The academy’s new, permanent home is being built on land close to Middlesbrough College and the town’s railway station.
Work started last summer with construction led by Bowmer + Kirkland on behalf of the Department for Education.
Students are expected to move to the new site next year.
Young people from years 7, 8 and 9 joined Principal Melissa Brant-Smith for a look around the site as excitement builds for the move.
They were joined by Middlesbrough Mayor Chris Cooke and Deputy Mayor Philippa Storey.
Mayor Cooke said: “This new academy is all about the dreams and future aspirations of the young people will come and learn here.
“It’s great that some of them have been able to come along and take a look around.”
Cllr Storey, who is also Executive member for Education, said: “We want the very best environments for our children and young people and the progress on site is really exciting.”
Melissa Brant-Smith said: "From our very first day in temporary classrooms, the spirit of Riverside has been unstoppable. To see that spirit now reflected in the scale and ambition of this new build is incredibly moving.
“It is genuinely electrifying to stand at the perimeter and see our vision finally taking physical form; there is a palpable sense of excitement in watching the skyline change as these walls rise.
“This isn't just a school; it’s a landmark for our community and a testament to the grit and brilliance of our students who deserve nothing less than the best."
Helen Bedford, social value manager at Bowmer + Kirkland, said: “It was great to welcome the children to their new school to see how it is progressing.
“We will continue to support visits and the school throughout the project with activities such as a time capsule burial, design challenges, regular updates of site progress through their student voice and promoting careers in construction.”
The construction of the new school is one of a number of regeneration projects heading towards conclusion in the town.
The new Southlands Centre, which will become the home of MFC Foundation, is due to open this summer. And the Nunthorpe Community Centre is also progressing well.
