8 Sewer Outfalls Around the World That Will Surprise You

Sewer outfalls are not usually on the list of places to visit for urban explorers, but there are some that are worth checking out. These structures play a critical role in the management of wastewater and stormwater, allowing them to flow into larger bodies of water without causing pollution or flooding.

Here are eight sewer outfalls around the world that might pique your interest:

1. The Milwaukee Deep Tunnel Outfall – Milwaukee, Wisconsin
The Milwaukee Deep Tunnel is an underground system designed to prevent sewage overflows into Lake Michigan during heavy rainfall. Its outfall structure is located near Jones Island and looks like a giant concrete pipe jutting out of the water. While it’s not accessible for exploration, it’s still an impressive feat of engineering.

2. The River Tyburn Outfall – London, England
The River Tyburn is one of many rivers that have been buried under London’s streets over time due to urbanization. Its outfall can be seen at low tide near Vauxhall Bridge and features an ornate stone arch with carved lion heads.

3. The Flushing Bay Combined Sewer Overflow Retention Facility – Queens, New York City
This facility was built as part of New York City’s efforts to reduce combined sewer overflows (CSOs) into Flushing Bay during heavy rain events. It stores up to 43 million gallons of stormwater and wastewater until it can be treated at a nearby plant.

4. The Tapiola District Wastewater Treatment Plant Outfall – Espoo, Finland
Located in a residential area just outside Helsinki, this treatment plant has an eye-catching orange-and-white striped tower for its effluent discharge point into the Baltic Sea.

5. The Kallang River Diversion Drainage Scheme Outfall – Singapore
Singapore is known for its innovative infrastructure solutions, including this drainage scheme which diverts excess stormwater from Kallang Basin via underground tunnels towards the sea. Its outfall structure resembles a futuristic metal sculpture.

6. The Black River Tunnel Outfall – Lorain, Ohio
The Black River is an important tributary of Lake Erie, and its tunnel outfall in Lorain has been recently renovated with colorful LED lights that change according to the water level.

7. The Los Angeles County Sanitation Districts Joint Water Pollution Control Plant Outfall – Carson, California
This treatment plant serves over 5 million people in the Los Angeles area and discharges treated wastewater into the Pacific Ocean via a massive concrete pipe that stretches for miles offshore.

8. The Sävö Strainer Dam Outfall – Porvoo, Finland
This small town on Finland’s southern coast is home to an unusual dam that filters debris from water flowing into the Gulf of Finland through a series of rotating metal drums. The outfall tower resembles a lighthouse and offers stunning views of the surrounding archipelago.

While sewer outfalls may not be glamorous or tourist-friendly destinations, they are vital pieces of infrastructure that protect public health and promote environmental sustainability. If you’re interested in urban exploration or engineering marvels, consider adding one (or more) of these locations to your next itinerary!