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The main campus of the University of Oregon in Eugene spans approximately 295 acres in the Willamette River watershed. Of those 295 acres, building rooftops make up roughly 75 acres, other impervious surfaces 94 acres, and pervious surfaces the remaining 126 acres.


The University of Oregon has over 20 building sites with city-registered, vegetated stormwater treatment facilities. These facilities filter debris, and pollutants and slow the flow of stormwater, which protects habitats. Many creatures, from salmon to herons to UO students, use the river. Our vegetated, stormwater treatment facilities are part of our commitment to be a good neighbor to the river flowing next door.

The number of facilities and total area treated are increasing each year as new buildings trigger additional mandatory stormwater treatment. The number of individual stormwater treatment facilities on a building site varies, based on design decisions made during the planning phase of each site.

In addition to stormwater treatment facilities registered with the city, the university has several other facilities that treat stormwater but may or may not meet city standards. These facilities were designed and installed out of a desire to improve stormwater treatment on campus, but are not held to the same inspection and maintenance standards as those registered with the city. Both the city and the university prioritize vegetated stormwater treatment facilities over mechanical treatment. However, where building sites are constrained for space the university uses mechanical treatment. The university has eight mechanical stormwater treatment facilities.