The council may, whenever it deems it expedient, improve the public grounds within any city referred to in ORS § 221.906, and establish and open additional streets and alleys therein. The power and authority to improve streets includes the power and authority to construct, improve, pave, repair, and keep in repair, sidewalks and pavements, and to determine and provide everything convenient and necessary concerning such improvements and repairs. [Amended by 1969 c.429 § 5]