Wyo. Stat. § 41-9-248: Omissions; agreement between landowner and commissioners.

In case of omission to assess any corporation or land that should be assessed for benefits, or construction, or repair, or additional assessment, or to award damages, said omitted party and the owner of omitted land may in writing agree with the commissioners of said district what the assessment should be against said land, or against said corporation, or what said damages should be and such agreement shall be acknowledged and witnessed as provided above for waivers, and be filed in the court.