Johan Friso lock
The Johan Friso lock ( Dutch: Johan Frisosluis , West Frisian Johan Frisoslûs , named after Johan Friso of Orange-Nassau ) is located in Stavoren (municipality of Southwest Fryslân ) in the Dutch province of Friesland and is a network of two locks . It connects the Prinses-Margriet Canal and the Johan Friso Canal with the IJsselmeer . It is the successor to the old Stavorens lock, the Zeesluis, after it was closed. The construction of the Johan Friso lock began in 1966 .
The lock system is used almost exclusively by sports and leisure shipping. It consists of two locks of different sizes, the southern lock chamber being used for traffic to the IJsselmeer and the northern one for inland traffic. As a skipper of a sports boat , if you want to go out to sea, you are obliged to tie up in the waiting area provided on the left bank and wait for the lock to open. Exceptions are indicated by white arrows in front of the two lock gates, in which case the lock chamber pointed to by the arrow must be entered.
The northern lock chamber has a length of 60 meters, a width of nine and a depth of 3.10 meters. In addition, a bascule bridge leads over the lock gate to the interior of the country, which limits the maximum passage height when the bridge is unopened to 1.75 meters. The southern, newer chamber is larger than the older one. It has a length of 65, a passage width of seven and a depth of at least 2.60 meters. A 1.75 meter high bascule bridge also leads over it.
While the old lock from 1966 was created artificially, i.e. made entirely of concrete , the newer one is a pilot project from Stavorens and is known as the green lock . It is completely natural and no artificial materials were used in the foundation , which means that it is a pure excavation and apart from necessary places such as the lock gates, no aids such as concrete or similar were used. The lock chamber has solid walls, the boats make rather on a floating dock from steel solid, which with the water level moves the lock. From there, as from the mainland, you can get to the specially newly established information center of the lock. Furthermore, natural elements such as some pond plantings (grass etc.) were added.
The old tower, from which the lock was operated until 2014, was replaced by a new control tower on the southern side. From there, the bascule bridges over the lock chambers as well as the bascule bridge over the Johan Friso Canal in Warns, about 2 km away, are controlled remotely. In the new tower there is also complete camera surveillance of the entire lock area, an announcement system and a light barrier in front of both bridges, which signal to the bridge keeper that there is possibly a slight difference between the clearance height of the bridge and the ship and that the ship should open the bridge. This facility was installed because the two-story tower is almost eight meters high and from there it is usually not possible to see whether the opening of the bridge is actually necessary. As with the lifting bridges in the province of Friesland , the Rijkswaterstaat regulation applies that passage is only possible if there are several vehicles. Longer waiting times of up to two hours, however, only come about in the high season when there is an overload despite the large capacity .
- ANWB (Ed.): Wateralmanak - Vaargegevens 2018 . tape 2 , ISBN 978-90-18-04167-0 .
- Johan Frisosluis. (No longer available online.) Archived from the original on August 11, 2018 ; Retrieved August 11, 2018 (Dutch). Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- Auke Jan Andringa: Koninklijke opening Johan Frisosluis. In: anteagroup.nl. Retrieved August 11, 2018 (Dutch).
- Provincie Fryslan: Animatie van de nieuwe Johan Friso Luis in Stavoren. May 19, 2011, accessed August 11, 2018 .
- Aerial view of the lock