Green River Reservoir State Park, Vermont state park in Hyde Park, US.

Green River Reservoir State Park is a large nature preserve in Vermont's mountains, centered around an expansive reservoir. The water is surrounded by dense forests and offers undeveloped shoreline stretching for many miles.

The reservoir was created by a dam on the Green River, and the surrounding land later passed from a local water utility to the State of Vermont, which established the park. The reservoir and its shoreline were kept largely undeveloped, with only low-impact recreation permitted. The park covers 5,500 acres, including the 653-acre reservoir.

The reservoir was created by damming the Green River, and the park takes its name from that river. Day-use picnic sites are reachable only by boat, so eating at one is part of the outing. Motors are capped at 5 mph and must be electric; canoes and kayaks are the usual craft.

Campsites are scattered around the reservoir and reachable only by boat from the launch area, requiring a short journey across the water. Visitors should know that only human-powered boats and electric motors are allowed to keep the place quiet.

All 28 campsites around the reservoir are remote and reachable only by boat, and day-use picnic sites are likewise boat-access only. Parking at the launch is limited, and boats are capped at electric motors of 5 mph or human power.