Up to 2000 people are expected to take part and there are a range of spot prizes available for fancy dress, corporate, schools and general and cutest pet.
The entry fee is $5 for adults and $2 for children and these can be bought at the Wanganui Chronicle office, Property Brokers and Sport Whanganui.
All proceeds from entry fees will go to this year's charity, Birthright Wanganui.
Birthright Wanganui has four staff and 154 Whanganui families on its books, helping 364 children.
It is a not-for-profit organisation and financial help such as Round the Bridges keeps it ticking over.
The start and finish is at Kowhai Park with registration open at 8am and race start times staggered after that. Prizegiving is at 11am.
-If the weather conditions are bad, any decision to cancel will be announced on The Hits 89.6 radio station at 8am on Sunday.