Additions to cities or towns by subdividing landowners; plat requirements; filing and effect thereof; controlling layout of streets.
Wyo. Stat. Ann. § 15-1-415
in effect(a) The owner of any land within or contiguous to any city or town may subdivide the land into lots, blocks, streets, avenues and alleys and other grounds under the name of .... addition to the city (town) of .... An accurate map or plat shall be made designating the subdivided land and particularly describing the lots, blocks, streets, avenues and alleys and other grounds of the addition. The lots must be designated by numbers, and the streets, avenues and other grounds by name or numbers.
(b) The plat shall:
(i) Be acknowledged before some officer authorized to acknowledge deeds;
(ii) Have appended a survey made by a land surveyor registered under the laws of this state with a certificate that he has accurately surveyed the addition, and that the parts thereof are accurately staked off and marked with an appropriate metal monument including magnetic iron, inscribed at least with the registration number of the land surveyor to provide source identification, at all lot corners and survey control points of the addition.
(c) When the map or plat is made out, acknowledged, certified and approved by the governing body, it shall be filed and recorded in the office of the county clerk. When filed it is equivalent to a deed in fee simple to the city or town from the owner, of all streets, avenues, alleys, public squares, parks and commons and of that portion of the land set apart for public and city use, or dedicated to charitable, religious or educational purposes. All additions thus laid out are a part of the city or town for all purposes, and the inhabitants of the addition are entitled to all the rights and privileges and subject to all the laws, ordinances, rules and regulations of the city or town.
(d) The governing body, by ordinance, may compel the owner of any addition to lay out streets, avenues and alleys to correspond in width and direction and be continuations of the streets, ways and alleys in the city or town or other additions thereto. No addition is valid unless the terms and conditions of the ordinance are complied with and the plat submitted and approved by the governing body.
(e) With respect to any water rights appurtenant to lands to be subdivided in accordance with this section and prior to certification and approval of the map or plat the governing body shall require the owner to submit to the governing body the following:
(i) The intended disposition of the water rights, by:
(A) Written documentation from the state engineer or the state board of control that the owner submitted to the state engineer or the state board of control all documents necessary to voluntarily abandon the water rights, cancel any unadjudicated permits or eliminate applicable lands from any unadjudicated permits. The owner shall notify any purchasers of this action;
(B) Written documentation from the state board of control that the owner submitted to the state board of control all documents necessary to change the use or place of use to provide for beneficial use of the water rights outside the subdivision, which may include a transfer to the city or town for use within its municipal water service boundaries;
(C) A plan, accompanied by written documentation from the state engineer approving the plan, for the distribution of the water rights appurtenant to the land to be subdivided. The plan shall specify the distribution of the water to the lots within the subdivision and shall include written documentation from the state board of control that the owner submitted to the state board of control all documents necessary to change the use, place of use or point of diversion or means of conveyance in accordance with W.S. 41-3-103, 41-3-104 or 41-3-114; or
(D) Written documentation from the state board of control that it has accepted an authorization to detach water rights appurtenant to the lands to be subdivided in accordance with rules and regulations promulgated by the state board of control.
(ii) If the subdivision is located within lands served by or crossed by a ditch, irrigation works or other water conveyance system, evidence that the owner submitted the subdivision map or plat to the public entity, company, association or appropriators responsible for the ditch, irrigations works or other water conveyance system for review and recommendations at least sixty (60) days prior to the submittal of the map or plat to the governing body. Upon receipt of the subdivision map or plat, the public entity, company, association or appropriators shall notify the owner if and how the subdivision will create a significant additional burden or risk of liability;
(iii) Evidence that the owner will specifically state on all offers and solicitations relative to the subdivision the owner's intent to comply with this paragraph and that the owner does not warrant to a purchaser that the purchaser shall have any rights to the natural flow of any stream within or adjacent to the proposed subdivision. The owner shall further state that Wyoming law does not recognize any riparian rights to the continued natural flow of a stream or river for persons living on the banks of the stream or river;
(iv) If the subdivision is located within the boundaries of an irrigation district that is subject to the provisions of title 41, chapter 7 of the Wyoming statutes, the map or plat shall be accompanied by recommendations from the irrigation district regarding any changes to the attached water rights and the irrigation district's easements. If there is a conflict with the irrigation district's recommendations, the owner shall certify that it met with and made a good faith effort to resolve any conflicts with the irrigation district; and
(v) If the subdivision will create a significant additional burden or risk of liability to the public entity, company, association or appropriators responsible for the ditch, irrigation works or other water conveyance system, the owner shall provide an adequate and responsible plan to reduce or eliminate the additional burden or risk of liability and evidence that the owner submitted the plan to the public entity, company, association or appropriators for review and recommendation regarding the adequacy of the plan.
Source: WY Statutes (Official Site)URL: https://wyoleg.gov/statutes/compress/title15.pdfFetched: 10/4/2026