Wyo. Stat. § 41-9-243
It shall be the duty of the commissioners of each drainage district, on or before the first Monday of August of each year to prepare an assessment roll of said district, which shall contain the name of the owner, if known, together with a description of each lot, tract and easement of land within said district, and the aggregate assessments of benefits confirmed by the court against the same; and the name of all corporations assessed, together with the aggregate assessment levied against such corporations respectively. The assessment roll shall also show the amount assessed against each lot, tract and easement of land, and against each corporation in the district, for current expense and to meet the principal and interest on the indebtedness of the district for the current year. All such assessments shall be apportioned on the aggregate assessment of benefits last confirmed by the court. When such assessment roll is completed it shall be signed by the commissioners of said district and verified by any one of them. On or before the first Monday in August, of each year the commissioners of the drainage district shall deliver to the county commissioners of the county having jurisdiction of such drainage district the assessment roll of such district. The county commissioners of said county immediately upon the receipt of the assessment roll of such district and at the time of making the requisite tax levy for county purposes, shall levy and assess against each lot, tract and easement of land and against each corporation, the respective amounts levied and assessed against the same on said assessment roll. Thereupon the county commissioners shall certify to and deliver said assessment roll to the county assessor of such county, and in case the territory embraced in such district is located in two (2) or more counties a copy of the assessment roll as certified to by the county commissioners of the county having jurisdiction of such district shall be delivered to the assessor of each county in which any of the land of the district is located. Upon receipt of such assessment roll the assessors of the counties embracing any of the lands of such district shall extend upon the tax roll of such county the respective amounts levied and assessed against each lot, tract and easement of land, and against each corporation as shown by said assessment roll of said district.
W.S. 41-9-243