U.S. Route 20A (New York)

Alternate highway route in New York State

In Sheldon, US 20A intersects NY 77 near Sheldon Center and NY 98 in Varysburg, forming a concurrency with the latter into the adjacent town of Orangeville. Upon crossing the town line, the two routes split, with NY 98 proceeding southwest to Java. US 20A continues southeast from NY 98 on a linear alignment, intersecting the southern terminus of NY 238 at Halls Corner, a small hamlet located near the Orangeville–Warsaw town line. Shortly after passing NY 238, US 20A makes a turn to the east as it enters Warsaw. Roughly 1.5 mile (2 km) from the town line, US 20A descends into the Oatka Valley, a large ravine containing Oatka Creek and the entirety of the Warsaw. Now named Buffalo Street, US 20A heads east–west across the village, intersecting NY 19, one of two state routes to directly connect Lake Ontario with the Pennsylvania state line, at the center of Warsaw. Past the NY 19 junction, US 20A continues east along Buffalo Street to the eastern edge of the village and the valley, where the route turns a full 90 degrees to the north to climb the side of the Oatka Valley. The route ascends approximately 300 feet (91 m), passing under the Rochester and Southern Railroad (RSR)—which runs along the foot of the gorge—before exiting the valley and returning to an east–west alignment as it heads toward Perry and points east. All oversize trucks are prohibited from using the section of US 20A between NY 19 and Minor Road at the top of the valley due to the steep grade of the hill and the sharp curve at the bottom.

Outside of the Oatka Valley, US 20A heads east through the remainder of the town of Warsaw prior to entering the town of Perry. The route serves Perry–Warsaw Airport on its way to Perry Center, a small hamlet situated directly north of the village of Perry, where US 20A intersects NY 246. The portion of US 20A in Perry is otherwise uneventful, and the route quietly passes into the Livingston County town of Leicester 2.5 mile (4 km) later. After another 1 mile (2 km) of rural surroundings, US 20A meets NY 39 at a junction approximately 1.5 mile (2 km) southwest of the village of Leicester. The two routes converge, following Leicester Road northeast to the village, where the highway's name shifts to Main Street upon entering the village limits. East of a grade crossing with the Genesee and Wyoming Railroad subdivision of the RSR, US 20A and NY 39 connect to NY 36 at York Road. NY 36 briefly overlaps with US 20A and NY 39 for one block before heading to the south via Mount Morris Road at the village center. US 20A and NY 39 continue on, leaving Leicester on as Cuylerville Road, named for the community located directly northeast of Leicester. The routes pass in and out of Cuylerville and head eastward into a wide valley, crossing Beards Creek and the Genesee River. At the eastern bank of the latter, the highway crosses into the town of Geneseo. On the other side of the Genesee River, US 20A and NY 39 rise in elevation once more as they head to the northeast, climbing the eastern edge of the gully to meet NY 63 at the valley's eastern edge. After a brief concurrency with US 20A and NY 39, NY 63 splits off to the west, running alongside the western edge of the nearby State University of New York at Geneseo campus. In contrast, US 20A and NY 39 form a portion of the eastern edge of the campus between NY 63 and Mary Jemison Drive in the village of Geneseo. At the latter intersection, US 20A and NY 39 turn east onto South Street. After just one block, the US 20A/NY 39 overlap comes to an end as NY 39 follows Main Street north out of Geneseo toward Avon. US 20A continues east through Geneseo before taking on a more northeasterly alignment outside of the village. At this point, the highway becomes Lakeville Road for the Conesus Lake community to the northeast. The route proceeds across open terrain to the western outskirts of Lakeville, where US 20A connects to I 390 at exit 8. Past the expressway, US 20A continues on a northeast alignment—albeit more eastern than northern—as it intersects NY 256 and enters both the town of Livonia and the hamlet of Lakeville.

As Big Tree Road once more, US 20A acts as the major east–west thoroughfare for Lakeville, connecting the hamlet to I 390 in the west to the village of Livonia to the east. In the center of Lakeville, US 20A intersects the north–south NY 15. The two routes converge on Big Tree Road, following the roadway around the northern tip of Conesus Lake and southeastward through the rural landscape between Lakeville and Livonia. In Livonia, Big Tree Road continues to the southeast as Big Tree Street; however, US 20A and NY 15 leave Big Tree Road to follow Main Street instead. NY 15 remains on US 20A for one more block to the center of Livonia, at which point it continues southward on Commercial Street toward Conesus while US 20A heads east on Main Street and out of the village as Richmond Mills Road. For the next 2.5 mile (4 km), US 20A loosely parallels Big Tree Road, located about 1 mile (2 km) to the south. At a rural junction known as Bosley Corner, US 20A merges with the north–south NY 15A and follows NY 15A south toward the hamlet of Hemlock. While concurrent with NY 15A, US 20A crosses Big Tree Road at the midpoint of the concurrency. The two routes proceed through Hemlock before splitting south of the community. Here, US 20A breaks from NY 15A and continues east on Honeoye Road into the Ontario County town of Richmond. About 2.5 mile (4 km) into the sparsely developed town, US 20A reconnects to Big Tree Road at Curtis Corner. The route, however, becomes Main Street for the hamlet of Honeoye a short distance to the east. US 20A runs east–west through the small yet highly developed community, crossing Honeoye Creek and passing north of Honeoye Lake. It leaves the hamlet soon after, turning to the northeast and traversing a series of small hills as it passes into the town of Bristol as Honeoye Road once again. Roughly 4 mile (6 km) from the town line, US 20A intersects NY 64 in the Bristol Valley. US 20A turns north onto NY 64, following the state route out of the valley and into the town of East Bloomfield, where US 20A ends 4 mile (6 km) later at an intersection with US 20 and NY 5. The section of US 20A that overlaps NY 64 was signed north–south, matching NY 64's direction, however, the US 20A north–south tabs were replaced by east–west tabs between 2010 and 2012, but still the north–south tabs are now for NY 64 shields only. NY 64 continues west from the junction on US 20 and NY 5.

In 1908, the New York State Legislature established a statewide legislative route system that initially consisted of 37 unsigned routes. The portion of what is now US 20A between Four Rod Road in Wales and NY 98 in Sheldon was included in Route 19, a highway that extended from Buffalo to Batavia. Two smaller segments of modern US 20A—the sections concurrent to NY 16 in East Aurora and NY 64 in Ontario County—became part of Route 17 and Route 14, respectively. When the first set of posted routes in New York were assigned in 1924, the entirety of legislative Route 17 was designated as part of NY 16 while the portion of modern US 20A between Lakeville and Livonia became part of NY 4. By 1926, the section of what is now US 20A between NY 16 in East Aurora and NY 4 in Lakeville was designated as part of NY 35, which initially continued northwest to Buffalo by way of an overlap with NY 16 and followed NY 4 north from Lakeville to NY 5 in East Avon. NY 35 was largely replaced by US 20 when U. S. Highways were first signed in New York in 1927. At the time, US 20 entered the Buffalo area on modern NY 5 and followed Big Tree Road and current US 20A east to East Aurora, where it overlapped NY 16 to reach the former routing of NY 35. From there, it continued east over former NY 35 to Geneseo before proceeding to Avon on modern NY 39. Meanwhile, NY 4 was renumbered to NY 2 to eliminate numerical duplication with the new US 4 in the Capital District. The portion of former NY 35 between Geneseo and Lakeville went unnumbered until the 1930 state highway renumbering when it became the westernmost portion of NY 254, an east–west highway that initially extended eastward along modern US 20A and CR 32 to a junction with NY 21 west of Canandaigua. NY 254 was truncated westward to NY 64 in Bristol by the following year. US 20 was realigned between Geneseo and East Avon c. no – c. 1931 to follow NY 254 east to Lakeville, where it turned north to follow NY 2 to East Avon. NY 254 was truncated to the east end of its former overlap with NY 2 in Livonia as a result while US 20's former routing between Geneseo and Avon became NY 20D. US 20A was established by the following year, replacing NY 20A west of Geneseo and NY 254 from Geneseo to Bristol. The new highway also followed NY 64 northward to East Bloomfield in order to rejoin US 20 in the hamlet of South Bloomfield. NY 254 was reassigned to the Geneseo–Avon portion of NY 20A; however, it was supplanted by an extended NY 39 c. no – c. 1940.

On the morning of March 12, 1994, a large section of the roof in the southern end of the Retsof Salt Mine collapsed. The collapsed portion of the mine was located near the hamlet of Cuylerville, located on US 20A just south of the mine. One day before the collapse, warning signs were erected at the bridge carrying US 20A over nearby Beards Creek due to the presence of bumps in the pavement along the bridge approaches. Over the next few weeks, two large sinkholes opened on the surface above the mine, one of them located just south of the US 20A bridge over Beards Creek. This sinkhole led to the collapse of a small area of US 20A east of the creek and the closure and, ultimately, collapse of the bridge over the creek. As a result, a detour was installed between Leicester and Geneseo. No construction was done on the area for a number of years while a court battle was fought over whether Retsof should reimburse the New York State Department of Transportation to fix the road. The road and new bridge were fixed and reopened in the late 1990s. On June 18, 2008, a bill seeking to rename the part of US 20A from Abbott Road to California Road as the "Timothy J. Russert Highway" was introduced in the U. S. Senate. The bill, sponsored by Senators Chuck Schumer and Hillary Clinton along with Representative Brian Higgins, was passed by both the House and the Senate and was signed into law by President George W. Bush on July 23, 2008. The designation is in memory of Buffalo native Tim Russert, the long time host of NBC's Meet the Press who died on June 13, 2008.