A fire alarm about 9:15 a.m. Tuesday led to the evacuation of the Maid of the Mist plaza on the Canadian side of the gorge.
After members of the Niagara Falls Fire Department and Niagara Parks Police Service arrived, it was determined the alarm was tripped by dust in the building's duct work.
Emergency officials had trouble resetting the fire alarm for normal operations and shut down the building — and its elevator to the top of the gorge. While staff were allowed back inside the building, customers were allowed to walk up the access road from the Maid docks or wait for a shuttle.
Firefighters stood by due to the day's heat and weather conditions and Niagara Parks Commission culinary staff provided water to people walking up the access road to street level.
Normal elevator operations were restored about 10:45 p.m. There were no reported injuries to patrons or staff.