POWER OF ATTORNEY
For Executing Forms 3, 4 and 5, Form 144 and Schedules 13D and 13G
relating to Summit Midstream Partners, LP ("SMLP")

The undersigned hereby constitutes and appoints each of J. Heath Deneke, Marc D.
Stratton, and Megan C. Davis, signing singly, as the undersigned's true and
lawful attorney in fact to:

(1)	execute for and on behalf of the undersigned (a) Forms 3, 4 and 5 (including
amendments thereto) in accordance with Section 16(a) of the Securities Exchange
Act of 1934, as amended (the "Act") and the rules thereunder, (b) Form 144 and
(c) Schedules 13D and 13G (including amendments thereto) in accordance with
Sections 13(d) and 13(g) of the Act and the rules thereunder;

(2)	do and perform any and all acts for and on behalf of the undersigned that
may be necessary or desirable to complete and execute any such Form 3, 4 or 5,
Form 144 or Schedule 13D or 13G (including amendments thereto) and timely file
such Forms or Schedules with the Securities and Exchange Commission ("SEC") and
any stock exchange, self-regulatory association or any other authority;

(3)	take any necessary or appropriate action to obtain or regenerate codes and
passwords enabling the undersigned to make electronic filings with the SEC of
reports required by Section 16(a) of the Act or any rule or regulation of the
SEC; and

(4)	take any other action of any type whatsoever in connection with the
foregoing that, in the opinion of each such attorney-in-fact, may be of benefit
to, in the best interest of, or legally required of the undersigned, it being
understood that the documents executed by the attorney in fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as the attorney-in-fact may approve in the
attorney-in-fact's discretion.

The undersigned hereby grants to each attorney-in-fact full power and authority
to do and perform each and every act and thing whatsoever requisite, necessary
or proper to be done in the exercise of any of the rights and powers herein
granted, as fully to all intents and purposes as the undersigned might or could
do if personally present, with full power of substitution or revocation, hereby
ratifying and confirming all that the attorneys-in-fact substitute, shall
lawfully do or cause to be done by virtue of this Power of Attorney and the
rights and powers herein granted. The undersigned acknowledges that the
foregoing attorneys-in-fact, and their substitutes, in serving in such capacity
at the request of the undersigned, are not assuming (nor is SMLP assuming) any
of the undersigned's responsibilities to comply with Section 16 of the Act.

The undersigned agrees that each such attorney-in-fact may rely entirely on
information furnished orally or in writing by the undersigned to the
attorney-in-fact. The undersigned also agrees to indemnify and hold harmless
SMLP and each such attorney in fact against any losses, claims, damages or
liabilities (or actions in these respects) that arise out of or are based upon
any untrue statements or omissions of necessary facts in the information
provided by the undersigned to such attorney-in-fact for purposes of executing,
acknowledging, delivering or filing Form 3, 4 or 5, Form 144 or Schedule 13D or
13G (including amendments thereto) and agrees to reimburse SMLP and the attorney
in fact on demand for any legal or other expenses reasonably incurred in
connection with investigating or defending against any such loss, claim, damage,
liability or action.

This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 and 5, Form 144 and
Schedules 13D and 13G (including amendments thereto) with respect to the
undersigned's holdings of and transactions in securities issued by SMLP unless
earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact. This Power of Attorney does not revoke any other
power of attorney that the undersigned has previously granted.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of the date written below.



/s/ James David Johnston
James David Johnston

Date:  August 31, 2020