HS2 in Hertfordshire
HS2 in your area
Our railway clips the south-eastern edge of Hertfordshire. It stays in deep tunnels as it moves between the London tunnels and the Chiltern tunnel.
What we are building in Hertfordshire/South Buckinghamshire (Chilterns)
Colne Valley viaduct
The Colne Valley viaduct stretches for more than 2 miles (3.4km). It crosses a series of lakes and waterways between Hillingdon and the M25.
Learn more about the Colne Valley viaduct or read about the HS2 works and developments taking place in Hertfordshire
Chilterns chalk grassland
The western slopes of the valley of River Colne are dedicated habitat creation sites. We’re creating over 90 hectares of chalk grassland alongside new areas of woodland, wood pasture and wetlands, including almost 65,000 trees and shrubs of 32 species and nearly 2 miles (3.5 km) of new hedgerows.
Learn more about the Chilterns chalk grassland or read about the HS2 works and developments taking place in Hertfordshire
Chiltern tunnel (south portal)
Chiltern tunnel is the longest tunnel on the HS2 route, stretching 10 miles (16km) beneath the Chiltern Hills.
Learn more about the Chiltern tunnel or read about the HS2 works and developments taking place in Hertfordshire
Managing impacts of construction
We're working to minimise disruption to local residents and businesses, reduce the impact on roads and transport, minimise our impact on the environment, and keep communities informed at every stage.
Current work in the area
Local area information
We’re making sure HS2 provides the best value for Britain by carrying out a full review of the programme for the government.
Our CEO Mark Wild is resetting HS2’s cost and schedule. He successfully led Crossrail’s recovery in the wake of major challenges. This led to the successful opening of the Elizabeth line – now the busiest in the UK.
Email newsletters
Subscribe to our regular updates about the project, including notifications of our upcoming works, how it’s being constructed and what we’re doing to make it less disruptive.