On January 1, 1970, NY 205 was officially extended southward to meet I-88 at what is now exit 13. In reality, however, NY 205 continued to begin at NY 23 for most of the early 1970s as all of I-88 had yet to be built. The extension finally materialized following the completion of I-88 in the vicinity of Oneonta. The newly extended NY 205 connected to the freeway by way of a overlap with NY 23 and a new highway linking NY 23 to an interchange with I-88 at the Oneonta city line.