Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Stonepeak Catarina Holdings LLC
   2. Issuer Name and Ticker or Trading Symbol
Sanchez Midstream Partners LP [SNMP] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
See Remarks
(Last)
(First)
(Middle)
717 FIFTH AVENUE, 25TH FLOOR		 3. Date of Earliest Transaction (Month/Day/Year)
08/21/2018
(Street)

NEW YORK, NY 10022		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Class B Preferred Units (2) 08/21/2018   A(1)   310,009 (1)     (2)   (2) Common Units 310,009 (1) 31,310,896 D (3) (4)  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Stonepeak Catarina Holdings LLC
717 FIFTH AVENUE, 25TH FLOOR
NEW YORK, NY 10022		       See Remarks
Stonepeak Catarina Upper Holdings LLC
717 FIFTH AVENUE, 25TH FLOOR
NEW YORK, NY 10022		       See Remarks
Stonepeak Infrastructure Fund (Orion AIV) LP
717 FIFTH AVENUE, 25TH FLOOR
NEW YORK, NY 10022		       See Remarks
Stonepeak Associates LLC
717 FIFTH AVENUE, 25TH FLOOR
NEW YORK, NY 10022		       See Remarks
Stonepeak GP Holdings LP
717 FIFTH AVENUE, 25TH FLOOR
NEW YORK, NY 10022		       See Remarks
Stonepeak GP Investors LLC
717 FIFTH AVENUE, 25TH FLOOR
NEW YORK, NY 10022		       See Remarks
Stonepeak GP Investors Manager LLC
717 FIFTH AVENUE, 25TH FLOOR
NEW YORK, NY 10022		       See Remarks
Dorrell Michael B.
717 FIFTH AVENUE, 25TH FLOOR
NEW YORK, NY 10022		       See Remarks
Vichie Trent D
717 FIFTH AVENUE, 25TH FLOOR
NEW YORK, NY 10022		       See Remarks

Signatures

 /s/ Michael Dorrell   02/04/2019
**Signature of Reporting Person Date
 /s/ Trent Vichie   02/04/2019
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) These Class B Preferred Units (the "Preferred Units") were payable by the Issuer on August 31, 2018, to Preferred Unit holders of record on August 21, 2018, in satisfaction of the non-cash component of the second quarter 2018 distribution on the Preferred Units.
(2) The Preferred Units are convertible into Common Units at any time, at the holder's election, subject to the requirement to convert a minimum of $17.5 million of Preferred Units. The Preferred Units have no expiration date. Each Preferred Unit is currently convertible into one Common Unit.
(3) These Preferred Units are owned directly by Stonepeak Catarina Holdings LLC, and indirectly by Stonepeak Catarina Upper Holdings LLC, Stonepeak Infrastructure Fund (Orion AIV) LP, Stonepeak Associates LLC, Stonepeak GP Holdings LP, Stonepeak GP Investors LLC, Stonepeak GP Investors Manager LLC, Michael Dorrell and Trent Vichie. Stonepeak Catarina Upper Holdings LLC is the managing member of Stonepeak Catarina Holdings LLC. Stonepeak Infrastructure Fund (Orion AIV) LP is the managing member of Stonepeak Catarina Upper Holdings LLC. Stonepeak Associates LLC is the general partner of Stonepeak Infrastructure Fund (Orion AIV) LP. Stonepeak GP Holdings LP is the sole member of Stonepeak Associates LLC. Stonepeak GP Investors LLC is the general partner of Stonepeak GP Holdings LP. Stonepeak GP Investors Manager LLC is the managing member of Stonepeak GP Investors LLC. Each of Michael Dorrell and Trent Vichie serve as a managing member of Stonepeak GP Investors Manager LLC.
(4) Each Reporting Person disclaims beneficial ownership of the Preferred Units except to the extent of his or its pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the Preferred Units for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or for any other purpose.
 
Remarks:
Exhibit 99.1: Additional Signatures.

Solely for purposes of Section 16 of the Exchange Act, each of the Reporting Persons may be deemed to be directors-by-deputization by virtue of Stonepeak Catarina Holdings LLC's contractual right to, based on its current ownership, designate two persons to serve on the board of directors of the General Partner of the Issuer (the "Board").  Jack Howell and Luke Taylor, each an employee of Stonepeak Catarina Holdings LLC, are members of the Board.

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