JASPER, Ind. (WFIE) - City officials say they now know what caused the water at the Riverwalk to turn red.
They say it was caused by a red marker dye.
Officials say a maintenance crew at a local company put the dye in an inlet to check the source of a leak in the basement of their building.
Officials say the dye is environmentally friendly and they confirmed seeing fish swimming fine through the water.