C.R.S. § 37-41-148: Division of districts.

At least thirty days before the next general election of such district the board of directors thereof may make an order dividing said district into three divisions, as nearly equal in size as practicable, which divisions shall be numbered first, second, and third, and one director shall be elected for each division by the qualified electors of the whole district. For the purpose of election in such district, the said board of directors must establish a convenient number of election precincts and define the boundaries thereof, which said precincts may be changed from time to time, as the board of directors may deem necessary.