Friends of East River Esplanade set up a banner along the waterfront near 117th Street.
The Friends of the East River Esplanade want to create a public art installation in the space.
Opponents want more action to stop the Upper East Side's marine transfer station from being built.
A controversial East 91st Street waste facility could cost the city more than $400 million, foes say.
Nearly 300 residents voiced concerns to city officials Monday about the E. 91st Street trash station.
An appeals court said legislative approval isn't needed for trash station ramp at Asphalt Green since it's not a public park.
Upper East Siders are fighting a garbage dump next to their popular Asphalt Green ball fields.
Upper East Side community groups want signs, crosswalks and crossing signals to help pedestrians reach East River park.
A new conservancy dedicated to improving the esplanade from East 60th to 125th streets will debut May 21.
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