It was spotted Saturday afternoon at Etiwanda Creek Park during a Pop Warner game.
Eyewitness News viewer Shante Hall said the swirling winds tossed up tents and belongings, and forced people to cover their eyes.
"My purse fell over and I lost my $40. It flew out of my purse and I don't know what happened to it," one woman said.
The National Weather Service later confirmed that it was a dust devil. The agency says there have been several such sightings in the Inland Empire recently and that the conditions on Saturday were just right for one to form.