The city has quietly opened two new emergency shelters for migrants on the Upper West Side — totaling nearly 250 rooms within a three-block stretch.

The new emergency shelters — among 98 in the city have opened in response to the migrant crisis — will be in the New York Institute of Technology’s Riverside Terrace Residence Hall on West 88th Street, which has a capacity of 125 rooms, and the 119-room Belnord Hotel on West 87th Street, according to emails obtained by The Post.

The pair are in addition to a controversial new 108-bed “safe haven” shelter on West 83rd Street, across the street from an elementary school, and operated by the nonprofit Breaking Ground. That facility will welcome vagrants without conducting criminal background checks on them.

“Bottom line is, they are bombarding us,” said Donna Grace, who attends her Redeemer Presbyterian church’s community group on West 87th Street, near one of the emergency shelters.

“It’s going be the beginning of a gradual decline of our beautiful, historic, desirable neighborhood,” she said.

During the pandemic, the Belnord, along with the nearby Lucerne and Belleclaire, was turned into a shelter for homeless men to purportedly prevent COVID-19 outbreaks in shelters — resulting in soaring complaints of public drug use, urination, and even sexual activity in the street, according to residents.

“We did not have a positive experience during COVID with how things were communicated and or implemented and overseen,” said Upper West Sider Nicole Metzger, 47, who recounted walking by homeless men shooting up, passing out, and even receiving oral sex. “We have heightened fears that this is a repeat of the situation.”

And the Upper West Side has been completely saturated with shelters, neighbors complained.

“We all know that we have a crisis with homeless people and that they need housing, but every neighborhood has to step up and do its fair share, and the West Side is clearly doing much more than its fair share,” said community activist Maria Danzilo. 

The new emergency shelters come in addition to the 1,352 people already living in city Department of Homeless Services facilities in the neighborhood, compared to just 41 on the ritzy Upper East Side and just 438 in the Financial District, according to city data as of Feb. 28 

Community Board 7 District Manager Max Vandervliet urged the city Department of Social Services to give local leaders and the neighborhood more advanced notice for shelter openings.

“We do not intentionally leave constituents in the dark,” Vandervliet said. “I can state accurately that in some instances we have been notified about a shelter the day of, the day before, and on occasion after its opening.”

Public hearings are not required to open emergency shelters, according to DSS, which would not confirm the shelter locations or share costs.

“We need every community to come together to respond to this humanitarian crisis as we continue to use every tool at our disposal to ensure that we are meeting the unprecedented need for shelter services on the ground,” a DSS spokesperson said. 

It is unclear how much the city will fork over to cover the new Upper West Side emergency shelters. 

The Adams administration last month said it was costing $364 a day to provide shelter and food for one migrant household.

33,400 migrants out of the 53,000 that have come to New York City since last spring are staying in city-run hotels, according to the latest City Hall data. 

Overall, the migrant influx has cost the city $420.44 million and counting in emergency shelter spending.

The West Side Rag previously reported the shelter population data.