C.R.S. § 32-11-668

Whenever any assessment for any project under this article, in the opinion of the board, is invalid by reason of any irregularity or informality in the proceedings, or if any court of competent jurisdiction adjudges such assessments to be illegal, the board, whether the project has been effected or not or whether any parts of the assessments have been paid or not, has power to cause a new assessment to be made for the same purpose for which the former assessment was made.