C.R.S. § 37-4-114: Lands exempt and later liable to assessment.

If any lands in any district organized under articles 1 to 8 of this title are not liable to assessment at the time of the execution of the work, but afterwards, during the period when such work is being paid for, become liable to assessment, such lands shall thereupon be appraised and assessed as other lands in said district receiving equal benefits.