Mundaring Weir

Full of educational, historical and natural attractions, Mundaring Weir is both a vital source of water for Western Australia and a lovely place to visit.

Upgrade underway April 2017– February 2018

Work to upgrade assets at the Mundaring Weir including, an upgrade of the intake tower and associated pipework, will take place between April 2017 and February 2018. This work will reduce the surface area of the dam, saving 1.5 billion litres of water per year from evaporation.

Mundaring Weir plays a vital role in suppling water to towns in our Goldfields and Agriculture areas. To ensure we can meet demand during peak flow periods, like many of our dams, Water Corporation transfers water produced from deep groundwater and desalination into the reservoir. Once complete, this project will allow more flow to leave the reservoir at a reduced surface level. Without the need to top up the dam, this will allow over 8 million litres of water to be used elsewhere across the IWSS (Integrated Water Supply Scheme.)  

Work will take place between 7am–5pm on Monday to Friday, and 7am–12pm on Saturdays.

To ensure public safety during construction, the dam walkway will be closed and the Bibbulmun Track will be diverted until Wednesday, 28 February 2018.

We urge visitors to the Mundaring Weir to take note of the project signage in place, stay within the Bibbulmun Track diversion, remain vigilant and take care while in the area.

The National Trust PS1 Museum will remain open as per usual.

For more information:

Please contact Community Engagement Officer Larissa Stanley on (08) 9240 2789 or email


Please note: There are also some instances when our dam recreation areas will be closed, particularly in summer when there may be a bushfire risk. Before planning a visit to one of our dams, phone us 24 hours on 13 13 75 or check our Facebook page for a post about dam closures.

Dam information

  • Capacity – 63.6 million kilolitres 
  • Catchment area – 1,470 square kilometres 
  • Length of wall – 308 metres
  • Height of wall (above riverbed) – 42 metres 
  • Water from Mundaring Weir is supplied to the Goldfields and Agricultural region. We transfer desalinated seawater and groundwater into Mundaring Weir to supplement this water supply.

What to do?

Parkland at Mundaring Weir

Parkland at Mundaring Weir

Enjoy an outdoor lunch with the family at one of the many beautiful picnic spots. Free gas barbecues are provided.  
Marked nature walks around the Weir allow you to stroll through the native bush without damaging it. If you prefer to relax, just sit back and watch the kids enjoy the playground facilities.

From July to November you can observe wildflower season and enjoy the striking array of native flowers.

Visit the No1 Pump Station to learn about the incredible early engineering feat of pumping water nearly 600km from Mundaring Weir to the Goldfields. 

Visitor information

Photograph of the Mundaring Weir Suction No.1

Suction tank at Mundaring Pump Station

General opening times

Mundaring Weir is open every day of the week until 6pm (closes at 5pm from May to September).

No1 Pump Station is open Saturday and Sunday from 12–4pm and public holidays (except Good Friday and Christmas Day). 

Call the National Trust of Western Australia on (08) 9321 6088 for further information or to make group or school bookings.


  • Picnic areas with free gas barbecues and drinking water 
  • Playground 
  • Toilets (includes disabled facilities)
  • On-site parking


  • From Perth, take Guildford Road or Great Eastern Highway to Midland
  • Follow the Great Eastern Highway for approximately 16km towards Mundaring
  • Turn right into Nichol Street and follow the signs


To contact our Mundaring Weir operations building please call (08) 9495 8822.