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Bezirk Horgen
Thalwil

Sihl–Lake Zurich Relief Tunnel

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Sihl–Lake Zurich Relief Tunnel

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    Tips

    April 13, 2023

    Hiking

    In the event of an extreme Sihl flood, there is a risk of building damage of over 6 billion francs in the city of Zurich alone. A relief tunnel from Langnau am Albis to Thalwil will enable flood peaks from the Sihl to be transferred to Lake Zurich from 2026. This eliminates by far the greatest risk of flooding in the canton of Zurich.
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    April 13, 2023

    Hiking

    Guided tours are offered: etermin.net/est-sihl-z%C3%BCri
    Visit to the information center
    Introduction to the project and construction work
    Guided tour of the construction site in the Sihltal
    The entire program lasts around 2½ hours. Unfortunately, for safety reasons, it is not possible to inspect the tunnel.
    On request, we can also offer groups a guided tour of the information center without visiting the construction site. This takes about 1½ hours.
    Translated by

    May 2, 2023

    Hiking

    What is not communicated at the information stand: The very complex construction project is to be realized for 175 million Swiss francs, with the canton of Zurich taking on the largest share of the costs. This includes various ecological compensation measures. Let's see if the calculation adds up.

    The relief tunnel as far as Thalwil on Lake Zurich should be ready for operation in 2026.
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    Nearby routes

    Best routes near Sihl–Lake Zurich Relief Tunnel

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    #1.

    Sihltal Riverside Trail – Sihlwald Forest Trail loop from Sihlwald

    8.23km

    02:19

    160m

    160m

    Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

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    Moderate

    Hard hike. Very good fitness required. Easily-accessible paths. Suitable for all skill levels.

    Hard

    Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

    Moderate

    Details

    Informations

    Elevation 530 m

    Weather

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    Friday 27 March

    7°C

    -3°C

    86 %

    Additional weather tips

    Max wind speed: 11.0 km/h

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    Location: Thalwil, Bezirk Horgen, Zurich, Switzerland

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