Multiple police crews have descended on bushland in Brisbane’s north after a 20-year-old man went missing shortly before midday on Tuesday.

Officers said the young man, Colin Morgan, was last seen about 11am on Tuesday at Enoggera Reservoir, near the Walkabout Creek Discovery Centre.

They said Morgan’s family was concerned about his welfare because of his medical condition. Morgan had not contacted family and friends since he was reported missing.

Colin Morgan, 20, was last seen on Tuesday wearing a black shirt and red shoes.Credit: Queensland Police

About 4pm, residents said police crews – including vehicles with lights and sirens – arrived in Enoggera Reservoir, with a spokesperson for Queensland Police confirming numerous units had been dispatched to the region.

However, officers suspected Morgan might have left the immediate area.

The 20-year-old was described as Aboriginal with a large build and brown hair, and was wearing a black shirt and red shoes when he was last seen.

Officers asked Morgan, or anyone who might have seen him or know his whereabouts, to come forward.

Get alerts on significant breaking news as it happens. Sign up for our Breaking News Alert****.