Partners owns a 49% interest in Bighorn Gas Gathering L.L.C., a 37% interest in Fort Union Gas Gathering, L.L.C. and a 35% interest in Lost Creek Gathering, L.L.C., through its wholly-owned subsidiary, Crestone Energy Ventures, L.L.C., which collectively own more than 400 miles of gas gathering facilities in the Powder River and Wind River Basins in Wyoming.

Bighorn Gas Gathering
The remaining ownership interest in Bighorn Gas Gathering, a gathering system under development in the Powder River Basin, is held by Copano Energy, which is the project manager and operator. The Bighorn system is managed by a Management Committee consisting of representatives of the owners.

Bighorn, which began service in December 1999, is a major coalbed methane gathering project serving a broad production area in Northeast Wyoming. The Bighorn system consists of 43 compressor stations and approximately 210 miles of gathering lines, located southwest of Gillette, Wyoming, to north of Spotted Horse, Wyoming and west to Sheridan, Wyoming. This system is capable of gathering more than 250 million cubic feet per day (MMCf/d) of coalbed methane gas for delivery to the Fort Union Gas Gathering system.  Under various agreements, producers have dedicated their reserves to Bighorn, giving Bighorn the right to gather coalbed methane gas produced in areas of Wyoming covering approximately 830,000 acres.

Fort Union Gas Gathering
Copano Energy, Anadarko Petroleum and Bargath, Inc. hold the remaining ownership interests in Fort Union Gas Gathering, which is located in Northeast Wyoming. Copano Energy is the managing member, Western Gas (a subsidiary of Anadarko Petroleum) is the operator and Crestone is the Administrative Manager.

The Fort Union system gathers coalbed methane gas produced in the Powder River Basin. Fort Union's facilities include a gathering trunk line with 106 miles of pipeline extending from Gillette, Wyoming, to Glenrock, Wyoming and a treatment plant to extract carbon dioxide (CO₂). The Fort Union system is capable of delivering more than 635 MMcf/d of natural gas into the interstate pipeline grid.

In January 2007, Fort Union announced that it will double its existing gathering capacity by adding 148 miles of new gathering lines resulting in approximately 649 MMcf/d of additional capacity. The expansion will occur in two phases. Phase 1, with more than 200 MMcf/d capacity, was placed into service during the fourth quarter of 2007. Phase 2, with approximately 450 MMcf/d, is currently expected to be in service during the second quarter 2008.

Lost Creek Gathering
Burlington Resources Trading, Inc. (a subsidiary of ConocoPhillips) holds the remaining interest in Lost Creek Gathering system, which gathers natural gas produced from conventional wells in the Wind River Basin located in Central Wyoming. Burlington is the managing member, a subsidiary of Crestone Energy Ventures is the administrative manager and an unaffiliated third party, Elkhorn Field Services, is the operator.

The Lost Creek system consists of approximately 120 miles of gathering header and a compressor station with 5,000 horsepower of electric compression. Operational since August 2000, the Lost Creek system is capable of delivering more than 275 MMCf/d into the interstate pipeline grid.