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Lane County adopts emergency erosion-prevention rules to meet Willamette Basin Mercury TMDL
Summary
Lane County commissioners adopted Ordinance 2506 and Order 25081207 on Aug. 26, 2025, enacting outcome-based erosion-prevention requirements in the county—s portion of the Willamette River Basin to meet Oregon DEQ—s Mercury Total Maximum Daily Load deadline; fees will follow.
Lane County commissioners on Aug. 26 adopted an emergency ordinance and a companion Lane Manual order to extend erosion-prevention requirements across the county—s portion of the Willamette River Basin to comply with the Willamette Basin Mercury Total Maximum Daily Load (Mercury TMDL). The board voted 5-0 on a roll-call to pass Ordinance 2506 and then unanimously approved Order 25081207.
The ordinance adds TMDL-specific language to Lane Code chapters 9, 11 and 15 and amends the Lane Manual chapter 9 to align county practice with the Mercury TMDL administered by the Oregon Department of Environmental Quality (DEQ). Staff described the action as a minimal, outcomes-based approach that extends existing erosion-prevention outcomes already applied inside municipal separate storm sewer system (MS4) areas to the larger TMDL area, which covers about 76% of Lane County.
The change comes because DEQ—s Mercury TMDL sets a Sept. 3, 2025, implementation deadline for counties to adopt water-quality management requirements. Staff requested emergency enactment so the ordinance and order would be effective…
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