ALBANY — New York City’s rapidly deteriorating bridges pose a serious threat to the entire Northeast, Lt. Gov. Richard Ravitch warned yesterday.

And the state, he said, has “no credible strategy” to pay for such already announced megaprojects as the long-delayed replacement of the 55-year-old Tappan Zee Bridge and the pre-World War II Kosciuszko Bridge.

His latest report on the fiscal crises facing the state says new taxes and higher fares and tolls are needed, along with drastically reduced environmental reviews for mass-transit projects.

Gov.-elect Andrew Cuomo did not immediately respond to a request for comment.