A sigh of relief on the Hooksmeer: after months of renovation, the Hooksiel lock is to be reopened for passage on Wednesday, 20 May. For motor boaters with moorings on the Hooksmeer or crews who want to head for the idyllic inland waterway, this marks the end of a months-long test of patience. The reason for the delay: an unusually harsh winter with long periods of frost.
Hooksmeer accessible again: Lock opens after renovation
The Hooksiel lock has been closed to boat traffic since 13 October 2025 - a significant restriction for anyone heading to the Hooksmeer with their motorboats or moored there. The lock is the only connection between the tidal Jade and the protected Hooksmeer with the Old Harbour.
The lock, built in 1975, connects the outer harbour with the artificially created Hooksmeer, at the end of which lies the popular Old Harbour of the seaside resort. The sheltered Hooksmeer is a favourite berth for many water sports enthusiasts from all over Germany, safe from the tide and weather. More than 600 pleasure craft are based in the inland deep - for their owners, the 70 metre long and almost eight metre wide lock chamber is the only passage to the Jade.
Comprehensive modernisation of the lock
The Hooksiel lock has been undergoing modernisation by the state-owned port company Niedersachsen Ports (NPorts) since 2023. The more extensive construction work started in September 2024, when NPorts began the gradual refurbishment of all pairs of lock gates (gate lines). The lock has a total of five gate lines, which will be modernised and brought up to the latest state of the art by 2028.
The lock chamber had already been drained last year so that specialist companies could remove the heavy caulking gates. Several pairs of gates are now back in place. Videos and images from Niedersachsen Ports show how the structures, weighing several tonnes, were installed using a special crane.
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In recent years, the ongoing modernisation work has already meant considerable restrictions for pleasure boaters. At times, the lock could only open at a certain water level, which significantly restricted planning reliability for sailors and motor boaters.
Frost stopped the concrete work
Originally, the renovation was supposed to be completed sooner. However, the unusually harsh winter threw a spanner in the works. Long periods of ice made it particularly difficult to work with reinforced concrete, which requires certain minimum temperatures. Despite the adverse weather conditions, work continued as far as possible, according to NPorts.
Airlock with dual function
The lock is not only a passage for boats, but also part of the flood defence line. For safety reasons, certain work may not be carried out in the period from the end of September to mid-April. From April to mid-October is the peak season for boaters - a very small window of opportunity for construction work. For this reason, the work is mainly carried out outside the main season and in several limited closure phases.
As part of the dyke line, it serves to protect the coast. As a connection between the Jade and the Hooksmeer, it ensures the exchange of water, which is vital for the ecosystem of the Hooksieler Binnentief, and drains the Voslapper Groden with its industrial operations.
Trial operation starts on Monday
The construction work in the lock chamber has now been completed - apart from minor remaining work. Over the Ascension weekend, the lock will be in lock operation. This means that the lock is used exclusively for drainage and allows water to flow from inland into the sea, but is not yet open for shipping.
The final trial operation under real conditions will then begin on Monday, 18 May. The main focus will be on work relating to the refurbished caulking gates and the technical testing of the system. The first so-called leak and functional tests are already underway. This involves checking whether the new door lines close properly and the technology works as intended. Only then can a final decision be made as to when the lock will go back into operation.
If all goes well, it will be released on Wednesday afternoon or evening. However, water sports enthusiasts should be aware that there may still be minor closures at short notice as part of the remaining work.
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