SIXTH AMENDMENT TO CREDIT AGREEMENT

Exhibit 10.1

EXECUTION VERSION

SIXTH AMENDMENT TO CREDIT AGREEMENT

     This SIXTH AMENDMENT TO CREDIT AGREEMENT (this “Amendment”) is dated as of September 30, 2009, among GASCO ENERGY, INC. (“Borrower”), CERTAIN SUBSIDIARIES OF BORROWER, as Guarantors (the “Guarantors”), the LENDERS party hereto (the “Lenders”), and JPMORGAN CHASE BANK, N.A., as Administrative Agent (“Administrative Agent”). Unless the context otherwise requires or unless otherwise expressly defined herein, capitalized terms used but not defined in this Amendment have the meanings assigned to such terms in the Credit Agreement (as defined below).

WITNESSETH:

     WHEREAS, the Borrower, the Guarantors, the Administrative Agent and the Lenders have entered into that certain Credit Agreement dated as of March 29, 2006 (as the same has been and may hereafter be amended, restated, supplemented or otherwise modified from time to time, the “Credit Agreement”); and

     WHEREAS, the Borrower, the Guarantors, the Administrative Agent and the Lenders desire to amend the Credit Agreement as provided herein upon the terms and conditions set forth herein.

     NOW, THEREFORE, for and in consideration of the mutual covenants and agreements herein contained and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged and confessed, the Borrower, the Guarantors, the Lenders and the Administrative Agent hereby agree as follows:

SECTION 1. Amendments to Credit Agreement. Subject to the satisfaction or waiver in writing of each condition precedent set forth in Section 2 of this Amendment, and in reliance on the representations, warranties, covenants and agreements contained in this Amendment, the Credit Agreement shall be amended in the manner provided in this Section 1 effective as of the date Borrower satisfies the conditions set forth in Section 2 of this Amendment.

     1.1 Mandatory Prepayment of Loans. Clause (a) of Section 2.10 of the Credit Agreement shall be and it hereby is amended and restated in its entirety to read as follows:

     (a) Except as otherwise provided in Section 2.10(b), in the event a Borrowing Base Deficiency exists, the Borrower shall, within thirty (30) days (or in the case of a Borrowing Base Deficiency arising from or related to the Scheduled Redetermination of the Borrowing Base on or about November 1, 2009, within fifteen (15) days) after written notice from the Administrative Agent to the Borrower of such Borrowing Base Deficiency, notify the Administrative Agent which of the following actions it will take to eliminate such Borrowing Base Deficiency and within sixty (60) days (or in the case of a Borrowing Base Deficiency arising from or related to the Scheduled Redetermination of the Borrowing Base on or about November 1, 2009, within thirty (30) days) after such notice from the Administrative Agent (a) by instruments satisfactory in form and substance to the Required Lenders, provide the Lenders with additional security consisting of Oil and Gas Interests with value and quality satisfactory to

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the Lenders in their sole discretion to eliminate such Borrowing Base Deficiency, (b) prepay, without premium or penalty, the principal amount of the Loans in an amount sufficient to eliminate such Borrowing Base Deficiency or (c) by a combination of such additional security and such prepayment eliminate such Borrowing Base Deficiency.

     1.2 Special Redeterminations. The first sentence of Section 3.03 of the Credit Agreement shall be and it hereby is amended and restated in its entirety to read as follows:

     In addition to Scheduled Redeterminations, (a) the Borrower shall be permitted to request a Special Redetermination of the Borrowing Base once between each Scheduled Redetermination and (b) the Required Lenders shall be permitted to request a Special Redetermination of the Borrowing Base once between each Scheduled Redetermination.

SECTION 2. Conditions. The amendments to the Credit Agreement contained in Section 1 of this Amendment shall be effective upon the satisfaction of each of the conditions set forth in this Section 2.

     2.1 Execution and Delivery. Each Credit Party, the Required Lenders and the Administrative Agent shall have executed and delivered this Amendment and any other required document, all in form and substance satisfactory to Administrative Agent.

     2.2 No Default. No Default shall have occurred and be continuing or shall result from the effectiveness of this Amendment.

     2.3 Other Documents. The Administrative Agent shall have received such other instruments and documents incidental and appropriate to the transaction provided for herein as the Administrative Agent or its special counsel may reasonably request prior to the date hereof, and all such documents shall be in form and substance reasonably satisfactory to the Administrative Agent.

SECTION 3. Representations and Warranties of the Credit Parties. To induce the Lenders to enter into this Amendment, each Credit Party hereby represents and warrants to the Administrative Agent and the Lenders as follows:

     3.1 Reaffirmation of Representations and Warranties/Further Assurances. After giving effect to the amendments herein, each representation and warranty of such Credit Party contained in the Credit Agreement or in any other Loan Document is true and correct in all material respects on the date hereof (except to the extent such representations and warranties relate solely to an earlier date, in which case, such representations and warranties are true and correct as of such earlier date).

     3.2 Corporate Authority; No Conflicts. The execution, delivery and performance by such Credit Party of this Amendment and all documents, instruments and agreements contemplated herein are within such Credit Party’s corporate or other organizational powers, have been duly authorized by all necessary action, require no action by or in respect of, or filing with, any court or agency of government and do not violate or constitute a default under any

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provision of any applicable law or other agreements binding upon such Credit Party or result in the creation or imposition of any Lien upon any of the assets of such Credit Party except for Liens permitted under Section 7.02 of the Credit Agreement.

     3.3 Enforceability. This Amendment constitutes the valid and binding obligation of such Credit Party enforceable in accordance with its terms, except as (i) the enforceability thereof may be limited by bankruptcy, insolvency or similar laws affecting creditor’s rights generally, and (ii) the availability of equitable remedies may be limited by equitable principles of general application.

     3.4 No Default. As of the date hereof, both before and immediately after giving effect to this Amendment, no Default has occurred and is continuing.

SECTION 4. Miscellaneous.

     4.1 Reaffirmation of Loan Documents and Liens. Any and all of the terms and provisions of the Credit Agreement and the Loan Documents shall, except as amended and modified hereby, remain in full force and effect and are hereby in all respects ratified and confirmed by each Credit Party. Each Credit Party hereby agrees that the amendments and modifications herein contained shall in no manner affect or impair the liabilities, duties and obligations of any Credit Party under the Credit Agreement and the other Loan Documents or the Liens securing the payment and performance thereof.

     4.2 Parties in Interest. All of the terms and provisions of this Amendment shall bind and inure to the benefit of the parties hereto and their respective successors and assigns.

     4.3 Legal Expenses. Each Credit Party hereby agrees to pay all reasonable fees and expenses of special counsel to the Administrative Agent incurred by the Administrative Agent in connection with the preparation, negotiation and execution of this Amendment and all related documents.

     4.4 Counterparts. This Amendment may be executed in one or more counterparts and by different parties hereto in separate counterparts each of which when so executed and delivered shall be deemed an original, but all such counterparts together shall constitute but one and the same instrument; signature pages may be detached from multiple separate counterparts and attached to a single counterpart so that all signature pages are physically attached to the same document. Delivery of photocopies of the signature pages to this Amendment by facsimile or electronic mail shall be effective as delivery of manually executed counterparts of this Amendment.

     4.5 Complete Agreement. THIS AMENDMENT, THE CREDIT AGREEMENT, AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

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     4.6 Headings. The headings, captions and arrangements used in this Amendment are, unless specified otherwise, for convenience only and shall not be deemed to limit, amplify or modify the terms of this Amendment, nor affect the meaning thereof.

     4.7 Governing Law. This Amendment shall be construed in accordance with and governed by the law of the State of Texas.

[Signature Pages Follow]

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     IN WITNESS WHEREOF, the parties have caused this Sixth Amendment to Credit Agreement to be duly executed as of the date first above written.

SixthAmendment to Credit Agreement — Signature Page

SixthAmendment to Credit Agreement — Signature Page

SixthAmendment to Credit Agreement — Signature Page