POWER OF ATTORNEY

The undersigned hereby constitutes and appoints
James J. Hinnendael and Kathy A. Degenhardt and
each of them signing singly, and with full power
of substitution, to be the undersigned's true and
lawful attorney-in-fact to:

(1)	execute for and on behalf of the undersigned,
in the undersigned's capacity as an officer and/or
director of Marten Transport, Ltd. (the Company),
Forms 3, 4 and 5 in accordance with Section 16(a)
of the Securities Exchange Act of 1934, as amended,
and the rules promulgated thereunder from time to
time (collectively, the Act);

(2) 	do and perform any and all acts for and on
behalf of the undersigned which may be necessary
or desirable to complete and execute any such
Form 3, 4, or 5, complete and execute any amendment
or amendments thereto, and timely file such forms
with the United States Securities and Exchange
Commission and any stock exchange or
similar authority; and

(3) 	take any other action of any type whatsoever
in connection with the foregoing which, in the opinion
of such attorney-in-fact, may be of benefit to, in the
best interest of, or legally required by, the
undersigned, it being understood that the documents
executed by such 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 such attorney-in-fact may approve in
such attorney-in-fact's discretion.

The undersigned hereby grants to each such attorney-
in-fact full power and authority to do and perform
any 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 such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, 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, in serving in such capacity at the
request of the undersigned, are not assuming, nor is
the Company assuming, any of the undersigned's
responsibilities to comply with the Act.

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 with respect to the undersigned's
holdings of and transactions in securities issued by the
Company, unless earlier revoked by the undersigned in
a signed writing delivered to the foregoing attorneys-
in-fact.

IN WITNESS WHEREOF, the undersigned has caused this
Power of Attorney to be executed effective as of the
3rd day of March, 2020.

/s/ Kathleen P. Iverson
Kathleen P. Iverson