From Halopedia, the Halo wiki
Dry Creek Road was a road through the city of Gladsheim on Harvest.
In 2525, The Covenant cruiser Rapid Conversion hovered over the road while its Jiralhanae crew searched for "Oracles" on the planet's surface. In response, Staff Sergeant Avery Johnson asked Harvest's AI, Mack, to block off the road to civilians.
Along with the rest of Harvest, it was glassed by the Covenant during the First Battle of Harvest, the first official encounter between the UNSC and the Covenant.