ORS § 554.410
Nothing in ORS 554.005 to 554.340 shall be so construed as to affect the validity of any district improvement company organized before March 4, 1937, under the provisions of chapter 172, Oregon Laws 1911, or its rights in or to property, or any of its rights or privileges of whatsoever kind or nature; but such corporations hereby are made subject to the provisions of ORS 554.005 to 554.340 so far as applicable. The provisions of ORS 554.005 to 554.340 shall not affect, impair or discharge any contract, obligation, lien or charge for or upon which such a company was or might become liable or chargeable had those sections not been passed; nor shall they affect the validity of any bonds issued prior to March 4, 1937; nor shall they affect any action then pending. All such corporations organized after March 4, 1937, shall be organized under the provisions of ORS 554.005 to 554.340 and not otherwise. Any corporation organized before March 4, 1937, under the provisions of chapter 172, Oregon Laws 1911, which amends its articles of incorporation and landowners' notice as provided in ORS 554.420, shall thereafter be subject to the provisions of ORS 554.005 to 554.340.
ORS 554.410