Birdwatching in Vermont, pp. 95-96.

The Ompompanoosuc area is a small, easily walked site that includes the Ompompanoosuc River, Old Bridge Road, the boat launch, Kendal Station Road, and the railroad tracks that parallel Kendal Station Road. It is at the junction of US-5 and VT-132.

A scope is needed for most ducks in the Ompompanoosuc River.  But elsewhere you might get closer in view.
From Jim Block

Notable species over the years at Ompompanoosuc River Flats have included several locally rare shorebirds (e.g., Black-bellied Plover, Stilt Sandpiper, Sanderling, Dunlin, Baird’s Sandpiper, White-rumped Sandpiper), Bonaparte’s Gull, Great and Snowy egrets, Glossy Ibis, and a wide variety of landbirds, including Horned Larks and American Pipits on the exposed flats. Pompy Flats supports the largest stand of cattails in Norwich and has on occasion hosted Virginia Rail and Marsh Wren.

The Ompompanoosuc River Flats, commonly called Pompy Flats, is arguably Windsor County’s premier site to find migrant shorebirds in spring and late summer-autumn, though only on those increasingly rare occasions when water levels are drawn down via releases on the Connecticut River at Wilder Dam. Such releases, which need not be extensive to create exposed muddy flats and bars at this site, take place infrequently and are difficult to reliably predict. Significant forecasted rain events often trigger these releases; notable drawdowns occurred in advance of Tropical Storm Irene in late August of 2011 and Henri in August 2021. Even when covered by water, Pompy Flats can be productive for waterfowl and waders, while the narrow band of uplands can host a good diversity of terrestrial birds. In fact, this site trails only Lake Runnemede and Paradise Park for the all-time number of species (190) recorded in Windsor County on eBird.

Access to Pompy Flats is straightforward and parking is ample. The most convenient vantage point for scanning the flats themselves (whether exposed or covered by water) is from the end of Old Bridge Road, directly across from (west of) Kendall Station Road. One can park either at the road’s dead-end cul-de-sac or in the boat access area. Spotting scopes are highly recommended for scanning the flats and open water, as birds can be several hundred meters distant. Walking along Old Bridge Road itself can be productive for landbirds, both breeding and migrant species. While 80-90% of Pompy Flats can be covered from this road, there is also an area along VT-132 that passes west under the I-91 bridge and can not be seen from Old Bridge Road; this section, including fields to the north of VT-132, can also be worth searching. Parking here is less convenient (and safe), as one must pull off on the narrow shoulder or park directly under the interstate bridge itself. Use caution with passing traffic if birding this section.