Oregon Revised Statutes Public Health and Safety § 457.220

(a) The aggregate of all amendments under this subsection may not exceed 20 percent of the plan's initial maximum indebtedness, as adjusted pursuant to paragraph (b) of this subsection.

(b) For purposes of computing the 20 percent limit on increases in maximum indebtedness, the initial maximum indebtedness may be increased annually on the anniversary date of initial approval of the plan by the index used in the urban renewal report to compute the future costs of projects that will be financed under the plan, beginning on the later of July 1, 1999, or the first anniversary of plan approval. This increase may be applied only to the first amendment to the maximum indebtedness that is made on or after January 1, 2010.