Sidestream Elevated Pool Aeration (SEPA)

The District's Sidestream Elevated Pool Aeration (SEPA) project received the Outstanding Civil Engineering Achievement Award in 1994. The award is the highest honor bestowed on a civil engineering project by the American Society of Civil Engineers. With the development of the SEPA stations, the District has replicated one of the most effective reclamation techniques – waterfalls – which add oxygen to water in the turbulent cascades. There are currently five major SEPA stations along the Calumet River and the Calumet-Sag Channel. In addition to enhancing the surrounding scenery and providing park-like environments, the aeration process improves water quality, encourages fish populations and prevents unpleasant odors. The District also improves water quality in the North Shore Channel and the North Branch of the Chicago River by underwater aeration at two locations.

Wedding and Special Event Photography: While not all SEPA stations are accessible to the public, SEPA Station 4 is a popular destination for wedding and special event portraits. The District welcomes the public to use and enjoy this beautiful setting as a portrait backdrop and there is no fee to do so, but we require that you notify us prior to arrival. Please call the Office of Public Affairs at 312-751-6633 at least 3 days in advance of your planned visit. Also, please be aware that there is no alcohol allowed and no actual ceremonies may take place on the park grounds. The SEPA Station and surrounding grounds are public spaces and cannot be reserved. There will likely be other people, possibly other wedding parties, present on the day of your visit.

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