**Exhibit 31.1****CERTIFICATIONS**I, Steven J. Malcolm, certify that:1. I have reviewed this annual report on Form 10-K of Williams Partners L.P.;2. Based on my knowledge, this report does not contain any untrue statement of amaterial fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances under which such statements were made, notmisleading with respect to the period covered by this report;3. Based on my knowledge, the financial statements, and other financialinformation included in this report, fairly present in all material respects thefinancial condition, results of operations and cash flows of the registrant asof, and for, the periods presented in this report;4. The registrant’s other certifying officer and I are responsible forestablishing and maintaining disclosure controls and procedures (as defined inExchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financialreporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for theregistrant and have: a) Designed such disclosure controls and procedures, or causedsuch disclosure controls and procedures to be designed under oursupervision, to ensure that material information relating to theregistrant, including its consolidated subsidiaries, is made known to usby others within those entities, particularly during the period in whichthis report is being prepared;  b) Designed such internal control over financial reporting, orcaused such internal control over financial reporting to be designed underour supervision, to provide reasonable assurance regarding the reliabilityof financial reporting and the preparation of financial statements forexternal purposes in accordance with generally accepted accountingprinciples;  c) Evaluated the effectiveness of the registrant’s disclosurecontrols and procedures and presented in this report our conclusions aboutthe effectiveness of the disclosure controls and procedures, as of the endof the period covered by this report based on such evaluation; and  d) Disclosed in this report any change in the registrant’sinternal control over financial reporting that occurred during theregistrant’s most recent fiscal quarter (the registrant’s fourth fiscalquarter in the case of an annual report) that has materially affected, oris reasonably likely to materially affect, the registrant’s internal controlover financial reporting; and5. The registrant’s other certifying officer and I have disclosed, based on ourmost recent evaluation of internal control over financial reporting, to theregistrant’s auditors and the audit committee of the registrant’s board ofdirectors (or persons performing the equivalent functions): a) All significant deficiencies and material weaknesses in thedesign or operation of internal control over financial reporting which arereasonably likely to adversely affect the registrant’s ability to record,process, summarize and report financial information; and  b) Any fraud, whether or not material, that involvesmanagement or other employees who have a significant role in theregistrant’s internal control over financial reporting.     Date: February 28, 2007        /s/ Steven J. Malcolm         Steven J. Malcolm    Chief Executive Officer of Williams Partners GP    LLC, general partner of Williams Partners L.P.    (Principal Executive Officer)