Exhibit 24 POWER OF ATTORNEY The undersigned Directors of Valmont Industries, Inc., a Delaware corporation, hereby constitute and appoint Mogens C. Bay as attorney-in-fact in their name, place and stead to execute Valmont's Annual Report on Form 10-K for the fiscal year ended December 26, 1998, together with any and all subsequent amendments thereof in their capacity as Chairman of the Board and hereby ratify all that said attorney-in-fact may do by virtue thereof. DATED this 24th day of February, 1999. /s/ Robert B. Daugherty /s/ John E. Jones - ------------------------------- ----------------------------- Robert B. Daugherty, Director John E. Jones, Director /s/ Charles M. Harper /s/ Thomas F. Madison - ------------------------------- ----------------------------- Charles M. Harper, Director Thomas F. Madison, Director /s/ Allen F. Jacobson /s/ Walter Scott, Jr. - ------------------------------- ----------------------------- Allen F. Jacobson, Director Walter Scott, Jr., Director /s/ Lloyd P. Johnson /s/ Kenneth E. Stinson - ------------------------------- ----------------------------- Lloyd P. Johnson, Director Kenneth E. Stinson, Director /s/ Robert G. Wallace /s/ Charles D. Peebler, Jr. - ------------------------------- ----------------------------- Robert G. Wallace, Director Charles D. Peebler, Jr. /s/ Bruce Rhode - ------------------------------- Bruce Rhode 203