ORS § 537.690
The evidence relied upon by the Water Resources Director in the entry of the findings of fact and order of determination under ORS 537.685, together with a copy of such findings and order, shall be certified to by the director and filed with the clerk of the circuit court wherein the determination is to be heard, which shall be the circuit court of any county in which the ground water reservoir or any part thereof is located. A certified copy of the findings of fact and the order of determination shall also be filed with the county clerk of every other county in which the ground water reservoir or any part thereof is located. Thereafter, proceedings shall be had as nearly as possible in the same manner as provided in ORS 539.130(2), (3) and (4), 539.150, 539.160, 539.170, 539.180, 539.190 and 539.210 for the final adjudication of the relative rights of the various claimants to the waters of any surface stream.
ORS 537.690