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Otago University Students' Association marketing and communications co-ordinator Alasdair Johnston said between 3000 and 3500 had attended the event, which resulted in fewer arrests and paramedic treatment than last year's party.
''We are really happy with it ... and it was awesome to see everyone having a great time,'' he said.
- Slideshow: Hyde St keg party
Dunedin Clutha Waitaki relieving area commander Inspector Jason Guthrie said the crowd was good-natured and the party mostly trouble-free.
Ten people were arrested for minor behavioural offending during the day.
''The atmosphere ... has been generally good with only a minority of people creating issues for themselves and others,'' Insp Guthrie said.
He praised the planning by agencies involved, and in particular the OUSA, which had taken the event ''to another level'', he said.
It had created ''what appears to be a safer and more enjoyable event''.
A spokesman for Dunedin Hospital said there were 20 presentations to the emergency department related to the party.
''It's fairly low, about 15% of all presentations for the day, and it didn't have a big operational impact on ED,'' he said.
Of the 20, nine were treated for the effects of alcohol or other substances.
St John Otago territory manager Doug Third said 45 people were treated for injuries at the party with seven taken to hospital, down by 15 on the 60 people treated last year.
''This year we built on the success of last year with all the extra safety things that we put into place,'' he said.
He was ''very pleased'' with the ''multi-agency approach to making it a safer event'' and that the event was a success, he said.
Dunedin Fire Service assistant area commander Phil Marsh said a fire command unit and two staff attended the party.
''We've aligned with the lead agency, which is the police, this year and we haven't had to do too much, to be honest ... which is great from our point of view.''
University of Otago vice-chancellor Prof Harlene Hayne said she spent most of the day at the party and she thought it was ''incredibly well organised''.
Mr Johnston said the OUSA was ''stoked'' with the behaviour of this year's party-goers.
He hoped its success would secure the party for the next 20 years.