The Innovation Campus in Offenbach is taking shape. On this page, we follow the development of the construction measures step by step. Our construction site diary provides regular insights into the progress, shows important milestones and documents how a future-oriented location is being created here on a historic site.
June 16, 2026
Installation of a bulkhead at the cascade weir
To protect the Innovation Campus site from flooding and heavy rainfall in the future, a cascade weir was anchored about 10 meters deep into the ground. Today, the centerpiece of the system was installed—a bulkhead weighing about 6.5 metric tons. It is approximately 15 centimeters thick, 4 meters high, and 1.30 meters wide.
In the future, the bulkhead will function like a giant backflow valve. During normal operation, it works fully automatically and can be raised and lowered hydraulically depending on the water level and operational requirements to precisely control the flow of water. This prevents water from the Main River from entering the sewer system due to backflow during high water levels and from flooding the site. During heavy rainfall, stormwater can be temporarily retained and released in a controlled manner.
Previous entries 2026
May 27: Sidewalk along Mühlheimer Straße under construction
Work on the sidewalk along Mühlheimer Straße is in full swing. The new sidewalk, which is about 250 meters long, is already taking shape. A bike path and an adjacent green strip are also being constructed alongside it.
Construction on the new sidewalk is expected to be completed in July 2027. However, until the remaining construction work is finished, it will be temporarily used by cyclists.
Only once the new bike path is also completed will the sidewalk be available exclusively to pedestrians.
April 29: Filling the planting holes for new trees along the Innovation Corridor
The first tree troughs that were installed along the new innovation belt were filled with substrate today. The substrate consists of a site-adapted mixture of mineral and organic components.
The filling makes it possible to absorb rainwater, store it temporarily and make it available to the trees as required. The tree troughs are designed in such a way that they provide the trees with sufficient root space and suitable growing conditions, even in a heavily sealed environment.
April 7: Conversion of traffic lights on Mühlheimer Straße
The Mühlheimer Straße/Untere Grenzstraße junction will be equipped with a new traffic light system in the long term. In preparation for this, the current system will be dismantled and temporarily replaced by temporary traffic lights. Work begins today - traffic may be restricted. The temporary traffic lights will go into operation on April 13.
March 21: Guided tours of the Innovation Campus start again
Ida Todisco gives a tour of the Offenbach Innovation Campus.
The guided tours of the Offenbach Innovation Campus met with great interest last year. They will now be offered again in larger numbers in 2026. Offenbach-based author Ida Todisco will guide visitors around the site and provide informative insights into the history of the site, including the listed buildings. Participants can also find out about current developments on the construction site. The guided tours are open to the public and free of charge, but registration is required. The next tour will take place on April 10, but all dates for the first half of 2026 are already fully booked. Further tours are currently being planned.
February 19: Laying of the first tree trenches for the innovation conveyor belt
Until 2014, there were around 710 trees on the site - soon there will be over 800. Parts of the soil are contaminated due to the previous use of the site by the chemical industry. To prevent rainwater from seeping into the ground, concrete infiltration trenches are being installed to collect the rainwater. The trees planted in the trenches absorb the water safely; the rest is drained into the River Main. The innovative concept under the motto "sponge city instead of heat island" ensures that the rainwater remains in the area for a relatively long time, allowing as much evaporation as possible and thus generating cooling effects. Work is currently underway - and the first tree infiltration trenches are already being laid.
February 9: Tree felling work on Mühlheimer Straße
Tree felling work is necessary on the Innovation Campus site. A total of eight trees have to be felled along Mühlheimer Straße. The reason for this is preparations for the new footpath and cycle path.
Another tree will also be felled in the area of the access road via Kettelerstraße. This is necessary in order to lay a channel for the throttled drainage of rainwater from the eastern area of the Innovation Campus into the Kuhmühlgraben. The tree felling work is being carried out today in compliance with all applicable legal requirements and in close coordination with the relevant specialist departments.
January 12: Civil engineering work for footpath and cycle path begins
A new footpath and a separate cycle path are being built along Mühlheimer Straße at the Innovation Campus. These will be built slightly further north than the existing paths and will run directly alongside the Innovation Campus on Mühlheimer Straße.
As a preparatory measure for the construction, empty conduits must now be laid and various supply and disposal lines rerouted. The civil engineering work begins today. These have to be laid from the newly planned future right-turn lane, which will lead from Mühlheimer Straße onto the Innovation Campus, into the final footpath and cycle path.
Work also continued on the rainwater and wastewater sewer near Mainstrasse - the first 100 meters of the new sewers have been laid.
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