Oregon Revised Statutes Commercial Fishing and Fisheries § 509.140

(1) Whenever in the course of removing any obstruction in any waters of this state, or in constructing any foundations for dams, bridges or other structures, or in carrying on any trade or business, any person, municipal corporation, political subdivision or governmental agency desires to use explosives or any substances deleterious to fish, such person, municipal corporation, political subdivision or governmental agency shall make application to the State Fish and Wildlife Commission for a permit to use the explosives or substances in such waters.

(2) If the commission finds it necessary that the explosives or substances be used, it may make an order granting such person, municipal corporation, political subdivision or governmental agency the right to use the explosives or substances and shall:

(3) It is unlawful to disregard such order or fail to obtain such order or permit before using explosives or substances deleterious to fish.