Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. First Avenue is a north-south thoroughfare on the East Side of the New York City borough of Manhattan, running from Houston Street northbound for over 125 blocks before terminating at the Willis Avenue Bridge into The Bronx at the Harlem River near East 127th Street. South of Houston Street, the roadway continues as Allen Street south to Canal Street. Traffic on First Avenue runs northbound (uptown) only.