A potential breach at Gardy’s Millpond Dam has shut down Route 617 near the Northumberland–Westmoreland county line. Crews found erosion near an emergency spillway late Saturday, prompting an emergency declaration Sunday. Stabilization efforts are underway, including sandbags to prevent further damage. The dam is classified as low hazard, but heavy rain is expected. The road and boat ramp are closed with no timeline for reopening. Drivers are being detoured to Route 202.