Emergency services are performing a "high-angle" rescue of a woman stuck on top of a CFA tower in Mount Macedon, 64 kilometres north-west of Melbourne, on Sunday evening.
Ambulance Victoria spokesman John Mullen said the women, who was in her 30s, had suffered an injury to her leg.
"There is a high-angle rescue happening at Cameron Drive, Mount Macedon," Mr Mullen said.
"The female has a serious laceration to her leg.
"She at the top of a ... CFA tower."
Mr Mullen said paramedics had treated the woman, and the SES were attempting to bring her down.
"The only way you can get up and down the tower is by a ladder and because of the injury to her leg, she obviously can't use it," he said.
"The SES are in the process of getting her down."