<PAGE>
 
                                                                      EXHIBIT 24

                               POWER OF ATTORNEY

KNOW ALL MEN, by these presents, that I, Patrick M. Byrne, hereby make,
constitute and appoint Gordon S. Macklin and Michael E.B. Spicer, each to be my
true and lawful attorney-in-fact, for and in my name, place and stead, to
execute and deliver the 1997 Annual Report on Form 10-K/A of White River
Corporation, and any and all amendments thereto; such Form 10-K/A and each such
amendment to be in such form and to contain such terms and provisions as said
attorney shall deem necessary or desirable; giving and granting unto said
attorney, full power and authority to do and perform any and every act and thing
whatsoever requisite, necessary or, in the opinion of said attorney, able to be
done in and about the premises as fully and to all intents and purposes as I
might or could do if personally present, hereby ratifying and confirming all
that said attorney shall lawfully do or cause to be done by virtue hereof.

IN WITNESS WHEREOF, I have duly executed these presents this 26th day of May,
1998.



                                                  /s/ Patrick M. Byrne
                                                  ---------------------
                                                  Patrick M. Byrne
_______________________
To: Fern/Mary
From: M. Spicer




<PAGE>
 
                                                                      EXHIBIT 24


                               POWER OF ATTORNEY

KNOW ALL MEN, by these presents, that I, Andrew Delaney, hereby make, constitute
and appoint Gordon S. Macklin and Michael E.B. Spicer, each to be my true and
lawful attorney-in-fact, for and in my name, place and stead, to execute and
deliver the 1997 Annual Report on Form 10-K/A of White River Corporation, and
any and all amendments thereto; such Form 10-K/A and each such amendment to be
in such form and to contain such terms and provisions as said attorney shall
deem necessary or desirable; giving and granting unto said attorney, full power
and authority to do and perform any and every act and thing whatsoever
requisite, necessary or, in the opinion of said attorney, able to be done in and
about the premises as fully and to all intents and purposes as I might or could
do if personally present, hereby ratifying and confirming all that said attorney
shall lawfully do or cause to be done by virtue hereof.

IN WITNESS WHEREOF, I have duly executed these presents this 26th day of May,
1998.


                                               /s/ Andrew Delaney
                                               -------------------
                                               Andrew Delaney
<PAGE>
 
                                                                      EXHIBIT 24

                               POWER OF ATTORNEY

KNOW ALL MEN, by these presents, that I, Gordon S. Macklin, hereby make,
constitute and appoint Michael E.B. Spicer, to be my true and lawful 
attorney-in-fact, for and in my name, place and stead, to execute and deliver
the 1997 Annual Report on Form 10-K/A of White River Corporation, and any and
all amendments thereto; such Form 10-K/A and each such amendment to be in such
form and to contain such terms and provisions as said attorney shall deem
necessary or desirable; giving and granting unto said attorney, full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary or, in the opinion of said attorney, able to be done in and about the
premises as fully and to all intents and purposes as I might or could do if
personally present, hereby ratifying and confirming all that said attorney shall
lawfully do or cause to be done by virtue hereof.

IN WITNESS WHEREOF, I have duly executed these presents this 26th day of May,
1998.


                                             /s/ Gordon S. Macklin
                                             ---------------------
                                             Gordon S. Macklin
<PAGE>
 
                                                                      EXHIBIT 24

                               POWER OF ATTORNEY

KNOW ALL MEN, by these presents, that I, Robert T. Marto, hereby make,
constitute and appoint Gordon S. Macklin and Michael E.B. Spicer, each to be my
true and lawful attorney-in-fact, for and in my name, place and stead, to
execute and deliver the 1997 Annual Report on Form 10-K/A of White River
Corporation, and any and all amendments thereto; such Form 10-K/A and each such
amendment to be in such form and to contain such terms and provisions as said
attorney shall deem necessary or desirable; giving and granting unto said
attorney, full power and authority to do and perform any and every act and thing
whatsoever requisite, necessary or, in the opinion of said attorney, able to be
done in and about the premises as fully and to all intents and purposes as I
might or could do if personally present, hereby ratifying and confirming all
that said attorney shall lawfully do or cause to be done by virtue hereof.

IN WITNESS WHEREOF, I have duly executed these presents this 26th day of May,
1998.



                                               /s/ Robert T. Marto
                                               -------------------------
                                               Robert T. Marto
<PAGE>
 
                                  EXHIBIT 24

                               POWER OF ATTORNEY

KNOW ALL MEN, by these presents, that I, Bonnie B. Stewart, hereby make,
constitute and appoint Gordon S. Macklin and Michael E.B. Spicer, each to be my
true and lawful attorney-in-fact, for and in my name, place and stead, to
execute and deliver the 1997 Annual Report on Form 10-K/A of White River
Corporation, and any and all amendments thereto; such Form 10-K/A and each such
amendment to be in such form and to contain such terms and provisions as said
attorney shall deem necessary or desirable; giving and granting unto said
attorney, full power and authority to do and perform any and every act and thing
whatsoever requisite, necessary or, in the opinion of said attorney, able to be
done in and about the premises as fully and to all intents and purposes as I
might or could do if personally present, hereby ratifying and confirming all
that said attorney shall lawfully do or cause to be done by virtue hereof.

IN WITNESS WHEREOF, I have duly executed these presents this 26th day of May,
1998.


                                                /s/ Bonnie B. Stewart
                                                -------------------------
                                                Bonnie B. Stewart