The Gowanus Canal: Butler Street
The "headwaters" of the Gowanus Canal are a pumping station built in 1911 to pump seawater through a tunnel that brings water from Buttermilk Channel in upper New York Bay to the west and creates a waterflow out of the canal into Gowanus Bay. The facility features a single 7-foot-diameter propeller driven by a 600 horsepower (500 kW) electric motor that can move 200 million gallons of water per day.
Across the street from the pumping station is the Brooklyn chapter of the American Society for the Prevention of Cruelty to Animals (ASPCA). Note the unused horse trough in front of the building "Presented to the ASPCA by Edith Bowdoin 1913" that is similar to a pair of troughs she placed in Central Park and Flushing.
Just to the northeast of the pumping station is Wyckoff Gardens, a 527-unit NYC housing authority development that opened on December 31, 1966.

Gowanus Canal Pumping Station (Butler Street side)

Gowanus Canal Pumping Station

Gowanus Canal Pumping Station

Looking south at the Gowanus Canal from the pumping station

Gowanus Canal Pumping Station (Douglass Street side)

Gowanus Canal Pumping Station

Swirling water from the pumping station

Brooklyn ASPCA - 233 Butler St

Brooklyn ASPCA

Bowdoin horse trough

Brooklyn ASPCA (Rogers Memorial)

Wyckoff Gardens - Baltic at Nevins St

Wyckoff Gardens

Wyckoff Gardens