Wednesday was a busy day for Tom Waller, founder of the website How Many Days Since Montague Street Bridge Has Been Hit.

The notoriously low-clearance South Melbourne bridge was hit twice in five hours.

Loading

In the first incident, around 11:00am, a skip was knocked off a truck onto the road when it failed to clear the three-metre-high bridge, Mr Waller said.

Mr Waller was quick to update his website, which documents each incident involving the bridge, as soon as he was notified of the accident.

"There was two or three blokes that emailed me within minutes of it happening," he told 774 ABC Melbourne's Rafael Epstein.

Loading

He said he was not expecting to have to update the website a second time that day, but another truck hit the bridge around 3:00pm.

The bridge, which has also inspired parody Twitter and Facebook accounts, has been hit at least 100 times since 2009.

Caller saw bridge hit in 1929

The first accident recorded on Mr Waller's website was a tour bus that hit the bridge in February.

The bus driver and 14 passengers were rescued from the wreckage, 11 of whom were taken to hospital.

All 15 occupants of the Gold Bus survived the February crash. ( Twitter: Metropolitan Fire Brigade )

The day after the bus crash, Patrick from Epping rang 774 ABC Melbourne to say he saw another vehicle hit the bridge — 87 years ago.

"I was there in 1929 ... and a truck got stuck under that bridge," he told presenter Jon Faine.

Patrick, then seven years old, suggested a course of action that freed the truck.

"I said to them 'why don't you let his tyres down'," he recalled, adding that inflatable tyres were only new at the time.

An early photo of the Montague Street Bridge. ( Supplied: Public Record Office Victoria )

Bridge regularly hit in the 1970s, caller says

Caller Tony in Blackburn said he used to manage the South Melbourne branch of a vehicle hire business in the 1970s.

He said the bridge was a problem then, with five or six trucks hired from his branch hitting the bridge each year.

"How long does it take to get something done?" Tony said.

VicRoads announced in February that it would install new overhead warnings near the bridge to help prevent further crashes.

Vince Punaro from VicRoads said the work would be completed by the end of May.

At the time of writing, Mr Waller's website showed one day had passed since the bridge was last hit.