A covered bridge is a timber-truss bridge complete with a roof, decking, and siding, which in most cases creates an almost complete enclosure. The purpose of the covering is to protect the wooden structural members from the the effects of rain and sun, effectively increasing the lifespan of the bridge from about twenty years when not covered to about 100 years when it is covered.

In the United States, the survival rate of covered bridges is about ten percent because only about 1 out of 10 survived into the 21st century. The relatively small number of surviving bridges is due in part to deliberate replacement, neglect or the high cost of restoration.

The state of New Hampshire has 54 historic covered bridges.

Ashuelot, Ashuelot, 1864, 42.776389, -72.423889

Bath, Bath, 1832, 44.166944, -71.967222

Bement, Bradford, 1854, 43.264167, -71.953611

Blair, Campton, 1869, 43.81, -71.665278

Blow-Me-Down, 1877, 43.517222, -72.374444

Bog, Andover, 1887, 43.430278, -71.869722

Bump, Campton, 1972, 43.8144714, -71.6218953

Carleton, Swanzey, 1869, 42.854722, -72.274444

Columbia, Columbis, 1911, 44.853, -71.551

Corbin, Newport, 1845, 43.391111, -72.195417

Cornish-Windsor, Cornish, 1866, 43.474, -72.384

Dalton, Warner, 1853, 43.276667, -71.811944

Dingleton Hill, 1882, 43.464167, -72.369167

Durgin, Sandwich, 1869, 43.855833, -71.364722

Edgell, Lyme, 1885, 43.8676636, -72.1649242

Flume, Lincoln, 1871, 44.0993022, -71.6772034

Hancock-Greenfield, Hancock and Greenfield, 1937, 42.956667, -71.934722

Happy Corner, Pittsburg, 1850, 45.0844066, -71.3132874

Honeymoon, Jackson, 1876, 44.141667, -71.186389

Keniston, Andover, 1882, 43.435, -71.836667

Mechanic Street, Lancaster, 1862, 44.4869313, -71.5644854

Meriden, Plainsfield, 1880, 43.5533131, -72.2656903

Mount Orne, Lancaster, 1911, 44.4599608, -71.6522449

Pittsburg-Clarksville (Bacon Bridge), 1876, 45.054444, -71.406944

Rowells, Swanzey, 1853, 43.1924416, -71.7485136

Saco River, Conway, 1890, 43.9828909, -71.1173929

Sawyers Crossing, Swanzey, 1859, 42.886111, -72.286667

Slate, Swanzey, 2001, 42.847222, -72.340278 (rebuilt-see destroyed)

Smith Millennium, Plymouth, 2001, 43.7752173, -71.7387174 (destroyed fire 1993)

Squam River, Ashland, 1990,

Stowell Road, Merrimack, 1990,

Stark, Stark, 1857, 44.600833, -71.408333

Swiftwater, Bath, 1849, 44.134167, -71.951389

Waterloo, Warner, 1840, 43.287778, -71.8575

Bartlett, Bartlett, 1851, 44.0947784, -71.2033418, Gift Shop

Bath-Haverhill, 1827, 44.154722, -72.036389

Blacksmith Shop, Cornish, 1882, 43.463056, -72.353333

Brundage, Grafton, 1957, 43.6068286, -71.9387137

Chester, Chester, 2011, 42.9816577, -71.2161734

Cold River, Langdon, 1869, 43.169785, -72.345645

Coombs, Winchester, 1837, 42.837778, -72.360833

Groveton, Groveton, 1852, 44.5956920, -71.5107842, (also ATV)

Henniker, 1972, New England College, 43.1773156, -71.8239504

HoodKroft (Country Club private), Derry, 1980, 42.8881419, -71.3135629

Jack O′Lantern (Golf Club private), Woodstock, 1987, 43.9494520, -71.6769060

Little Red, (Candia Woods Golf private), 1961, 43.0448739, -71.3149356

Melendy Pond, Hudson, 1982, 42.7612381, -71.4292216

Nepalese (Mossy Glen Falls), Randolph, 1968, 44.3360815, -71.2963645

Nissitissit, Brookline, 1978, 42.7354211, -71.6707579

Pier, Newport, 1907, 43.361944, -72.241944

Prentiss, Langdon, 1874, 43.153056, -72.393889

River Road, Pittsburg, 1858, 45.0722967, -71.3059228

Riverwalk, Littleton, 2004, 44.3050813, -71.7732194

Royal Crest (Royal Crest Apartments private), Nashua

Sentinel Pine, Lincoln, 1939, 44.1042655, -71.6780355

Stoney Morrell, Kennet HS Campus, Conway, 1999,

Swift River, Conway, 1869, 43.983611, -71.1175

Tannery Hill, Peterborough, 1965, 43.5498876, -71.4052257

Teixera Park, Peterborough, 1965,

Turkey Jim′s, Campton, 1883,

Wentworth (golf club private), 1991,

West Swanzey, Swanzey, 1832, 42.871667, -72.328333

White Mountain NF, Albany, 1858, 44.0057517, -71.2410939

Whittier, Ossippee, 1870, 43.822222, -71.211944

Yankee Barn, Eastman Community Assoc. Private, 1982, 43.358889, -72.259167

Clarks, North Woodstock, 1904, 44.0513581, -71.6879185

Contoocook, Contoocook, 1849, 43.223056, -71.713889

Goffstown, 1901, Goffstown, Destroyed Arson 1976, 43.018172, -71.599145

Sulphite Upside-Down, Franklin, 1896, 43.445, -71.635278

Wright&prim;s, Newport, 1906, 43.358889, -72.259167, (Foot traffic)

Chocorua Ski and Beach, Tarnworth, 1992, 43.8549374, -71.2039467

Friendship, Wentworth, 1962,

Packard Hill, Lebanon, 1991, 43.63859, -72.22239

Androscoggin River, Errol

Bedell, Haverhill, Destroyed 1979, 44.045278, -72.074167

Clear Stream, Errol

County Farm, Dover, 1875, 43.220556, -70.943889

Fields Seaverns, Merrimack

New Henniker, West Hopkinton, 1863, Destroyed 1936, 43.1817, -71.75188

Runnels, Hollis

Slate, Swanzey, 1862, Burned 1993 (rebuild 2001)

Smith, Plymouth, 1850, Burned 1993, (rebuild 2001)

Turkey Hill, Merrimack