Hadlock Loop Carriage Road

Hadlock Loop is a 4.2-mile circuit on Acadia's auto-free carriage roads, following the official sequence 18–13–12–19–18 around Upper and Lower Hadlock ponds. It is a gravel road walk, distinct from the foot-only Hadlock Ponds Trail. Expect a significant climb and descent; allow about two to two and a half hours with stops at the bridges. The commonly quoted 30–40-minute estimate is for a manual bicycle, not a hiker. Start at the southern carriage-road access near intersections 18 and 19.

This is a broad gravel carriage road, shared with bicycles and horse-drawn carriages. Pedestrians must yield to horses, and it is worth staying alert for other traffic on the shared route. The climb and descent are substantial enough that this feels like a rolling walk, not a flat lap beside the ponds. The stretch between intersections 19 and 12 is a sustained climb for cyclists. Route guidance recommends the reverse loop direction for a gentler uphill on a bike.

The route crosses Hadlock Brook Bridge, Hemlock Bridge, and Waterfall Bridge. Hemlock and Waterfall are only about a tenth of a mile apart, so slow down through this stretch. Hemlock crosses a deep, rocky ravine cut by Maple Spring Brook on a long, curved span clad in granite. Waterfall Bridge carries the road over Upper Hadlock Brook above a 40-foot waterfall. Its parapet lookouts face upstream; the older view across the ponds toward the ocean has grown in with trees. For a route-specific photo, frame the arch from the approach or look upstream from the parapet toward the falls.

Hadlock Brook Bridge dates to 1926, and its small masonry arch was modeled after a bridge at Swan Lake in New York's Central Park. Hemlock Bridge was completed in 1924, with a 37-foot Gothic arch rising above the ravine. Waterfall Bridge followed in 1925, built in a curve to fit the surrounding stone. Together they belong to Acadia's 45-mile carriage-road system, built from 1913 to 1940 as a gift from John D. Rockefeller Jr. and his family.

The carriage-road map marks parking and restrooms near the southern access at 18 and 19, plus a seasonal Island Explorer stop. The map was revised in 2019, so check current transit and facility information before relying on those services. No food or drinking-water stop on the route was found. Pets are allowed on Acadia's carriage roads on a leash no longer than six feet. Carriage roads can close during spring mud season to protect the gravel surface; check the current status before setting out.