More than 200 markers sponsored by the American Society of Civil Engineers recognizing historically significant local, national, and international civil engineering projects, structures, and sites.
On U.S. 43 at milepost 19, 0.1 miles south of Lofton Road, on the right when traveling north.
Marks 1st Southern Boundary of the United States and the Mississippi Territory created in 1798
-----900 feet East-----
Stone marked 31° North Latitude separating the U.S. & Spanish Florida.
This line of demarcation ran from the . . . — — Map (db m104073) HM
On 1st Avenue at Cushman Street, on the left when traveling east on 1st Avenue.
Completed in 1942
Constructed in just 8 months in 1942, this 2,450 kilometre highway provided an essential transportation link to the northwest of North America during the Second World War, and has since remained a major . . . — — Map (db m257084) HM
On Calhoun Avenue at Indian, on the left when traveling north on Calhoun Avenue.
A sum of $40,000 was authorized under the Public Building Act of 1910 and construction began in 1912. Governor Walter D. Clark held the first open house January 1, 1913.
State of Alaska
Governor Walter J. Hickel
Alaska Centennial . . . — — Map (db m181739) HM
On Alaska Highway (at milepost 1,422) at Richardson Highway, on the left when traveling north on Alaska Highway.
This highway was constructed during World War II as a military supply route for interior Alaska Military and Airfields in 1942. 7 Army regiments and 42 Contractors and Public Roads Administrators working from Delta Junction South and Dawson Creek . . . — — Map (db m59840) HM
Dedicated to the
Engineering Achievements of
Percy Jones, Jr.
1888 –
Chief locating engineer who by sheer genius personally located more miles of Arizona highways than any other person. His college training in mining and geology . . . — — Map (db m37899) HM
Dedicated to the
Engineering Achievements of
Percy Jones, Jr.
1888 –
Chief locating engineer who by sheer genius personally located more miles of Arizona highways than any other person. His college training in mining and geology . . . — — Map (db m37900) HM
On Rim Trail north of Yavapai Point, on the right when traveling west.
Constructed in 1928, the Kaibab Trail Suspension Bridge was the only crossing of the Colorado River in a distance of 754 miles from Moab, Utah to Needles, California. Built in a remove location with incredibly difficult access through rugged . . . — — Map (db m173929) HM
There are three markers on this end of the Navajo Bridge.(Marker on left:)
National Historical Civil
Engineering Landmark
American
Society of
Engineers
1852
Designated by the American Society of Civil Engineers . . . — — Map (db m94887) HM
Colorado River Storage Project
In recognition of the vision of the Colorado River Storage Project Act of 1956 and the significant contributions the act has made to the development of the Upper Colorado River Basin states, this plaque . . . — — Map (db m40350) HM
Near North Horne Avenue 0.4 miles south of East McKellips Road.
Approximately 300 B.C. Prehistoric Indians entered the Salt River Valley. They developed an extensive canal system and raised corn, beans, squash, agave and cotton.
Over 500 miles of Hohokam canal have been recorded in the Salt River . . . — — Map (db m49877) HM
A colorful administrator, he is credited with establishing the basic location of Arizona's billion-dollar Interstate Highway System. He served as State Engineer twice, from 1924 to 1928 and from 1945 to 1951.
He devoted much of his final term to . . . — — Map (db m40780) HM
Chabot Dam, originally called San Leandro Dam, was built by Anthony Chabot who started Contra Coast Water Company in 1868. When artesian wells and Temescal and Sausal Creeks failed to bring Oakland and surrounding cities enough water he decided . . . — — Map (db m71714) HM
Main marker:
California Historic Civil Engineering Landmark.
Alameda Creek Water System, 1888.
San Francisco Section A802, 1975.
Second marker:
Restoration of the Sunol Water Temple.
Started May 27, 1997. . . . — — Map (db m24499) HM
On California Route 211 at Depot Street, on the left when traveling south on California Route 211.
Dedicated on November 16, 1911 and affectionately known as the "Queen of Bridges", it was the longest reinforced concrete arch structure in the world at the time of its construction. The bridge was designed by John B. Leonard, Civil Engineer, . . . — — Map (db m71907) HM
Near Interstate 5, 0.8 miles north of Frazier Mountain Park Road.
The California Outstanding Civil Engineering Achievement - 1980, Interstate Highway 5, designated by the California State Council, ASCE. — — Map (db m192222) HM
On Woodford-Tehachapi Road, 3.2 mi E of Keene exit, on the left when traveling east.
In front of you is the world famous Tehachapi Loop which is about halfway upgrade to the Tehachapi Pass. This steep line averages 2.2% in gradient in its 28 miles of length. This feat of civil engineering genius was crowning achievement of civil . . . — — Map (db m134431) HM
In front of you in the hills, high above freeway Interstate 5, is a portion of the historic 1915 two-lane “Ridge Route”. The power lines follow it.
The original Ridge Route was constructed in 1914-1915 by pick, shovel and mule drawn Fresno . . . — — Map (db m152085) HM
The first high-rise in Southern California, at 452 feet, and until 1964 the tallest building in Los Angeles, originally designed only for gravity and wind loads, it has survived the earthquakes of 1933, 1971, 1987, and 1994. The engineer of . . . — — Map (db m235255) HM
Near Sepulveda Boulevard 0.5 miles north of Roxford Street.
The California Outstanding
Civil Engineering Achievement - 1988,
Los Angeles Aqueduct Filtration Plant,
designated by
Los Angeles Section, ASCE,
California State Council, ASCE. — — Map (db m294297) HM
On Foothill Boulevard 0.1 miles north of Balboa Boulevard, on the right when traveling north.
This is the terminus of the Los Angeles-Owens River Aqueduct, which brings water 338 miles from the eastern slopes of the Sierra Nevada to the City of Los Angeles. Begun in 1905, the great aqueduct was completed November 5, 1913. The Mono Craters . . . — — Map (db m164815) HM
On Foothill Boulevard 0.1 miles west of Balboa Boulevard, on the right when traveling west.
On November 5, 1913, 40,000 people gathered here to witness the dedication of the Los Angeles - Owens River Aqueduct. The terminus of a 233-mile long engineering marvel, the Cascades were the site of William Mulholland‘s famous speech: “There it is, . . . — — Map (db m165409) HM
On Colorado Boulevard 0.1 miles west of Orange Grove Boulevard, on the left when traveling west.
Waddell & Harrington of Kansas City, Missouri, designed the
Colorado Street Bridge in 1912. J.D.Mercereau Construction of Los
Angeles was the contractor. Dedicated and opened to traffic on
December 13, 1913. Designated as a Historic Civil . . . — — Map (db m161949) HM
On Torrance Boulevard at Bow Avenue, on the right when traveling east on Torrance Boulevard.
Constructed in 1913, this bridge was a part of the Pacific Electric Railway system which was designated as a Local Historic Civil Engineering Landmark by the American Society of Civil Engineers, Los Angeles section, in 1973. Although the bridge no . . . — — Map (db m140110) HM
Near U.S. 101, on the right when traveling north. Reported damaged.
The Golden Gate Bridge is a structure of striking form and elegance. Built in 1937, it remains an indispensable link in the Bay Area's transportation network and a historical monument of civil engineering and construction. The bridge was named for . . . — — Map (db m102433) HM
On Tioga Pass Road (State Highway 120), on the right when traveling east.
Tioga Pass at 9945 feet is the highest automobile pass in California. The road to the pass was constructed in two parts. The first part was a wagon road, 56 miles long, going from Crane Flat on the west side to a silver mine on the east slope of the . . . — — Map (db m49970) HM
Near Pleasant Valley Road 7.5 miles north of Route 20, on the left when traveling north.
Built in 1862 by David J. Wood with lumber from his mill in Sierra County, the covered bridge was part of the Virginia Turnpike Company toll road that served the northern mines and the Nevada Comstock Lode. The associated ranch and resources for . . . — — Map (db m78339) HM
On Ortega Highway at Camino Capistrano, on the left when traveling east on Ortega Highway.
Mission San Juan Capistrano was founded in 1776 by Saint
Serra. As the seventh of the 21 California missions, and the
only mission in Orange County, it hosts the State's most
historically significant chapel, Serra Chapel (1782) and the
ruins of . . . — — Map (db m148351) HM
On Park Avenue at Victory Road, on the right when traveling south on Park Avenue.
History of the Air Base from 1942 to 1949
In March 1942, the Navy Bureau of Yards and Docks contracted with Holmes & Narver Consulting Engineers of Los Angeles to design and engineer an LTA base that would accommodate the design for . . . — — Map (db m190132) HM
Water from the Santa Ana River was largely responsible for the transformation of this arid valley into productive agricultural land. Irrigation companies in Orange County were in operation as early as the 1860s. The two largest were the Santa Ana . . . — — Map (db m59529) HM
On I street at Front Street, on the right when traveling west on I street.
Historic Civil Engineering Landmark
Sacramento Water Works
Completed in April 1854, the City of Sacramento’s water works was the first municipal, city-owned water system west of the Mississippi River. Before the municipal system was built, the . . . — — Map (db m224046) HM
On Mill Creek Road (California Route 38) 1 mile east of Bryant Street, on the right when traveling east.
In memory of
Henry Harbinson Sinclair,
1858-1914.
A testimonial to his high and useful
service as a pioneer
in the establishment
and development of the
hydro electric industry in California. — — Map (db m155025) HM
On El Prado east of Balboa Drive, on the right when traveling east.
When the 1915 Panama-California Exposition was related to an upper mesa of Balboa Park from the original proposed site near downtown San Diego, a bridge over Cabrillo Canyon was required. Director of Works Frank P. Allen, Jr. (1831-1943) . . . — — Map (db m209220) HM
Near Mason Street at Washington Street, on the left when traveling north.
California Historic Civil Engineering Landmark.
San Francisco Cable Car System - 1873.
San Francisco Section ASCE - 1976.
National Historic Mechanical Engineering Landmark.
Ferries & Cliff House Cable Railway - 1887. . . . — — Map (db m259555) HM
Near Lincoln Boulevard west of Chrissy Field Avenue.
"The Golden Gate!" Army explorer John Charles Fremont named the entrance to San Francisco Bay in 1846. His Majesty Emperor Joshua Abraham Norton decreed in 1869 a bridge be built “…across the Golden Gate to Sausalito Ridge.” Work finally began 64 . . . — — Map (db m31685) HM
On Skyline Boulevard west of Crystal Springs Road when traveling south.
Crystal Springs Dam continues to provide the critical link in the delivery of water to the people of the San Francisco Peninsula. Centennial Observation held on this spot by joint resolution of the
San Mateo County Board of Supervisors
Tom . . . — — Map (db m18447) HM
This brick lighthouse was built to incorporate a French first order Fresnel lens. Although no longer used, the lens is still operable in the lantern room. Previously the lens had been installed at Cape Hatteras, North Carolina. It first flashed over . . . — — Map (db m2541) HM
On Stagecoach Road near San Marcos Pass Road ( Route 154).
The Cold Spring Arch Bridge, built by the California
Department of Transportation, at the time of construction was
one of the longest steel arch bridges built in the United States.
It was also one of the first major arch structures to use . . . — — Map (db m244974) HM
Near Los Olivos Street north of Alameda Padre Serra, on the right when traveling north.
The original water supply for the Santa Barbara Mission is an outstanding
example of an early water system in Southern California. It was constructed
by the Native Americans under the direction of the Franciscan Padres.
Constructed in . . . — — Map (db m147954) HM
On Main Avenue at 5th Street, on the right when traveling south on Main Avenue.
has been designated a
Registered National
Historic Landmark
under the provisions of the
Historic Sites Act of August 21, 1935
This site possesses exceptional value
in commemorating or illustrating
the history of the United . . . — — Map (db m160243) HM
Near State Highway 10 1.3 miles south of Wetherill Mesa Road.
Imagine this mesa top in A.D. 1150 with fields of corn, beans, and squash; supplemented with wild plants such as amaranth, tubers, and sunflowers. Children could be seen watering corn with clay water jars (ollas), and young men could be seen cutting . . . — — Map (db m71901) HM
Near Tamiami Trail East (U.S. 41) south of San Marco Road (County Route 92), on the right when traveling south.
This walking dredge, built by the Bay City (Michigan) Dredge Works, is the earliest known survivor of its type. Designed for use over swampy terrain where wheeled or tracked vehicles would bog down the machine’s weight was distributed over shoes. To . . . — — Map (db m195057) HM
Near this point, the Bellamy Road crossed the Santa Fe River. The road was named for its builder, John Bellamy, a civil engineer. Approved by Congress in 1824 and completed in 1826, it was the first Federally funded road in Florida, connecting . . . — — Map (db m155320) HM
On West Bryan Street near Bull Street, on the left when traveling west.
Savannah Historic District
has been designated a
Registered National Historic Landmark
Under the provisions of the Historic Sites Act of August 21, 1935 this site possesses exceptional value in commemorating or illustrating the . . . — — Map (db m5537) HM
Completed in 1915; Arrowrock Dam introduced a number
of innovative design and construction techniques for large concrete dams it served as the prototype for
other gravity-arch dams in the Western United States, and its construction demonstrated . . . — — Map (db m263631) HM
Between 1859 and 1862 the U.S. Army built a military wagon road between Fort Benton Montana, and Fort Walla Walla, Washington. This National Historic Civil Engineering Landmark was the first major engineered highway in the Pacific Northwest. — — Map (db m122863) HM
One of the finest examples of how civil engineering ingenuity shaped the development of society's quality of life in the 20th century
Designated: September 19, 2001 — — Map (db m287363) HM
[Text on the right]
The ASCE presented only ten such awards worldwide, each representing the most outstanding example of Civil engineering in a particular area of infrastructure over the past century.
Created in 1889, the District built canals . . . — — Map (db m155321) HM
On Pennington Rd 0.2 miles east of Columbia St, on the left when traveling east.
An aqueduct is a bridge carrying one body of water over another. The Duck Creek Aqueduct was originally built in 1843 to convey the canal over Duck Creek 16 feet below. Flood waters in 1847 destroyed the aqueduct, which was soon replaced by the . . . — — Map (db m55560) HM
On Main Street 0.1 miles east of Basin Street, on the left when traveling east.
This unique structure - a bridge for water - carries the canal across Duck Creek
Engineers designed this aqueduct (AH-kwuh-duckt) to carry the canal and boats above the creek.
Why would water need a bridge?
Canals rely on water . . . — — Map (db m258476) HM
On West Washington Street at Senate Avenue, on the right when traveling west on West Washington Street.
An Important Road
The National Road is a true American icon, conceived by George Washington, authorized by Thomas Jefferson, and traveled by Abraham Lincoln.
In 1806 construction of the National Road was approved by the US Congress to . . . — — Map (db m232658) HM
On Court Avenue (Kentucky Route 17) 0.1 miles north of East 3rd Street, on the right when traveling north.
John A Roebling (1806-1869), pioneer civil engineer, was the designer and builder of the Covington-Cincinnati Suspension Bridge which was completed in 1866. It served as the prototype for Roebling’s design of the Brooklyn Bridge, which was . . . — — Map (db m55563) HM
On North Common Street 0.5 miles north of Caddo Street.
Built 1887 as city's first waterworks. Contains original equipment in working order. Only example of its sort remaining in the United States of America, according to Smithsonian Institution. Declared a National Landmark in 1982. — — Map (db m140206) HM
On River Road (State Road 611-1) north of St. George Street, on the right when traveling north.
This structure is a combination railroad and highway bridge. Designed by the firm of Modjeski, Masters and Chase, with foundation recommendations by Dr. Karl Terzaghi. It was the first bridge to span the Mississippi River at New Orleans. The . . . — — Map (db m125232) HM
On Herbert Harvey Drive 0.5 miles south of Levee Road, on the left when traveling south.
About 18 miles below Ft. Jackson at Head of Passes, the Mississippi River branches into Southwest Pass, South Pass and Pass A Lutre before emptying into the Gulf of Mexico. As early as 1723 French colonists found navigation difficult and looked . . . — — Map (db m205283) HM
On River Road (State Highway 48) south of South Destrehan Avenue, on the left when traveling south.
The Outstanding Civil Engineering Achievement - 1984 Hale Boggs Bridge Awarded in a National Competition by the American Society of Civil Engineers. — — Map (db m109613) HM
On River Road (State Highway 18) north of Fre'Re Street, on the left when traveling north.
The Outstanding Civil Engineering Achievement - 1984 Hale Boggs Bridge Awarded in a National Competition by the American Society of Civil Engineers. — — Map (db m109557) HM
Near River Road 0.3 miles north of Eighth Street, on the left when traveling north.
The United States Army Corps of Engineers built this spillway to protect the
City of New Orleans from catastrophic flood events. The construction of this
structure marked the end of the levees-only policy and ushered in the era of
flood . . . — — Map (db m302522) HM
On North Causeway Boulevard, on the right when traveling south.
The original 23.86 mile-long structure, which now carries the Southbound traffic, was designed by the firm of Palmer & Baker. When opened in 1956, the structure was the longest bridge in the world by more than 15 miles. In building the bridge, which . . . — — Map (db m99805) HM
American
Society of
Civil
Engineers
1852
Portland Head Light
Portland Head Light was the first lighthouse completed and put into
service by the Federal Government under the Lighthouse Act of 1789
Completed 1791
Designated 2002 — — Map (db m161819) HM
Portland Head Light was the first lighthouse completed and put into service by the Federal government under the Lighthouse Act of 1789.
Completed 1791
Designated 2002 — — Map (db m259677) HM
On Harpswell Island Road (Maine Route 24) on Harpswell Island Road.
Plaque 1 National Historic Civil Engineering Landmark
Bailey Island Bridge
Harpswell, Maine
Presented 1984
Plaque 2
This 1150 ft. bridge is an exceptional
engineering solution to meet unusual
conditions and is the only one of . . . — — Map (db m108111) HM
On Sebago Lake State Park Road 1.9 miles east of U.S. 302, on the left when traveling north.
This lock, originally built of stone masonry in 1830, was a vital link in the 50 mile long waterway from Portland Harbor to Harrison at the head of Long Lake until the advent of the railroad in 1869. At one time 100 “canal boats” were . . . — — Map (db m59436) HM
On Congress Street just north of Kellogg Street, on the right when traveling north.
One of the earliest marine signal stations in the United States, this tower is unique in its engineering design and construction and contributed to the prosperity of Portland Harbor as a vital center of maritime commerce during the "Golden Age of . . . — — Map (db m186397) HM
On Thomas Hill Road 0.1 miles south of Ohio St., on the right when traveling south.
The Thomas Hill standpipe was designed by Ashley B. Tower of Tower and Wallace of New York and Holyoke, Mass. and built in 1897 by Major James M. Davis on land once owned by the Thomas brothers. Using a portable sawmill and blacksmith shop erected . . . — — Map (db m175789) HM
Front
Commenced, July 4th, 1833.
Finished, July 4th, 1835.
Rear
Johnathan Knight,
Chief Engineer
Caspar W. Wever,
Superintendent of Construction.
Designed by
Benjamin H. Latrobe. . . . — — Map (db m127) HM
On Foundry Street near Gorman Road, on the left when traveling north.
Spanning the Little Patuxent River is the sole surviving example of the bridging system invented, 1850, by Wendel Bollman, Baltimore engineer. It was the first system, entirely of iron, used by the Baltimore and Ohio railroad and the first in . . . — — Map (db m123610) HM
On MacArthur Boulevard, on the right when traveling east.
"… in our midst exists one of the most imposing and wonderful structures which engineering skill could devise …"
--William T.S. Curtis, November 1, 1897, from a paper read before the Columbia Historical Society.
As late as the mid-19th . . . — — Map (db m22636) HM
On Mouth of Monocacy Road 1.3 miles west of Dickerson Road (Maryland Route 28), on the right when traveling west.
Springing Over the Monocacy
Captain William McNeill of the U.S. Topographical Engineers called this aqueduct “…a work which, while it is highly ornamental, unites…in its plan and execution, ‘the true principles of economy, usefulness and . . . — — Map (db m305869) HM
Near the Woodrow Wilson Bridge Trail (U.S. I-95) 0.8 miles west of Oxon Hill Road (State Route 414).
[Center Panel]
This bridge is named in honor of Woodrow Wilson.
An early automobile enthusiast, he reportedly spent an average of two hours per day riding in his automobile to relax and “loosen his mind from the problems before him.” In . . . — — Map (db m19756) HM
On Riverview Drive just south of Pine Street, on the right when traveling south.
Riverside Village Historic District has been placed on the National Register of Historic Places in 2017 by the United States Department of the Interior — — Map (db m230570) HM
On Neponset Street north of Walpole Street, on the right when traveling north.
Constructed in 1835
National Register of Historic Places
Placed by Canton Historical Commission
Dedicated July 4th 1993
National Historic Civil Engineering Landmark
Designated by the American society of Civil Engineers
Dedicated . . . — — Map (db m308404) HM
On Granite Rail Court, on the right when traveling east.
National Historic Civil Engineering Landmark.
The Granite Railway
Designated by the American Society of Civil Engineers 1976
This marker commemorates the 150th anniversary of the ground breaking for the first commercial railroad in the . . . — — Map (db m49466) HM
Near 3rd Street, on the right when traveling south.
This stone and metal structure is Dry Dock 1, completed in 1833. As one of America’s first two granite dry docks, Dry Dock 1 made the repair of large naval ships faster, easier, and safer. Returning warships to sea duty in less time was a . . . — — Map (db m37697) HM
On State Street (2nd Street) south of Brady Street, on the left when traveling south.
This simply ornamented wrought-iron bridge was built in 1886. It replaced an earlier wooden one that had begun to fall into disrepair. Designed by the King Iron Bridge and Manufacturing Company of Cleveland, Ohio, the double-intersection Pratt . . . — — Map (db m69901) HM
Designed by David B. Steinman, and representing a new level of aerodynamic stability in suspension bridges for its time, the Mackinac Bridge was the first suspension bridge to incorporate specific design features to manage the forces imposed on it . . . — — Map (db m105762) HM
The Stone Arch Bridge of the Burlington Northern Railway is acknowledged to be one of the finest stone viaducts in the world, due to its massive masonry, lofty arches, and graceful curvature.
Constructed: 1882-1883 — — Map (db m152946)
Near West River Parkway west of Portland Avenue South.
"This viaduct...is the only one of its kind that spans the Father of Waters, and is one of the largest and most noteworthy in the United States.
Firmer than the earth which supports it, it is constructed to stand the test of time."
. . . — — Map (db m27042) HM
In 1879 St. Paul railroad magnate James J. Hill opened his "Manitoba line" to the Canadian border, linking the wheat fields of the Red River Valley with the flour mills of Minneapolis. To improve railroad access at the falls he built this 2,100-foot . . . — — Map (db m21031) HM
On North 1st Street north of Washington Avenue, on the right when traveling north.
Named for James B. Eads, the self-trained engineer who oversaw the design and construction from 1867 to 1874, Eads Bridge was the first to span the Mississippi River downstream of the Missouri River. It is now the oldest bridge on the Mississippi . . . — — Map (db m299558) HM
Dedicated to
the People of the United States
May 25, 1968
Lyndon B. Johnson
President of the United States
The City of St. Louis Missouri
The United States Territorial
Expansion Memorial Committee
[On May 28, 1987, the . . . — — Map (db m26866) HM
On Market Street, on the right when traveling east.
has been designated a
National
Historic Landmark
This site possesses national
significance in commemorating
the history of the
United States of America
———————
[Markers on interior . . . — — Map (db m62210) HM
On Clayton Avenue 0.4 miles west of South Kingshighway, on the right when traveling west.
[Top plaque:]
The River Des Peres Sewage and Drainage Works extends 14 miles from the city limits northwest to Delmar and Skinker to the Mississippi River south of the city.
Four miles of massive, enclosed reinforced concrete sewers . . . — — Map (db m141182) HM
Near West Argonne Drive 0.1 miles west of South Kirkwood Road (U.S. 61/67), on the right when traveling east.
James Pugh Kirkwood was born in Edinburgh, Scotland. He came to the United States in 1832 and was appointed Resident Engineer for the Western Railway of Massachusetts, and later the Long Island Railroad. He won recognition for the rapid . . . — — Map (db m140854) HM
On Front Street near 17th Street, on the right when traveling north.
Captain John Mullan started surveying the Mullen Road in 1853 and began construction in 1859 of the 624-mile wagon road that linked Fort Benton to the head of navigation on the Columbia. Indian wars slowed him somewhat, but Mullan opened his route . . . — — Map (db m142246) HM
Near Bancroft Street 0.2 miles east of Bancroft Plaza.
National Historic Civil Engineering Landmark
American Society of Civil Engineers 1852
Union Pacific Railroad
The First Transcontinental Railroad
Completed May 10, 1869
ASCE July 13, 2019 — — Map (db m264801) HM
One of the finest examples of how civil engineering ingenuity shaped the development of society's quality of life in the 20th century. — — Map (db m31900) HM
On South B Street north of Taylor Street, on the right when traveling south.
Following the discovery of silver and gold, the miners obtained their water from the small streams or from the springs located in the canyons such as Ophir Ravine, in Virginis City, and Bullion and Crown Point ravines above Gold Hill. Originally . . . — — Map (db m263686) HM
On West Main Street (New Hampshire Route 149) at U.S. 202, on the right when traveling east on West Main Street.
Beginning in the 1830's, a few arched granite highway bridges were built in southern New Hampshire under the supervision of engineers from major manufacturing centers. By the 1850's, rural stonemasons had mastered the art of building such bridges . . . — — Map (db m97139) HM
On Chase Road (SR 12A) at Bridge Street on Chase Road (SR 12A).
Built in 1866 at a cost of $9,000, this is the longest wooden bridge in the United States and the longest two-span covered bridge in the world. The fourth bridge at this site, the 460-foot structure was built by Bela J. Fletcher (1811-1877) of . . . — — Map (db m74586) HM
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