Small Dean Viaduct

{{Use dmy dates|date=July 2020}}

{{Use British English|date=July 2020}}

{{Infobox bridge

| name = Small Dean Viaduct

| image =

| caption =

| coordinates = {{Coord|51.7500|-0.7368|display=inline,title|region:GB_type:landmark}}

| os_grid_reference =

| carries = High Speed 2

| crosses = A413 road

| locale = Wendover

| official_name =

| maint =

| heritage =

| owner =

| operator =

| traffic =

| notrack = 2

| gauge = {{Track gauge|Standard gauge}}

| electrification = {{25 kV 50 Hz AC}}

| architect = Moxon Architects

| designer = ASC (Arcadis, Setec and COWI)

| length = {{convert|345|m|abbr=on}}

| width =

| height =

| number_spans = 6

| builder = EKFB (Eiffage, Kier, Ferrovial, BAM Nuttall)

| fabricator =

| open =

| extra =

}}

Small Dean Viaduct is a viaduct currently under construction in Buckinghamshire which will carry the High Speed 2 railway line.

Approval for the viaduct was granted by Buckinghamshire Council in April 2023.{{Cite web |date=2023-04-20 |title=HS2 viaduct approved in Wendover countryside |url=https://www.bbc.co.uk/news/articles/cl46y44lvm8o |access-date=2024-12-24 |website=BBC News |language=en-GB}}

The viaduct is {{Convert|345|m|ft|abbr=off}} long and will pass over the A413 road which will be realigned. A shared-use path will also be provided.{{Cite web |title=Small Dean Viaduct |url=https://www.hs2.org.uk/building-hs2/viaducts-and-bridges/small-dean-viaduct/ |access-date=2024-12-24 |website=HS2 |language=en-GB}}

The viaduct will have a low profile with the underside of the viaduct {{Convert|6|m|ft|abbr=off}} above the road surface below. It will be supported by five Y-shaped piers and girders made from weathering steel.{{Cite web |title=Small Dean Viaduct clears planning |url=https://www.theconstructionindex.co.uk/news/view/small-dean-viaduct-clears-planning |access-date=2024-12-24 |website=www.theconstructionindex.co.uk |language=en}}