ONE property remains at risk of flooding as the wall of the irrigation dam at Bolzan Quarry continues to disintegrate.

The owner of the 430ML dam first reported problems in the structural integrity of the dam wall at 5pm on Friday night.

It’s understood the breach in the wall may have been caused by prolonged drought drying out the dam’s clay liner, leading to a crack in the wall.

The hole first measured 3.5 metres wide by 1m high, but has since expanded to 5 metres wide.

The dam emptied into a 50ML cofferdam and spilt out into the surrounding paddocks and creeks at the weekend, self-emptying to 75 per cent capacity.

Southern Downs Mayor Tracy Dobie said modelling shows if the dam wall gives way, that home will be the only property at danger of inundation.

“When that resident is allowed home is dependent on the pressure on the wall being removed,” Cr Dobie said.

“It will be a couple of days yet and in the meantime that person has made their own arrangements.”

The Local Disaster Emergency Group stood down Sunday night and council dam inspectors handed control over to the State Department of Natural Resources, Mines and Energy.

“Our involvement with the dam, as a council, has ended,” Cr Dobie said.

“Council will keep the road closed signs in place because water is still running over those roads and that will continue if the dam wall does break away further.”

Engineers will construct an additional channel near the southern border of the dam this week, which is expected to take more water out of the dam, into Yankee Gully, and onward into Dalrymple Creek.

“That will keep the water level high across road crossings,” Cr Dobie said.

“And if the wall does break and water comes down, those roads will be flooded.”

Road closures listed at 2pm Monday

The following roads are CLOSED:

Condamine River Road – Killarney Closed

Backhouse Road – Closed

Junabee Road – Closed at Eastern End

Hermitage – Emuvale Road – Closed at Eastern End

Emu Creek Road - Closed

Strudwicks Road – Closed at Southern End

Kemps Road – Closed

Upper Freestone School Rd – Closed

Whites Road - Closed

South Branch Road – Maryvale – Closed

Kadows Road – Closed

Wheatvale Plains Road – Closed

Dwans Lane - Closed

Kirklands Road – Closed

Glengallan Road – Willowvale – Closed

Clintonvale – Goomburra Road – Closed

Doyles Road – Clintonvale – Closed

Diggles Road – Closed

Willetts Road – Closed

Cheese Factory Road – Closed

Mullins Road – Talgai – Closed

Springs Road – Greymare – Closed

Fogarty’s Crossing Road – Closed

Park Road – Closed

Victoria St at Cox’s crossing – Closed

School of Arts Road – Closed

Dalrymple Creek Road - Closed

Hendon - Victoria Hill Road - Closed

Mullins Road

Victoria Hills Road

Hanson’s Road

Dalrymple Creek Road

Cheese Factory Road

For more information about road closures visit sdrc.qld.gov.au