New York State Route 3A

NY 3A begins at an intersection with NY 3 in the village of Deferiet. It heads northeastward, passing to the south of the village center as it heads through an undeveloped area of the community. It continues across a small canal and past a chemical plant before turning eastward and leaving the Deferiet village limits. The route heads on through the town of Wilna, passing through a small, unnamed community built up around CR 37 and little else before entering the limits of Fort Drum. While in Fort Drum, NY 3A heads through a dense forest as it heads across an area with no development whatsoever. This trend finally ceases in the small hamlet of Fargo, where NY 3A passes by a handful of buildings before ending at another junction with NY 3. All of NY 3A is maintained by Jefferson County; as a result, it is co-designated and co-signed as CR 36. ==History==

NY 3 originally went through Carthage on its way from Deferiet to Fargo. It was realigned to bypass Carthage to the north on modern NY 3A. The former routing of NY 3 between Deferiet and Carthage was originally designated as NY 3F; however, it was redesignated as NY 3G by the following year. NY 3 was moved back to the Deferiet–Carthage–Fargo alignment while the NY 3G designation was transferred to the former routing of NY 3 between Deferiet and Fargo. The NY 3G designation was removed in the 1940s. Its former routing remained unnumbered until September 1950, when it was redesignated as NY 3A. ==Major intersections==