ORS 92.150: Construction of donations marked on plat.

Every donation or grant to the public, including streets and alleys, or to any individual, religious society, corporation or body politic, marked or noted as such on the subdivision or partition plat wherein the donation or grant was made, shall be considered a general warranty to the donee or grantee for the use of the donee or grantee for the purposes intended by the donor or grantor.