Flood in Carroll County, New Hampshire

Heavy rain over steep terrain resulted in Eidelweiss Drive road being closed from Big Loop to Thusis Road due to flooding.

On June 11, 2026, a severe flash flood event impacted Carroll County, New Hampshire, devastating numerous roads in the town of Madison and surrounding areas. The event was driven by a slow-moving warm front interacting with an unstable and moist airmass. This setup allowed a cluster of deep convection to train continuously over the region, producing extreme localized rainfall rates that peaked at an estimated 4 inches per hour. Total accumulations reached 5.47 inches near Albany and a public report of 4.45 inches in Madison, qualifying the deluge as a 100-year average recurrence interval (ARI) event. The extreme flooding was heavily exacerbated by saturated antecedent soil conditions left behind by a remarkably wet May, which had already seen double its typical rainfall.