While the world number three was the main attraction on the final day in front a strong crowd of fans up and down the course, there were several other results that got spectators into a frenzy on a day perfectly suited for racing on what was described as a world class track.
Dannielle Beecroft was one who didn't hold back in her race run in the elite women.
Beecroft, who only won one round of the series in her comeback year in 2016 after injury, was last down the course and dropped a winning time of 4min 19:78sec, more than seven seconds ahead of Tegan Molloy (NSW) and local veteran Sarah Booth (NSW).
"Yesterday I was too cautious hanging on the breaks to much and thinking about crashing but today I let it go and it paid off," Beecroft said.
"I certainly didn't think I'd be getting that time for sure."
While time certainly wasn't on Brosnan's mind, it became the talking point of the strong supporter base at the finishing bowl as the South Australian rider clocked a 3min 30:19sec
"I really didn't think I could go faster but pretty stoked with that."
Jake Newell, who had the local cheer squad, hardly had time to get into the hot-seat after his run of 3min 36:00sec, before Brosnan crossed more than six seconds quicker to take the top of the podium ahead of Newell and Jackson Frew (ACT) who was competing in his first elite race.
"I was expecting the rocks to be a bit drier so was a little bit wild in there but was rolling down and having fun and there were a lot of people on the track and everyone cheering on," Brosnan admitted.
It was a disappointing end for reigning national series holder Graeme Mudd who was forced out through illness Sunday morning.
But the crowd still had plenty of locals to cheer for when Brunkerville local Patrick Butler lit it up in the junior men, as he laid down the second fastest run overall with a 3:34:16 on the track which is 14 minutes from his home.
Butler took the lead in the series ahead of Joshua Clark and Harry Parsons.
Ellie Smith took out the junior women ahead of Sally Potter while in the U17 Kye A'hern broke the 4-minute mark to win.