La Grande Route de St Jean will be closed in sections over the next 15 months as bigger sewage pipes are laid.
St John's main road will be closed in sections between the St Helier Parks depot and Sion village from November 2025 until February 2027.
This is so contractors working for the government can upgrade the sewage network, which is at maximum capacity.
The work will be done in 10 phases.
It is part of a wider project to reduce flood risks and to connect new and existing houses to the sewage network.
The current 400mm pipes running along St John's main road will be replaced by 600mm pipes to handle 'higher flows' from Sion to the water treatment facilities at Bellozanne.
Two contractors will work on the upgrades at the same time, meaning there might be more than one section closed at a time.
Closures will move along the road as the works are completed.
There will be several drop-in sessions this month for islanders to ask questions about the project:
|
St Helier Parish Hall |
Tuesday 21 October, 10:00 am to 11:30 am |
|---|---|
| Tuesday 28 October, 5:00 pm to 6:30 pm | |
|
St John Parish Hall
|
Thursday 23 October, 10:00 am to 11:30 am |
| Wednesday 29 October, 5:00 pm to 6:30 pm | |
|
The United Reformed Church in Sion |
Monday 27 October, 5:00 pm to 6:30 pm |
|
Trinity Parish Hall |
Thursday 23 October, 5:00 pm to 6:30 pm |
| Thursday 30 October, 9:30 am to 11:00 am |
Schedule of Work:
| Section (works area) | Full road closure location | Dates |
|---|---|---|
|
1 |
La Grande Route du Mont a l'Abbe, across the junction with Le Vert Chemin | January 2026 |
|
2 |
Le Vert Chemin | January to mid-March 2026 |
|
3 |
La Grande Route de St Jean, across the junction with Le Vert Chemin | Late January to mid-March 2026 |
|
4 |
La Grande Route de St Jean, north of the junction with Le Vert Chemin, to south of the crossroads with La Rue de Maupertuis and La Rue du Haut de l'Orme | Mid-March to January 2027 |
|
5A |
La Grande Route de St Jean, across the crossroads with La Rue de Maupertuis and La Rue du Haut de l'Orme | February 2027 |
|
5B
|
La Grande Route de St Jean, a short section north of the crossroads with La Rue de Maupertuis and La Rue du Haut de l'Orme |
February 2027
|
|
6 |
La Grande Route de St Jean, north of the crossroads with La Rue de Maupertuis and La Rue du Haut de l'Orme, to south of the crossroads with La Ruette Pinel and La Rue du Becquet Vincent | 3 November 2025 to February 2026 |
|
7 |
La Grande Route de St Jean, across the crossroads with La Ruette Pinel/ La Rue du Becquet Vincent. | Mid-February 2026 |
|
8 |
La Grande Route de St Jean, north of the crossroads with La Ruette Pinel and La Rue du Becquet Vincent, to south of the junction with La Rue des Hougettes | Late February to mid-October 2026 |
|
9 |
La Grande Route de St Jean, across the junction with La Rue des Houguettes | Mid-October 2026 |
|
10 |
La Grande Route de St Jean, north of the junction with La Rue des Houguettes to north of the United Reformed Church, Sion | Late October to December 2026. |
The first section to close will be north of the crossroads with La Rue de Maupertuis to south of the crossroads with La Ruette Pinel and La Rue du Becquet Vincent.
That will be shut from Monday 3 November until sometime in February 2026.
The government says access for residents and businesses will be maintained, and diversions will be in place.
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