Seven people were arrested and nearly 100 needed medical attention after country singer Kenny Chesney performed in Pittsburgh last night on his Spread the Love tour.

The concert at Heinz Field drew about 40,000 people on Saturday night, 37 of whom were taken to the hospital mostly due to dehydration and intoxication, according to the city's public safety director, the Post Gazette reported.

From midnight to 6am on Sunday, the city's sanitation department cleared a shocking 48 tons of garbage left behind from the tailgate party, TribLive reported.

Despite all this, authorities said they were pleased with the improved circumstances compared to past events, including a 2013 Chesney concert where 73 were arrested in the city.

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Seven people were arrested and nearly 100 needed medical attention after country singer Kenny Chesney (pictured in April) performed in Pittsburgh last night on his Spread the Love tour

The city's sanitation department cleared a shocking 48 tons of garbage left behind from the tailgate party

The concert at Heinz Field drew about 40,000 people on Saturday night, 37 of whom were taken to the hospital mostly due to dehydration and intoxication. Seven arrests were also made

Public safety spokeswoman Sonya Toler said seven arrests were made on charges including trespassing, ticket robbery, simple assault and public intoxication.

Several dozen people were also cited for underage drinking and one officer injured his thumb while breaking up a fight.

During a press conference on Sunday morning, Wendell Hissrich, the city's public safety director, bumped up the numbers from an initial report to 99 people who needed emergency medical services.

Among those, 37 were taken to a hospital, although no one was in serious condition, the Post Gazette reported.

While photographs of a trash-strewn parking lot outside the stadium circulated online, chief operations officer Guy Costa said he was 'very pleased'.

'These things have made major, major improvements' Costa said, according to the local news website.

A 2013 Chesney concert in Pittsburgh gained national attention after 73 people were arrested and patrons left behind more than 30 tons of trash.

While photographs of a trash-strewn parking lot outside the stadium circulated online, chief operations officer Guy Costa said he was 'very pleased' by the improvement after a 2013 Chesney concert led to 73 arrests

Miranda Lambert (pictured), Sam Hunt and Old Dominion also took the stage on Chesney's Spread the Love tour

The city has since offered free trash bags at events, and visibly drunk attendees have been barred from Heinz Field in an attempt to crack down on unruly concert-goers.

In comparison, last night's event was a success, and police chief Cameron McLay said the number of arrests was 'very low'.

The seven arrests were all related to 'alcohol misbehavior' and an additional four citations were issued along with one arrest by summons.