Two new weirs at Hooiweg

Work Schedule 

New weirs

Contractor Oosterhuis has begun preparatory work for the construction of two new weirs Hooiweg/Matsloot. The weirs named Vischluststuw (northern weir) and Rowolderstuw (southern weir). Under normal conditions, the weirs are weirs , allowing water to flow freely.When the additional balancing lake is used, these weirs balancing lake weirs to retain water.The schedule is designed so that work on the weirs will be sufficiently advanced weirs the first half of 2026 to allow weir operation of the northern weir and closure of the southern channel. If necessary, the additional balancing lake will already be partially operational balancing lake .

Modification of the Doolhof Weir

In addition to constructing the new weirs, we are modifying the existing Doolhof Weir at the Peizerdiep (see photo below). It will be raised and fitted with a new gate. The flood embankments both sides of the weir will also be weir . 

Construction work is expected finalised 2026 in time for the breeding season.
In the first quarter of 2026, we will also begin raising flood embankments implementing nature conservation measures and additional measures. The full expansion of the balancing lake finalised in 2027. 

What can you see and notice about the work? 

• In the coming weeks, further archaeological research will first be conducted as a follow-up to previous work. It is possible that additional remains of peat mounds, house sites, or other features may be discovered.
• The contractor will then begin removing obstacles and mowing the area. Starting in week 41, peat will be excavated and sand will be brought in.
• The contractor takes nature into account during the work (breeding season, animal safety, and other measures). Ecologists from the water authority involved in the work. View the ecological work protocol.

Transport routes during work

Peat weirs removed and sand brought in for the two new weirs . Soil will also be needed to raise flood embankments the Doolfhofstuw. In addition, equipment will be transported to the construction site. 
The map below shows the transport routes. Trucks will travel via Hooiweg/Matsloot (the red line) carrying materials for the construction of the weirs. Soil transport will take place via the Cosun path and Roderwolderdijk (purple line).  
During the work on the weirs, public roads will remain open to other traffic. However, traffic may experience some disruption due to the freight traffic. Immediate neighbors will receive additional information about this.