Certain rights of municipal corporations not affected by ORS 312.010 to 312.120 and 312.130 to 312.240. No provision of ORS 312.010 to 312.120 and 312.130 to 312.240 shall impair or annul a right conferred upon municipal corporations by ORS 311.520 or 312.270 to 312.300

ORS 312.250 — under Chapter 312.