page_title: Delaware Route 100
section_title: Route description
hierarchical_section_title: Delaware Route 100 / Route description
caption_attribution_description: Northbound Delaware Route 100 (Montchanin Road) past the intersection with Kirk Road in Montchanin, Delaware
context_page_description: Delaware Route 100 is a state highway in New Castle County, Delaware. The route runs from DE 4 near Elsmere to the Pennsylvania border near Montchanin, where it continues into Pennsylvania as State Route 3100. The road runs through suburban areas of northern New Castle County. It intersects with DE 2 in Elsmere before forming separate concurrencies with DE 48 and DE 141 from west of Wilmington north to Greenville. In Greenville, there is an interchange with DE 52. North of Greenville, DE 100 continues by itself to the Pennsylvania border, intersecting DE 92 in Montchanin. DE 100 was first designated in the 1930s to run from DE 52 to the Pennsylvania border, where it originally connected to Pennsylvania Route 100. By the 1970s, it was extended south to DE 4. The route was realigned to follow parts of DE 48 and DE 141 by 1990.
context_section_description: DE 100 begins at an intersection with DE 4 southwest of the city of Wilmington, heading north on the one-way pair of Race Street northbound and South Dupont Road southbound. The one-way pair, which carries two lanes in each direction, passes through suburban residential areas. Both directions of the route join, with the route continuing northwest as South Dupont Road, a four-lane divided highway. DE 100 curves north and enters the town of Elsmere, where it runs through industrial areas and comes to a bridge over Little Mill Creek and CSX's Philadelphia Subdivision railroad line. A short distance later, the route crosses DE 2 and becomes North Dupont Road, where it becomes an undivided road and passes over an East Penn Railroad line on a bridge. The road continues through wooded residential areas, leaving Elsmere and becoming South Dupont Road. The route reaches an intersection with the eastern terminus of Faulkland Road. Following this intersection, DE 100 passes to the east of a cemetery before reaching an intersection with DE 48 south of the Cab Calloway School of the Arts and Charter School of Wilmington.
  At this point, DE 100 turns northwest to form a concurrency with DE 48 on four-lane undivided Lancaster Pike, passing through business areas before crossing the East Penn Railroad at-grade. The road continues through residential and commercial areas, crossing Chestnut Run and widening into a divided highway as it comes to an intersection with DE 141. Here, DE 100 splits from DE 48 by turning northeast to join DE 141 on four-lane divided Centre Road. The road runs through industrial areas, curving north past the Barley Mill Road intersection. The roadway curves northeast and passes under the East Penn Railroad before coming to a partial cloverleaf interchange with DE 52 in Greenville. This interchange has no access from DE 100/DE 141 southbound to DE 52 southbound or from DE 52 to DE 100/DE 141 northbound. Past this interchange, the road curves east, with DE 100 splitting from DE 141 at an at-grade intersection by heading north on two-lane undivided Montchanin Road. Montchanin Road heads south from this intersection to provide access to DE 52.
  DE 100 continues north through wooded areas with fields and homes, crossing the East Penn Railroad line again at-grade. The road runs through Montchanin and passes to the east of the Wilmington Country Club before crossing the railroad tracks again at-grade and coming to an employee entrance to the Winterthur Museum and Country Estate to the west. The route intersects the western terminus of DE 92 and Adams Dam Road on the western edge of Brandywine Creek State Park. At this point, DE 92 continues straight to the northeast and DE 100 turns north to remain on Montchanin Road, heading across Wilson Run. The road crosses under the East Penn Railroad again and curves northwest, reaching an intersection with Center Meeting Road/Smith Bridge Road. DE 100 bends to the north again before reaching its northern terminus at the Pennsylvania border, where the road continues into that state as SR 3100 (Chadds Ford Road). The Montchanin Road portion of DE 100 is part of the Brandywine Valley National Scenic Byway, a National Scenic Byway and Delaware Byway.
  DE 100 has an annual average daily traffic count ranging from a high of 43,842 vehicles at the DE 52 interchange along the DE 141 concurrency to a low of 2,126 vehicles at the Pennsylvania border. The portion of DE 100 concurrent with DE 141 is part of the National Highway System.
caption: DE 100 northbound in Montchanin
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