CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins83% CONFIDENCEOverall confidence: 83%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
NOAA's[1][3] damage assessment page states 'On March 24, 1989 the oil tanker Exxon Valdez ran aground in Prince William Sound, Alaska, spilling 11 million gallons of oil'; VOA and Wikipedia[4] agree on the date.On 24 March 1989 the Exxon Valdez ran aground on Bligh Reef in Prince William Sound, Alaska, spilling about 11 million gallons of oil in what was then the largest oil spill in US waters.
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