<PAGE>

                                                                      EXHIBIT 24


                               POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints Stephen G. Hanks and Anthony S. Cleberg, and each of them, his true and
lawful attorneys-in-fact and agents, with full power of substitution and
resubstitution, for him and in his name, place and stead, in any and all
capacities, to sign on his behalf as a director or officer or both, as the case
may be, of Morrison Knudsen Corporation, a Delaware corporation, Form 10-K
Annual Report for fiscal year ended December 3, 1999, and any and all amendments
thereto, and to file the same, with all exhibits thereto, and other documents in
connection therewith, with the Securities and Exchange Commission, granting unto
said attorneys-in-fact and agents, and each of them, full power and authority to
do and perform each and every act and thing requisite and necessary to be done
in and about the premises, as fully to all intents and purposes as each of them
might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, or any of them, or their substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Exchange Act of 1934, this
Power of Attorney has been signed below on the 15th day of February, 2000.


                              /s/
                              ------------------------------------------
                              Dennis R. Washington, Chairman
<PAGE>

                               POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints Dennis R. Washington, Stephen G. Hanks and Anthony S. Cleberg, and each
of them, his true and lawful attorneys-in-fact and agents, with full power of
substitution and resubstitution, for him and in his name, place and stead, in
any and all capacities, to sign on his behalf as a director or officer or both,
as the case may be, of Morrison Knudsen Corporation, a Delaware corporation,
Form 10-K Annual Report for fiscal year ended December 3, 1999, and any and all
amendments thereto, and to file the same, with all exhibits thereto, and other
documents in connection therewith, with the Securities and Exchange Commission,
granting unto said attorneys-in-fact and agents, and each of them, full power
and authority to do and perform each and every act and thing requisite and
necessary to be done in and about the premises, as fully to all intents and
purposes as each of them might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or any of them, or their
substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Exchange Act of 1934, this
Power of Attorney has been signed below on the 15th day of February, 2000.


                              /s/
                              ------------------------------------------
                              David H. Batchelder
<PAGE>

                               POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints Dennis R. Washington, Stephen G. Hanks and Anthony S. Cleberg, and each
of them, his true and lawful attorneys-in-fact and agents, with full power of
substitution and resubstitution, for him and in his name, place and stead, in
any and all capacities, to sign on his behalf as a director or officer or both,
as the case may be, of Morrison Knudsen Corporation, a Delaware corporation,
Form 10-K Annual Report for fiscal year ended December 3, 1999, and any and all
amendments thereto, and to file the same, with all exhibits thereto, and other
documents in connection therewith, with the Securities and Exchange Commission,
granting unto said attorneys-in-fact and agents, and each of them, full power
and authority to do and perform each and every act and thing requisite and
necessary to be done in and about the premises, as fully to all intents and
purposes as each of them might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or any of them, or their
substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Exchange Act of 1934, this
Power of Attorney has been signed below on the 15th day of February, 2000.


                              /s/
                              --------------------------------------
                              Leonard R. Judd
<PAGE>

                               POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints Dennis R. Washington, Stephen G. Hanks and Anthony S. Cleberg, and each
of them, his true and lawful attorneys-in-fact and agents, with full power of
substitution and resubstitution, for him and in his name, place and stead, in
any and all capacities, to sign on his behalf as a director or officer or both,
as the case may be, of Morrison Knudsen Corporation, a Delaware corporation,
Form 10-K Annual Report for fiscal year ended December 3, 1999, and any and all
amendments thereto, and to file the same, with all exhibits thereto, and other
documents in connection therewith, with the Securities and Exchange Commission,
granting unto said attorneys-in-fact and agents, and each of them, full power
and authority to do and perform each and every act and thing requisite and
necessary to be done in and about the premises, as fully to all intents and
purposes as each of them might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or any of them, or their
substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Exchange Act of 1934, this
Power of Attorney has been signed below on the 15th day of February, 2000.


                              /s/
                              --------------------------------------
                              Robert S. Miller, Jr.
<PAGE>

                               POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints Dennis R. Washington, Stephen G. Hanks and Anthony S. Cleberg, and each
of them, his true and lawful attorneys-in-fact and agents, with full power of
substitution and resubstitution, for him and in his name, place and stead, in
any and all capacities, to sign on his behalf as a director or officer or both,
as the case may be, of Morrison Knudsen Corporation, a Delaware corporation,
Form 10-K Annual Report for fiscal year ended December 3, 1999, and any and all
amendments thereto, and to file the same, with all exhibits thereto, and other
documents in connection therewith, with the Securities and Exchange Commission,
granting unto said attorneys-in-fact and agents, and each of them, full power
and authority to do and perform each and every act and thing requisite and
necessary to be done in and about the premises, as fully to all intents and
purposes as each of them might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or any of them, or their
substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Exchange Act of 1934, this
Power of Attorney has been signed below on the 15th day of February, 2000.


                              /s/
                              --------------------------------------
                              Dorn Parkinson
<PAGE>

                               POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints Dennis R. Washington, Stephen G. Hanks and Anthony S. Cleberg, and each
of them, his true and lawful attorneys-in-fact and agents, with full power of
substitution and resubstitution, for him and in his name, place and stead, in
any and all capacities, to sign on his behalf as a director or officer or both,
as the case may be, of Morrison Knudsen Corporation, a Delaware corporation,
Form 10-K Annual Report for fiscal year ended December 3, 1999, and any and all
amendments thereto, and to file the same, with all exhibits thereto, and other
documents in connection therewith, with the Securities and Exchange Commission,
granting unto said attorneys-in-fact and agents, and each of them, full power
and authority to do and perform each and every act and thing requisite and
necessary to be done in and about the premises, as fully to all intents and
purposes as each of them might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or any of them, or their
substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Exchange Act of 1934, this
Power of Attorney has been signed below on the 15th day of February, 2000.


                              /s/
                              --------------------------------------
                              Terry W. Payne
<PAGE>

                               POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints Dennis R. Washington, Stephen G. Hanks and Anthony S. Cleberg, and each
of them, his true and lawful attorneys-in-fact and agents, with full power of
substitution and resubstitution, for him and in his name, place and stead, in
any and all capacities, to sign on his behalf as a director or officer or both,
as the case may be, of Morrison Knudsen Corporation, a Delaware corporation,
Form 10-K Annual Report for fiscal year ended December 3, 1999, and any and all
amendments thereto, and to file the same, with all exhibits thereto, and other
documents in connection therewith, with the Securities and Exchange Commission,
granting unto said attorneys-in-fact and agents, and each of them, full power
and authority to do and perform each and every act and thing requisite and
necessary to be done in and about the premises, as fully to all intents and
purposes as each of them might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or any of them, or their
substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Exchange Act of 1934, this
Power of Attorney has been signed below on the 15th day of February, 2000.


                              /s/
                              --------------------------------------
                              John D. Roach
<PAGE>

                               POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints Dennis R. Washington, Stephen G. Hanks and Anthony S. Cleberg, and each
of them, his true and lawful attorneys-in-fact and agents, with full power of
substitution and resubstitution, for him and in his name, place and stead, in
any and all capacities, to sign on his behalf as a director or officer or both,
as the case may be, of Morrison Knudsen Corporation, a Delaware corporation,
Form 10-K Annual Report for fiscal year ended December 3, 1999, and any and all
amendments thereto, and to file the same, with all exhibits thereto, and other
documents in connection therewith, with the Securities and Exchange Commission,
granting unto said attorneys-in-fact and agents, and each of them, full power
and authority to do and perform each and every act and thing requisite and
necessary to be done in and about the premises, as fully to all intents and
purposes as each of them might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or any of them, or their
substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Exchange Act of 1934, this
Power of Attorney has been signed below on the 15th day of February, 2000.


                              /s/
                              --------------------------------------
                              Thomas H. Zarges