Central Park is getting plumbing most visitors will never see. Construction started Oct. 26 on the $35.7 million North End Recirculation System, a buried network of pumps, filters and pipe that ties the park’s three northern water bodies together and turns Harlem Meer into stormwater storage ahead of big storms.
Today the Pool, the Loch and Harlem Meer are topped up with city drinking water, and runoff from the surrounding park drains into combined sewers serving Harlem and East Harlem. The new Central Park stormwater system is built to stop both, ENR reported.
How the Central Park stormwater loop works
In dry weather, pumps will push water from the Meer south to the Pool. It’s filtered there, then runs by gravity through the Loch and back into the Meer. Ahead of a major storm, operators will be able to draw the Meer down to make room for runoff from a 204-acre slice of the park.
The Central Park Conservancy and city officials project the loop will keep about 132 million gallons a year out of local sewers, save 175 million gallons of drinking water and cut stormwater flows to combined sewers from the managed area by 90%. Those are design projections. Nobody will know the real numbers until it’s running.
Building stormwater infrastructure in a landmarked park
The construction is where this gets interesting. Central Park is a National Historic Landmark, on the National Register and a city landmark, so almost everything goes underground. Filtration sits in below-grade vaults near the Pool and the south end of the Meer. Recirculation pipe runs about 5 feet down across the North Meadow and Mount St. Vincent. At the Meer, suction and filter-discharge piping goes in about 3 feet deep, while the filtration vault and a pump wet well near East Drive reach about 15 feet. A new drain will tie the Pool to a sewer main at Eighth Avenue and West 98th Street.
Crews will also dredge sediment to restore the Meer’s original depth, and archaeological testing from April 2025 flagged stretches near the old Kingsbridge Road, Mount St. Vincent and the western park edge for monitoring during digging. Shorelines get gabion bases under boulder edges and coir logs elsewhere, plus new aquatic and upland plantings.
eDesign Dynamics designed the system, and the Conservancy is running the work with the city’s Department of Environmental Protection and Parks Department. ENR didn’t name a contractor. Funding includes more than $19.6 million in city capital money, $14.2 million of it from DEP, plus a $10 million Green Resiliency Grant from New York State. Completion is set for fall 2028.
Why green infrastructure owners should watch
Most combined-sewer fixes mean tunnels, tanks or big plant work, like the Battery E job at the O’Brien Water Reclamation Plant outside Chicago. This one uses water bodies that already exist as the tank. If a 90% cut holds up, it’s a cheap template for any city park with a lake and a sewer problem. Conservancy CEO Betsy Smith called it “our most ambitious infrastructure project to date,” and at $35.7 million, it’s small money by combined-sewer standards.