The Gowler sisters joined Ella Greenslade and Beth Ross to win the premier women's coxless four, while Kerri Gowler and Ross joined forces to finish third in the premier coxless pair. Harris and Robbie Manson claimed the men's premier double scull and Harris then finished fifth in the premier single scull won by Manson.
Nugent-O'Leary, hunting down a spot in the Olympic squad, finished fifth in both the women's premier double scull with Sophie Mackenzie and in the premier single scull.
READ MORE:
• Premium - Time to highlight the achievements and reflect on the sadness of 2019 Whanganui rowing
• Whanganui rowing volunteer Jemal Weston receives Kiwibank Local Hero Award
• Union Boat Club pontoon removed from Whanganui River for repairs
• Rowing column: Whanganui season underway with 10km race
Whanganui was low on numbers at this year's nationals where Whanganui Collegiate rowers Blake Hogan and Leo Hanna finished third in the men's U19 double scull A Final.
Other AWRC competitors Luke Watts, Tom Monaghan and brothers Guy and Jonty Thomson finished third in the men's premier coxless quad and fourth in the senior coxless quad.
Meanwhile, Collegiate completely dominated the Blinkhorne and Carroll Whanganui Club and School Championships three days earlier than the nationals.
Collegiate rowers won the Wanganui Plumbing Challenge Trophy for the most overall points. The school claimed 18 gold medals.
Whanganui High School rowers competed in 26 A Finals, winning nine, finishing second seven times and three thirds, while Union won five A Finals, finished second four times and once third.
Cullinane College made two A Finals for a second and a fourth, while AWRC won four gold, one silver and one bronze.