Amended and Restated Guaranty Agreement dated February 4, 2021, by and among Crimson Midstream Operating, LLC, Corridor MoGas, Inc., Crimson Midstream Holdings, LLC, MoGas Debt Holdco LLC, MoGas Pipeline, LLC, CorEnergy Pipeline Company, LLC, United Property Systems, LLC, Crimson Pipeline, LLC, and Cardinal Pipeline, L.P., the lenders from time to time party thereto and Wells Fargo Bank, National Association, as Administrative Agent

This AMENDED AND RESTATED GUARANTY AGREEMENT, dated as of February 4, 2021 (as amended, restated, amended and restated, supplemented or otherwise modified from time to time, this “Guaranty”), is executed by Crimson Midstream Operating, LLC, a Delaware limited liability company (“Crimson Operating”), Corridor MoGas, Inc., a Delaware corporation (“Corridor MoGas” and, along with Crimson Operating, each a “Borrower” and collectively the “Borrowers”), Crimson Midstream Holdings, LLC, a Delaware limited liability company (“Holdings”), MoGas Debt HoldCo LLC, a Delaware limited liability company (“MoGas HoldCo”), Crimson Pipeline, LLC, a California limited liability company (“Crimson Pipeline”), Cardinal Pipeline, L.P., a California limited partnership (“Cardinal Pipeline”), MoGas Pipeline LLC, a Delaware limited liability company (“MoGas Pipeline”), CorEnergy Pipeline Company, LLC, a Delaware limited liability company (“CorEnergy Pipeline”), United Property Systems, LLC, a Delaware limited liability company (“United Property” and, together with the Borrowers, Holdings, MoGas HoldCo, Crimson Pipeline, Cardinal Pipeline, MoGas Pipeline, CorEnergy Pipeline and each other guarantor from time to time party hereto, the “Guarantors”) in favor of Wells Fargo Bank, National Association, as Administrative Agent for the ratable benefit of the Secured Parties.

A.This Guaranty is entered into in connection with that certain Amended and Restated Credit Agreement dated as of the date hereof (as amended, restated, amended and restated, supplemented or otherwise modified from time to time, the “Credit Agreement”), among the Borrowers, the Guarantors party thereto from time to time, the lenders party thereto from time to time (individually, a “Lender” and collectively, the “Lenders”), Wells Fargo Bank, National Association, as administrative agent (in such capacity, the “Administrative Agent”), as swingline lender (in such capacity, the “Swingline Lender”) and as issuing bank (in such capacity, the “Issuing Bank”), and the other parties from time to time party thereto, which amended and restated that certain Credit Agreement dated as of February 19, 2016 among Crimson Midstream, Crimson Pipeline, Cardinal Pipeline, Parent, Crimson Gulf, LLC, a Delaware limited liability company, Crimson Jolliet, LLC, a Delaware limited liability company, Crimson Louisiana Pipeline, LLC, a Delaware limited liability company, Wells Fargo Bank, National Association, as administrative agent (in such capacity, the “Existing Administrative Agent”, and the lenders and other parties thereto (as amended, supplemented or otherwise modified prior to the Closing Date, the “Existing Credit Agreement”).

B.Pursuant to the Existing Credit Agreement, certain of the Guarantors, Crimson Operating, Holdings and the Existing Administrative Agent entered into that certain Guaranty Agreement dated as of February 19, 2016 (as amended, restated, amended and restated, replaced, modified and/or supplemented prior to the date hereof, the “Existing Guaranty Agreement”) to secure the Existing Obligations (as hereinafter defined).

C.Crimson Operating has requested that the “Obligations” (as defined in the Existing Credit Agreement, herein, the “Existing Obligations”) be bifurcated to reflect the separation of certain operations and entities in the Gulf of Mexico (and the State of Louisiana) and the State of California, with a portion of the Existing Obligations being allocated to the

Borrowers and the Guarantors and a portion of the Existing Obligations being allocated to Crescent Midstream Operating, LLC (the “Louisiana Borrower”), Crescent Midstream Holdings, LLC, and the Louisiana Borrower’s Subsidiaries (collectively, the “Louisiana Loan Parties”).

A.To bifurcate the Existing Obligations, the Louisiana Loan Parties will become a party to that certain Amended and Restated Credit Agreement, dated as of the Closing Date, by and among the Louisiana Loan Parties, JPMorgan Chase Bank, N.A., as administrative agent, the lenders and other parties thereto, which shall amend and restate that portion of the Existing Credit Agreement which relate to the rights and obligations of the Louisiana Loan Parties (the “Amended and Restated Louisiana Credit Agreement”), which shall be secured by certain of the Louisiana Loan Parties pursuant to an Amended and Restated Security Agreement dated as of the date hereof (the “Amended and Restated Louisiana Guaranty Agreement”).

B.Certain of the Loan Parties and/or their Subsidiaries have entered into, or may hereafter enter into, Hedge Contracts with Swap Counterparties.

C.Certain of the Loan Parties have entered into, or may hereafter enter into, certain agreements relating to Banking Services with certain Banking Service Providers.

D.Each Guarantor is an affiliate of a Borrower and will derive substantial direct and indirect benefits from (i) the transactions contemplated by the Credit Agreement and the other Loan Documents, (ii) the Hedge Contracts entered into by the Loan Parties and/or their Subsidiaries with a Swap Counterparty, and (iii) the Banking Services provided to the Loan Parties by any Banking Service Provider.

E.Each Guarantor is executing and delivering this Guaranty (i) to induce the Lenders to provide Advances under the Credit Agreement, (ii) to induce the Swingline Lender to provide Swingline Loans under the Credit Agreement, (iii) to induce the Issuing Bank to provide Letters of Credit under the Credit Agreement, (iv) to induce the Swap Counterparties to enter into transactions with the Loan Parties and/or their Subsidiaries under their respective Hedge Contracts, (v) to induce the Banking Service Providers to provide Banking Services to the Loan Parties, and (vi) intending it to be a legal, valid, binding, enforceable and continuing obligation of each Guarantor, whether or not such Guarantor derives any benefit from the Credit Agreement, from any other Loan Document, from any Hedge Contract or from any Banking Services.

NOW, THEREFORE, in consideration of the foregoing and other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged and confessed, each Guarantor hereby agrees as follows:

Section 1. Definitions. All capitalized terms not otherwise defined in this Guaranty that are defined in the Credit Agreement shall have the meanings assigned to such terms in the Credit Agreement.

acceleration or otherwise, of (i) all Obligations, whether absolute or contingent and whether for principal, interest (including, without limitation, interest that but for the existence of a bankruptcy, reorganization or similar proceeding would accrue), fees, amounts owing in respect of Letter of Credit Exposure, obligations to provide cash collateral, indemnities, expenses or otherwise (collectively, the “Guaranteed Obligations”). Without limiting the generality of the foregoing, each Guarantor’s liability shall extend to all amounts that constitute part of the Guaranteed Obligations and would be owed by the Loan Parties but for the fact that they are unenforceable or not allowable due to insolvency or the existence of a bankruptcy, reorganization or similar proceeding involving any Loan Party or any Subsidiary of any Loan Party.

a.Anything contained in this Guaranty to the contrary notwithstanding, the obligations of each Guarantor under this Guaranty on any date shall be limited to a maximum aggregate amount equal to the largest amount that would not, on such date, render its obligations hereunder subject to avoidance as a fraudulent transfer or conveyance under Section 548 of the Bankruptcy Code of the United States or any applicable provisions of comparable laws relating to bankruptcy, insolvency, or reorganization, or relief of debtors (collectively, the “Fraudulent Transfer Laws”), but only to the extent that any Fraudulent Transfer Law has been found in a final non-appealable judgment of a court of competent jurisdiction to be applicable to such obligations as of such date, in each case:

i.after giving effect to all liabilities of each Guarantor, contingent or otherwise, that are relevant under the Fraudulent Transfer Laws, but specifically excluding:

1.any liabilities of such Guarantor in respect of intercompany Debt to any Borrower or other affiliates of such Borrower to the extent that such Debt would be discharged in an amount equal to the amount paid by such Guarantor hereunder; and

ii.after giving effect as assets to the value (as determined under the applicable provisions of the Fraudulent Transfer Laws) of any rights to subrogation, reimbursement, indemnification or contribution of such Guarantor pursuant to applicable law or pursuant to the terms of any agreement.

Section 3. Guaranty Absolute. Each Guarantor guarantees that the Guaranteed Obligations will be paid strictly in accordance with the terms of the Loan Documents, the applicable Hedge Contracts between any Loan Party and/or any Subsidiary of a Loan Party and a Swap Counterparty, and any agreement or instrument between any Loan Party and any Banking Service Provider relating to any Banking Services, regardless of any law, regulation or order now or hereafter in effect in any jurisdiction affecting any of such terms or the rights of any Secured Party with respect thereto. The obligations of each Guarantor under this Guaranty are independent of the obligations of any other Person under the Loan Documents, in connection with any Hedge Contracts between any Loan Party and/or any Subsidiary of a Loan Party and a Swap Counterparty, or any agreement or instrument between any Loan Party and any Banking Service Provider relating to any Banking Services, and a separate action or actions may be brought and prosecuted against any Guarantor to enforce this Guaranty, irrespective of whether

any action is brought against any Borrower or any other Person or whether any Borrower or any other Person are joined in any such action or actions. The liability of each Guarantor under this Guaranty shall be irrevocable, absolute and unconditional irrespective of, and each Guarantor hereby irrevocably waives any defenses it may now or hereafter have in any way relating to, any or all of the following:

(a)any lack of validity or enforceability of any Loan Document, any Hedge Contract between any Loan Party and/or any Subsidiary of a Loan Party and a Swap Counterparty, any agreement or instrument between any Loan Party and any Banking Service Provider relating to any Banking Services or instrument relating thereto or any part of the Guaranteed Obligations being irrecoverable;

(b)any change in the time, manner or place of payment of, or in any other term of, all or any of the Guaranteed Obligations or any other obligations of any Person under the Loan Documents, any agreement or instrument relating to any Hedge Contract between any Loan Party and/or any Subsidiary of a Loan Party and a Swap Counterparty, an any agreement or instrument between any Loan Party and any Banking Service Provider relating to any Banking Services, or any other amendment or waiver of or any consent to departure from any Loan Document, any agreement or instrument relating to any Hedge Contract between any Loan Party and/or any Subsidiary of a Loan Party and a Swap Counterparty or any agreement or instrument between any Loan Party and any Banking Service Provider relating to any Banking Services, including, without limitation, any increase in the Guaranteed Obligations resulting from the extension of additional credit to any Borrower or otherwise;

(c)any taking, exchange, release or non-perfection of any collateral, or any taking, release or amendment or waiver of or consent to departure from any other guaranty, for all or any of the Guaranteed Obligations;

(d)any manner of application of collateral, or proceeds thereof, to all or any of the Guaranteed Obligations, or any manner of sale or other disposition of any collateral for all or any of the Guaranteed Obligations or any other obligations of any other Person under any Loan Document, any Hedge Contract between any Loan Party and/or any Subsidiary of a Loan Party and a Swap Counterparty, any agreement or instrument between any Loan Party and any Banking Service Provider relating to any Banking Services or any other assets of the Loan Parties or any of their Subsidiaries;

(e)any change, restructuring or termination of the corporate structure or existence of the Loan Parties or any of their Subsidiaries;

(f)any failure of any Secured Party to disclose to the Borrowers or any Guarantor any information relating to the business, condition (financial or otherwise), operations, properties or prospects of any Person now or in the future known to any Secured Party (and each Guarantor hereby irrevocably waives any duty on the part of any Secured Party to disclose such information);

a.any other circumstance or any existence of or reliance on any representation by any Secured Party that might otherwise constitute a defense available to, or a discharge of, the Borrower, any Guarantor or any other guarantor, surety or other Person.

Section 4. Continuation and Reinstatement, Etc. Each Guarantor agrees that, to the extent that payments of any of the Guaranteed Obligations are made, or any Secured Party receives any proceeds of collateral, and such payments or proceeds or any part thereof are subsequently invalidated, declared to be fraudulent or preferential, set aside, or otherwise required to be repaid, then to the extent of such repayment the Guaranteed Obligations shall be reinstated and continued in full force and effect as of the date such initial payment or collection of proceeds occurred.

(a)Each Guarantor hereby waives promptness, diligence, presentment, notice of acceptance and any other notice with respect to any of the Guaranteed Obligations and this Guaranty and any requirement that any Secured Party protect, secure, perfect or insure any Lien or any Property or exhaust any right or take any action against any Borrower or any other Person or any collateral.

(b)Each Guarantor hereby irrevocably waives any right to revoke this Guaranty, and acknowledges that this Guaranty is continuing in nature and applies to all Guaranteed Obligations, whether existing now or in the future.

(c)Each Guarantor acknowledges that it will receive substantial direct and indirect benefits from the financing arrangements involving the Borrowers contemplated by the Loan Documents, any Hedge Contracts between any Loan Party and/or any Subsidiary of a Loan Party and a Swap Counterparty, and any Banking Services provided to the Loan Parties or any of their Subsidiaries, and that the waivers set forth in this Guaranty are knowingly made in contemplation of such benefits.

(a)Each Guarantor will not exercise any rights that it may now have or hereafter acquire against any Borrower or any other Person to the extent that such rights arise from the existence, payment, performance or enforcement of such Guarantor’s obligations under this Guaranty or any other Loan Document, any between any Loan Party and/or any Subsidiary of a Loan Party and a Swap Counterparty, or any agreement or instrument between any Loan Party and any Banking Service Provider relating to any Banking Services, including, without limitation, any right of subrogation, reimbursement, exoneration, contribution or indemnification and any right to participate in any claim or remedy of any Secured Party against any Borrower or any other Person, whether or not such claim, remedy or right arises in equity or under contract, statute or common law, including, without limitation, the right to take or receive from any Borrower or any other Person, directly or indirectly, in cash or other property or by setoff or in any other manner, payment or security on account of such claim, remedy or right, unless and until the occurrence of Security Termination. If any amount shall be paid to any Guarantor in violation of the preceding sentence at any time prior to the occurrence of Security Termination,

such amount shall be held in trust for the benefit of the Secured Parties and shall forthwith be paid to the Administrative Agent to be credited and applied to the Guaranteed Obligations and any and all other amounts payable by any Guarantor under this Guaranty, whether matured or unmatured, in accordance with the terms of the Loan Documents.

a.Each Guarantor hereby agrees that the payment of any and all Debt now or hereafter owing to such Guarantor by the Borrowers (herein collectively called the “Subordinated Debt”) is and will be subordinate and junior in right of payment and enforcement to the prior payment and enforcement in full of the Obligations. Whenever any Event of Default exists, the Administrative Agent may, in its sole discretion, give notice to the Borrowers and the Guarantors that no payment shall be made or accepted on any Subordinated Debt, and upon receipt of such notice the Guarantors will not make or receive any payment on Subordinated Debt unless and until the occurrence of Security Termination, all Events of Default are waived or cured, or the Administrative Agent consents to such payment. In addition, whenever any Event of Default exists no Guarantor will exercise or enforce any creditors’ rights or remedies that it may have against any other Loan Party or any of its or their Subsidiaries, or foreclose, repossess, sequester, or otherwise institute any action or proceeding (whether judicial or otherwise, including the commencement of any insolvency proceeding) to enforce any Subordinated Debt until the occurrence of Security Termination, all Events of Default are waived or cured, or the Administrative Agent otherwise consents.

(a)There are no conditions precedent to the effectiveness of this Guaranty. Each Guarantor benefits from executing this Guaranty.

(b)Each Guarantor has, independently and without reliance upon any Secured Party and based on such documents and information as it has deemed appropriate, made its own credit analysis and decision to enter into this Guaranty, and each Guarantor has established adequate means of obtaining from the Borrowers and each other relevant Person on a continuing basis information pertaining to, and is now and on a continuing basis will be completely familiar with, the business, condition (financial and otherwise), operations, properties and prospects of the Borrowers and each other relevant Person.

(c)The obligations of each Guarantor under this Guaranty are the valid, binding and legally enforceable obligations of each Guarantor (except as limited by (i) applicable bankruptcy, insolvency, reorganization, moratorium, or similar laws at the time in effect affecting the rights of creditors generally and (ii) general principles of equity whether applied by a court of law or equity) and the execution and delivery of this Guaranty by each Guarantor has been duly and validly authorized in all respects by such Guarantor, and the Person who is executing and delivering this Guaranty on behalf of each Guarantor has full power, authority and legal right to so do, and to observe and perform all of the terms and conditions of this Guaranty on such Guarantor’s part to be observed or performed.

and any other Secured Party is hereby authorized at any time, to the fullest extent permitted by law, to set off and apply any deposits (general or special, time or demand, provisional or final) and other Debt owing by such Secured Party to the account of each Guarantor against any and all of the obligations of such Guarantor under this Guaranty, irrespective of whether or not such Secured Party shall have made any demand under this Guaranty and although such obligations may be contingent and unmatured. Such Secured Party shall promptly notify the applicable Guarantor after any such set-off and application is made, provided that the failure to give such notice shall not affect the validity of such set-off and application. The rights of the Secured Parties under this Section 8 are in addition to other rights and remedies (including, without limitation, other rights of set-off) which any Secured Party may have.

Section 9. Amendments, Etc. None of the terms or provisions of this Guaranty may be waived, amended, supplemented or otherwise modified except in accordance with Section 9.9 of the Credit Agreement.

Section 10. Notices, Etc. All notices and other communications provided for hereunder shall be given and become effective as provided in Section 9.02 of the Credit Agreement and shall be sent (a) if to any Guarantor, to its address specified in Section 9.02 of the Credit Agreement, (b) if to the Administrative Agent, the Swingline Lender, the Issuing Bank or any Lender, at its address specified in or pursuant to the Credit Agreement, (c) if to a Swap Counterparty, at its address specified in the applicable Hedge Contract, and (d) if to any Banking Service Provider, at its address specified in the documents providing for such Banking Services.

Section 11. No Waiver; Remedies. No failure on the part of the Administrative Agent or any other Secured Party to exercise, and no delay in exercising, any right hereunder shall operate as a waiver thereof; nor shall any single or partial exercise of any right hereunder preclude any other or further exercise thereof or the exercise of any other right. The remedies herein provided are cumulative and not exclusive of any remedies provided by law.

Section 12. Continuing Guaranty; Assignments under the Credit Agreement. This Guaranty is a continuing guaranty and shall:

(c) inure to the benefit of and be enforceable by the Administrative Agent, each Lender, the Swingline Lender, the Issuing Bank, and their respective successors, transferees, replacements and assigns; and

(d) inure to the benefit of the Swap Counterparties and the Banking Service Providers, and each of their respective successors, transferees, and assigns (but only to the extent such successor, transferee or assign of a Swap Counterparty or a Banking Service Provider also then qualifies as a Secured Party), provided that, notwithstanding anything contained in this Guaranty to the contrary, no Secured Party other than the Administrative Agent shall have any right individually to enforce this Guaranty, it being understood and agreed that all powers, rights and remedies hereunder may be exercised solely by the Administrative Agent on behalf of the

Without limiting the generality of the foregoing clause (c), subject to Section 9.06 of the Credit Agreement, any Lender may assign or otherwise transfer all or any portion of its rights and obligations under the Credit Agreement (including, without limitation, all or any portion of its Commitment, the Advances owing to it and the Note or Notes held by it) to any other Person, and such other Person shall thereupon become vested with all the benefits in respect thereof granted to such Lender herein or otherwise, subject, however, in all respects to the provisions of the Credit Agreement. Each Guarantor acknowledges that upon any Person becoming a Lender, the Administrative Agent, the Swingline Lender or the Issuing Bank in accordance with the Credit Agreement, such Person shall be entitled to the benefits hereof. Notwithstanding the foregoing, when (i) any Swap Counterparty assigns or otherwise transfers any interest held by it under any Hedge Contract between any Loan Party and/or any Subsidiary of a Loan Party and such Swap Counterparty to any other Person pursuant to the terms of such agreement or (ii) any Banking Service Provider transfers any Banking Services Obligations to any other Person, in each case, that other Person shall thereupon become vested with all the benefits held by such Secured Party under this Guaranty only if such Person also then qualifies as a Swap Counterparty or Banking Service Provider.

Section 15. Conflicts. In the event of any explicit or implicit conflict between any provision of this Guaranty and any provision of the Credit Agreement, the terms of the Credit Agreement shall be controlling.

Section 16. Severability. Wherever possible each provision of this Guaranty shall be interpreted in such manner as to be effective and valid under applicable law, but if any provision of this Guaranty shall be prohibited by or invalid under such law, such provision shall be ineffective to the extent of such prohibition or invalidity, without invalidating the remainder of such provision or the remaining provisions of this Guaranty.

Section 17. Counterparts. The parties may execute this Guaranty in counterparts, each of which constitutes an original, and all of which, collectively, constitute only one agreement. Delivery of an executed counterpart signature page by telecopy, facsimile or in electronic (i.e., “pdf” or “tif”) format is as effective as manually executing and delivering this Guaranty in the presence of the other parties to this Guaranty. In proving this Guaranty, a party must produce or account only for the executed counterpart of the party to be charged.

Section 18. Restatement of Existing Guaranty Agreement. The Existing Guaranty Agreement is hereby amended and restated in its entirety by this Guaranty Agreement (other than

that portion of the Existing Guaranty Agreement which is amended and restated in its entirety by the Amended and Restated Louisiana Guaranty Agreement), and all guaranties created and granted by the Existing Guaranty Agreement (other than that portion of the Existing Guaranty

Agreement which is amended and restated in its entirety by the Amended and Restated Louisiana Guaranty Agreement) are hereby automatically renewed and continued in full force and effect as security for the payment and performance of the Secured Obligations. Without limiting the effectiveness of any new guaranties under this Guaranty Agreement, nothing contained herein is intended to impair or extinguish the guaranties of the Existing Guaranty Agreement (other than that portion of the Existing Guaranty Agreement which is amended and restated in its entirety by the Amended and Restated Louisiana Guaranty Agreement), as hereby amended and restated, and such guaranties will remain in full force and effect to secure the payment and performance of the Secured Obligations. The parties hereto expressly recognize and confirm their intent to continue the effectiveness and priority of the guaranties granted under the Existing Guaranty Agreement, as hereby amend and restated, as security for the payment and performance of all Secured Obligations, whether now or hereafter owing.