THE Argyle Rd bridge was closed from 1.30pm until further notice. Water was across the road before the bridge, signalling imminent water over the bridge.
Access to Argyle will require taking Hurst Road from Boyanup.
The school bus driver for this route has been advised.
The Argyle and Bendall Road Bridges are likely to be closed until Saturday morning.
The next inspection is scheduled for 5pm today, Friday August 29. A final inspection will be undertaken at 10pm this evening.
Plastic debris is beginning to cluster at the Bendall Road Bridge.
Argyle Bridge closed
As at 3.27pm the Bureau of Meterorology advised a slow moving cold front is continuing to move through South West parts of the state.
The front is likely to produce heavy rainfall that may cause flash flooding. Rainfall from this front is expected to be heavier than normal.
Moderate to heavy rainfall will redevelop during the afternoon and evening. The cold front will then weaken with rainfall easing from late Friday evening over the South West.
Isolated thunderstorms are still possible, however damaging winds are no longer expected.
UPDATE 12.20pm: The Bendall Road bridge has been closed to traffic after it was submerged by the rising Preston River.
Argyle bridge remains open and is being monitored, although closure is likely.
Hazard signs have been installed on Upper Capel Rd about 5km south of Donnybrook town due to water over the road.
Collins and Marmion Streets have been reopened.
Sandhills Road remains closed.
A vehicle has been submerged in the flooding of the Thomson Brook near Brookhampton Hall.
The Bendall Road bridge is closed to traffic
As at 11.11am the Preston River at Donnybrook is above the minor flood level of 3.5m and rising.
The Preston River at Boyanup Bridge is at 1.5 metres and rising.
Rainfall over the Preston River catchment has been concentrated along the southern portion with totals of 60 to 100mm being recorded during the 24 hours to 9am Friday. The rain is expected to continue until late Friday afternoon with further falls of 30 to 50mm possible.
The Preston River at Donnybrook is expected to approach the moderate flood level 4.5m late Friday afternoon. The Preston River at Boyanup Bridge is expected to approach the minor flood level 3m late Friday afternoon.
HEAVY rainfall over the past 24 hours has resulted in flooding in a number of areas in and around the Donnybrook-Balingup Shire.
There is a lot of surface water on the South Western Highway, so drivers should proceed with caution.
Water is running across Brookhampton Road in several places. Sandhills Roads has been closed near Wade Road.
Sandhills Road is closed to traffic
The Thomson Brook at Woodperry has risen sharply and is above the Moderate Flood Level (2.5m).
At about 8.30am the Preston River was at 2.63 metres and rising. The river is expected to continue rising due to inflows from the Thomson River and approach the minor flood level (3.5m) late Friday morning.
The Preston River at Boyanup Bridge is at 0.95 metres and rising. Further stream rises to continue during Friday to around the minor flood level (3.0m) possible.
Rainfall over the Preston Catchment has been concentrated along the southern portion with totals of 60 to 100mm being recorded since 9am Thursday. The rain is expected to continue until midday Friday with further falls of 20 to 30mm possible.
The Department of Fire and Emergency Services (DFES) advises people to prepare to relocate equipment and livestock early so they are not caught in floodwaters.
People are also advised to fill their vehicle's fuel tank.
To prevent flooding inside your home, create your own sandbags by using pillow cases filled with sand and place them around doorways.
Watch for changes in water levels so you are ready if you need to relocate.
Never walk, swim or play in floodwaters, as they are dangerous.
With water moving quickly people need to stay out of the Preston River, this includes no swimming or kayaking.
If you are a traveller do not park or camp adjacent to rivers.
If driving, floodways and river levels may rise rapidly so be careful at crossings.
Obey road closure signs and do not drive into water of unknown depth and current.
Take care on gravel and unsealed roads as they may be slippery and muddy, and you could get bogged.
Carry extra food and water when travelling in case of long delays at crossings.