Like Westchester in the Bronx
This cover may be a relic from before the annexation of the Bronx to New York City in 1874. Found in Riverdale it has a design that is occasionally still found in nearby Yonkers.
The wheel and spoke design started early to be associated with sewer covers especially in the Bronx and Manhattan. The 16 vents in the cover appear to be a somewhat hap-hazard affair with rings of 7, 5 and 4 holes.
The central S confirms its function, or is that a dollar sign marking a pot of gold beneath?
There are a few other covers of this type in the north-western Bronx and over the iine in Yonkers, as well as one on Roosevelt Island. This one is at the corner of W 249th St. and the Henry Hudson Parkway.