|   | (Date      of report)                  | July      23, 2010 |
|--------|----------------------------------------|--------------------|
|   | (Date      of earliest event reported) | July      22, 2010 |

| Delaware                          |   | 1-12202           |   | 93-1120873               |
|-----------------------------------|--------|-------------------|--------|--------------------------|
| (State      or other jurisdiction |   | (Commission       |   | (IRS      Employer       |
| of      incorporation)            |   | File      Number) |   | Identification      No.) |

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| Item 8.01 | Other Events                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
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|      |  On July 22, 2010, we      announced that we received notification that Williams Partners L.P. has      elected to exercise its option to increase its ownership of Overland Pass      Pipeline Company, LLC to 50 percent from 1 percent.The      joint-venture company was established in May 2006 to build the Overland      Pass Pipeline, a 760-mile natural gas liquids (NGL) pipeline from Opal,      Wyo., to the Mid-Continent natural gas liquids market center in Conway,      Kan., one of the nation’s primary NGL distribution and storage      hubs.  Currently, we own 99 percent of the joint venture and      Williams owns the remaining 1 percent.The      pipeline, which went into service in November 2008, can transport      approximately 140,000 barrels per day with the ability to expand capacity      to 255,000 barrels per day with additional pump facilities.Upon      closing of the transaction and as long as Williams owns at least 50      percent of Overland Pass Pipeline Company, Williams will have the option      to become the operator by providing us at least 30 days      notice.The      transaction is expected to be completed in August 2010, subject to      obtaining the necessary regulatory approvals.As      a result of the increase in Williams’ ownership in the joint-venture      company, we will receive approximately $425 million at closing in      accordance with the joint venture’s operating agreement.  We      will use the proceeds from the transaction to repay short-term debt and to      fund our recently announced capital projects.  |
| Item 9.01 | Financial Statements and      Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|      |  Exhibits                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|      | 99.1      News      release issued by ONEOK Partners, L.P. dated July 22,  2010.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
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|   |               |   | ONEOK      Partners, L.P.By:  ONEOK      Partners GP, L.L.C., General      Partner |
|--------|--------------------|--------|----------------------------------------------------------------------------------------------|
|   |               |   |                                                                                         |
| Date:  | July      23, 2010 | By:    | /s/ Curtis L. Dinan                                                                          |
|   |               |   | Senior Vice      President -Chief      Financial Officerand      Treasurer              |
|   |               |   |                                                                                         |