The City of Oregon City (City) developed this citywide Stormwater Master Plan (Master Plan) to guide stormwater-related priorities and capital improvement projects (CIP) over the next 10 to 15 years. The City is currently managing more than 174 miles of stormwater infrastructure, including significant areas of aging systems. At the same time, development rates and projections indicate that the stormwater system will require continued expansion to accommodate future growth. The City's previous Drainage Master Plan was completed in 1988 and following nearly 30 years of development across Oregon City, was no longer relevant. The City maintains three basin plans, available under the Supporting Documents section, because they contain information still relevant to specific development areas.
The City needed a proactive plan to address immediate capacity needs, replace aging infrastructure, and provide regional solutions to larger flooding and water quality challenges. The updated CIP list and selected programmatic approaches included in this Master Plan will facilitate a prioritization of the City's resources and support future resource and financial planning.
This Master Plan is intended to be used in conjunction with both the City's National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) Permit, and Stormwater Grading and Design Standards, which outline the City's stormwater quality and quantity related obligations and programs.
The Oregon City Stormwater Master Plan was adopted by the City Commission through the execution of Ordinance 19-1014 and became effective April 17, 2020.