From hidden valleys in the Berkshire Hills to the North Shore, 275 documented highway and railroad covered bridges have been constructed in Massachusetts from the early 19th century onward, a figure that often comes as a surprise to those who traditionally associate these unique structures with northern New England. All but a small handful of these are long gone, lost to modern replacements, fires, wear, and the region s notorious weather, especially the devastating storms of the late 1930s. The bridges came in all shapes and sizes, from diminutive 50-foot spans to multitiered structures of nearly 900 feet that crossed the Merrimack and Connecticut Rivers and were stout enough to support railroads across their roofs.