In 2010, US scientists tracked dye 41.2 miles in Montana’s Missouri River; a reservoir held it 8.2 hours

Scientists conducted a dye-tracing experiment on Montana's Missouri River. This study examined how substances move through the waterway over forty miles. The dye traveled at different speeds through various river sections and reservoirs. Researchers measured how the dye plume spread along the river's direction. This data aids in predicting contaminant movement and planning for accidental spills.