<Page>

                                                                      EXHIBIT 24


                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes
and appoints Craig G. Taylor his true and lawful attorney-in-fact and agent,
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 Washington Group International, Inc.,
a Delaware corporation, Form 10-K Annual Report for fiscal year ended December
1, 2000, 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 attorney-in-fact and
agent, 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 attorney-in-fact and agent, or his
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 10th day of May, 2002.


                               /s/ David H. Batchelder

                               -----------------------------------------
                               David H. Batchelder
<Page>

                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes
and appoints Craig G. Taylor his true and lawful attorney-in-fact and agent,
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 Washington Group International, Inc.,
a Delaware corporation, Form 10-K Annual Report for fiscal year ended December
1, 2000, 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 attorney-in-fact and
agent, 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 attorney-in-fact and agent, or his
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 10th day of May, 2002.


                               /s/ Michael R. D'Appolonia

                               -----------------------------------------
                               Michael R. D'Appolonia
<Page>

                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes
and appoints Craig G. Taylor his true and lawful attorney-in-fact and agent,
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 Washington Group International, Inc.,
a Delaware corporation, Form 10-K Annual Report for fiscal year ended December
1, 2000, 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 attorney-in-fact and
agent, 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 attorney-in-fact and agent, or his
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 10th day of May, 2002.

                               /s/ William J. Flanagan

                               -----------------------------------------
                               William J. Flanagan
<Page>

                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes
and appoints Craig G. Taylor his true and lawful attorney-in-fact and agent,
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 Washington Group International, Inc.,
a Delaware corporation, Form 10-K Annual Report for fiscal year ended December
1, 2000, 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 attorney-in-fact and
agent, 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 attorney-in-fact and agent, or his
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 10th day of May, 2002.


                               /s/ C. Scott Greer

                               -----------------------------------------
                               C. Scott Greer
<Page>

                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes
and appoints Craig G. Taylor his true and lawful attorney-in-fact and agent,
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 Washington Group International, Inc.,
a Delaware corporation, Form 10-K Annual Report for fiscal year ended December
1, 2000, 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 attorney-in-fact and
agent, 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 attorney-in-fact and agent, or his
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 10th day of May, 2002.


                               /s/ William H. Mallender

                               -----------------------------------------
                               William H. Mallender
<Page>

                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes
and appoints Craig G. Taylor his true and lawful attorney-in-fact and agent,
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 Washington Group International, Inc.,
a Delaware corporation, Form 10-K Annual Report for fiscal year ended December
1, 2000, 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 attorney-in-fact and
agent, 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 attorney-in-fact and agent, or his
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 10th day of May, 2002.

                               /s/ Michael P. Monaco

                               -----------------------------------------
                               Michael P. Monaco
<Page>

                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes
and appoints Craig G. Taylor his true and lawful attorney-in-fact and agent,
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 Washington Group International, Inc.,
a Delaware corporation, Form 10-K Annual Report for fiscal year ended December
1, 2000, 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 attorney-in-fact and
agent, 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 attorney-in-fact and agent, or his
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 10th day of May, 2002.

                                /s/ Cordell Reed

                               -----------------------------------------
                               Cordell Reed
<Page>

                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes
and appoints Craig G. Taylor his true and lawful attorney-in-fact and agent,
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 Washington Group International, Inc.,
a Delaware corporation, Form 10-K Annual Report for fiscal year ended December
1, 2000, 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 attorney-in-fact and
agent, 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 attorney-in-fact and agent, or his
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 10th day of May, 2002.


                               /s/ Dennis R. Washington

                               -----------------------------------------
                               Dennis R. Washington
<Page>

                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes
and appoints Craig G. Taylor her true and lawful attorney-in-fact and agent,
with full power of substitution and resubstitution, for her and in her name,
place and stead, in any and all capacities, to sign on her behalf as a director
or officer or both, as the case may be, of Washington Group International, Inc.,
a Delaware corporation, Form 10-K Annual Report for fiscal year ended December
1, 2000, 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 attorney-in-fact and
agent, 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 attorney-in-fact and agent, or his
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 10th day of May, 2002.


                               /s/ Bettina M. Whyte

                               -----------------------------------------
                               Bettina M. Whyte
<Page>

                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes
and appoints Craig G. Taylor his true and lawful attorney-in-fact and agent,
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 Washington Group International, Inc.,
a Delaware corporation, Form 10-K Annual Report for fiscal year ended December
1, 2000, 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 attorney-in-fact and
agent, 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 attorney-in-fact and agent, or his
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 10th day of May, 2002.


                               /s/ Dennis K. Williams

                               -----------------------------------------
                               Dennis K. Williams