1 ► Alabama, Mobile County, Le Moyne — Ellicott's Stone — Erected April 9th, 1799 —

On U.S. 43 at milepost 19, 0.1 miles south of Lofton Road, on the right when traveling north.

2 ► Alaska, Fairbanks North Star Borough, Fairbanks, Downtown — Alaska Highway/La route de l'Alaska Marker — International Historic Civil Engineering Landmark — Monument historique international du génie civil —

On 1st Avenue at Cushman Street, on the left when traveling east on 1st Avenue.

3 ► Alaska, Juneau Borough, Juneau, Downtown Juneau — Alaska Governor's Mansion —

On Calhoun Avenue at Indian, on the left when traveling north on Calhoun Avenue.

4 ► Alaska, Southeast Fairbanks Census Area, Delta Junction — Delta Junction, Alaska — Northern Terminus of the "Alcan" Highway —

On Alaska Highway (at milepost 1,422) at Richardson Highway, on the left when traveling north on Alaska Highway.

5 ► Arizona, Cochise County, San Simon — The San Simon Rest Area - Percy Jones, Jr. —

Near Interstate 10 at milepost 388.

6 ► Arizona, Cochise County, San Simon — The San Simon Rest Area - Percy Jones, Jr. —

Near Interstate 10 (Interstate 10).

7 ► Arizona, Coconino County, Grand Canyon National Park — Kaibab Trail Suspension Bridge — National Historic Civil Engineering Landmark — Black Bridge —

On Rim Trail north of Yavapai Point, on the right when traveling west.

8 ► Arizona, Coconino County, Marble Canyon — Navajo Bridge —

Near U.S. 89A at milepost 538.

9 ► Arizona, Coconino County, Page — Colorado River Storage Project / Glen Canyon Dam — Reclamation: Managing Water in the West —

Near U.S. 89.

10 ► Arizona, Maricopa County, Mesa — Prehistoric Irrigation in the Salt River Valley —

Near North Horne Avenue 0.4 miles south of East McKellips Road.

11 ► Arizona, Yavapai County, Bumble Bee — The Sunset Point Rest Area — Dedicated to the Engineering Achievement of — William Clayton LeFebvre, 1890-1964 —

Near Interstate 17.

12 ► California, Alameda County, San Leandro — Chabot Dam —

Near Estudillo Avenue.

13 ► California, Alameda County, Sunol — Alameda Creek Water System — Sunol Water Temple Restoration —

Near Paloma Way.

14 ► California, Humboldt County, Fernbridge — Fernbridge — Eel River Bridge —

On California Route 211 at Depot Street, on the left when traveling south on California Route 211.

15 ► California, Kern County, Lebec — Interstate Highway 5 —

Near Interstate 5, 0.8 miles north of Frazier Mountain Park Road.

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16 ► California, Kern County, Tehachapi — Tehachapi Pass Railroad Line — Constructed 1874 – 1876 — Commemorated October 1998 —

On Woodford-Tehachapi Road, 3.2 mi E of Keene exit, on the left when traveling east.

17 ► California, Los Angeles County, Angeles National Forest — The “Ridge Route” — California Historic Civil Engineering Landmark — Constructed 1914-1915 —

Near Vista Del Lago Road at Interstate 5.

18 ► California, Los Angeles County, Los Angeles, Downtown Los Angeles — Los Angeles City Hall — Local Historic Civil Engineering Landmark —

Near Main Street north of 1st Street.

19 ► California, Los Angeles County, Los Angeles, Granada Hills — Los Angeles Aqueduct Filtration Plant —

Near Sepulveda Boulevard 0.5 miles north of Roxford Street.

20 ► California, Los Angeles County, Los Angeles, Sylmar — 653 — "The Cascades" —

On Foothill Boulevard 0.1 miles north of Balboa Boulevard, on the right when traveling north.

21 ► California, Los Angeles County, Los Angeles, Sylmar — 653 — The Cascades —

On Foothill Boulevard 0.1 miles west of Balboa Boulevard, on the right when traveling west.

22 ► California, Los Angeles County, Pasadena, South Arroyo — Colorado Street Bridge — Historic Civil Engineering Landmark —

On Colorado Boulevard 0.1 miles west of Orange Grove Boulevard, on the left when traveling west.

23 ► California, Los Angeles County, Torrance, Old Torrance — Pacific Electric Railway — El Prado Bridge —

On Torrance Boulevard at Bow Avenue, on the right when traveling east on Torrance Boulevard.

24 ► California, Marin County, Sausalito — 974 — The Golden Gate Bridge

Near U.S. 101, on the right when traveling north. Reported damaged.

25 ► California, Mono County, Lee Vining — The Tioga Pass Road — Constructed 1883 & 1910 - Commemorated 2002 —

On Tioga Pass Road (State Highway 120), on the right when traveling east.

26 ► California, Nevada County, Penn Valley — 390 — Bridgeport Historic District —

Near Pleasant Valley Road 7.5 miles north of Route 20, on the left when traveling north.

27 ► California, Orange County, San Juan Capistrano — 54 — Mission San Juan Capistrano —

On Ortega Highway at Camino Capistrano, on the left when traveling east on Ortega Highway.

28 ► California, Orange County, Tustin — Marine Corps Air Station Tustin — Blimp Hangars —

On Park Avenue at Victory Road, on the right when traveling south on Park Avenue.

29 ► California, Orange County, Yorba Linda — 40 — Irrigation in Orange County —

Near Santa Ana Canyon Road.

30 ► California, Sacramento County, Sacramento, Old Sacramento — Sacramento Water Works — Historic Civil Engineering Landmark —

On I street at Front Street, on the right when traveling west on I street.

31 ► California, San Bernardino County, Mentone — Henry Harbinson Sinclair — 1858-1914 —

On Mill Creek Road (California Route 38) 1 mile east of Bryant Street, on the right when traveling east.

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32 ► California, San Diego County, San Diego, Balboa Park — Cabrillo Bridge —

On El Prado east of Balboa Drive, on the right when traveling east.

33 ► California, San Francisco City and County, San Francisco, Golden Gate Park — Alvord Lake Bridge — National Historic Civil Engineering Landmark — Built 1889 —

Near Haight Street west of Stanyan Street.

34 ► California, San Francisco City and County, San Francisco, Nob Hill — San Francisco Cable Car System — Ferries & Cliff House Railway Company — Cable Car Museum —

Near Mason Street at Washington Street, on the left when traveling north.

35 ► California, San Francisco City and County, San Francisco, Presidio of San Francisco — The Golden Gate Bridge — Vision, Genius and Expert Care —

Near Lincoln Boulevard west of Chrissy Field Avenue.

36 ► California, San Mateo County, Burlingame — 100th Anniversary of the Crystal Springs Dam —

On Skyline Boulevard west of Crystal Springs Road when traveling south.

37 ► California, San Mateo County, Pescadero — 930 — Pigeon Point Lighthouse —

Near Pigeon Point Road near Highway 1.

38 ► California, Santa Barbara County, Santa Barbara — Cold Spring Arch Bridge — Historic Civil Engineering Landmark — ASCE —

On Stagecoach Road near San Marcos Pass Road ( Route 154).

39 ► California, Santa Barbara County, Santa Barbara — Santa Barbara Mission Early Water Supply — Historic Civil Engineering Landmark —

Near Los Olivos Street north of Alameda Padre Serra, on the right when traveling north.

40 ► California, Yuba County, Camptonville — Lester Allen Pelton —

On Cleveland Avenue, on the right when traveling west.

41 ► Colorado, La Plata County, Durango — Durango - Silverton Narrow Gauge Railroad —

On Main Avenue at 5th Street, on the right when traveling south on Main Avenue.

42 ► Colorado, Montezuma County, Cortez — Prehistoric Mesa Verde Reservoirs —

Near State Highway 10.

43 ► Colorado, Montezuma County, Mesa Verde National Park — Far View Reservoir —

Near State Highway 10 1.3 miles south of Wetherill Mesa Road.

44 ► Florida, Collier County, Naples — Bay City Walking Dredge — National Historic Mechanical Engineering Landmark — 1924 —

Near Tamiami Trail East (U.S. 41) south of San Marco Road (County Route 92), on the right when traveling south.

45 ► Florida, Columbia County, High Springs — Bellamy Road — Florida Historic Civil Engineering Landmark —

Near Oleno Park Road near U.S. 441.

46 ► Florida, St. Johns County, St. Augustine, Historic District — Castillo de San Marcos — National Historic Civil Engineering Landmark —

On South Castillo Drive (State Road A1A) (Business U.S. 1) at Cuna Street, on the right when traveling north on South Castillo Drive (State Road A1A).

47 ► Georgia, Chatham County, Savannah, North Historic District — Savannah Historic District —

On West Bryan Street near Bull Street, on the left when traveling west.

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48 ► Idaho, Boise County, Robie Creek — Arrowrock Dam — National Historic Civil Engineering Landmark —

On Arrowrock Road.

49 ► Idaho, Kootenai County, Coeur d'Alene — The Mullan Road — Mullan Road Historical Site —

On Forest Road N 3098 near Interstate 90.

50 ► Illinois, Cook County, Chicago, River North — Metropolitan Water Reclamation District of Greater Chicago's Wastewater System — Civil Engineering Monument of the Millennium —

On East Erie Street east of Rush Street.

51 ► Illinois, Cook County, Chicago, River North — Sidestream Elevated Pool Aeration Project —

On East Erie Street east of Rush Street.

52 ► Illinois, Cook County, Chicago, River North — The Metropolitan Sanitary District of Greater Chicago —

On East Erie Street east of Rush Street.

53 ► Illinois, Cook County, Chicago, The Loop District — Monument of the Millennium — Wastewater System —

On North Breakwater Access.

54 ► Indiana, Franklin County, Metamora — Duck Creek Aqueduct —

On Pennington Rd 0.2 miles east of Columbia St, on the left when traveling east.

55 ► Indiana, Franklin County, Metamora — The Duck Creek Aqueduct — A Bridge for Water —

On Main Street 0.1 miles east of Basin Street, on the left when traveling east.

56 ► Indiana, Marion County, Indianapolis, Mile Square — Historic National Road / Make History, Drive It — The Road That Built The Nation —

On West Washington Street at Senate Avenue, on the right when traveling west on West Washington Street.

57 ► Kentucky, Kenton County, Covington — John A. Roebling Bridge —

On Court Avenue (Kentucky Route 17) 0.1 miles north of East 3rd Street, on the right when traveling north.

58 ► Kentucky, Livingston County, Grand Rivers — Kentucky Dam — National Historic Civil Engineering Landmark — Tennessee Valley Authority —

On Kentucky Dam Road.

59 ► Louisiana, Caddo Parish, Shreveport, Allendale-Lakeside — McNeill St. Pump Station — Historic Site — Shreveport —

On North Common Street 0.5 miles north of Caddo Street.

60 ► Louisiana, Jefferson Parish, Elmwood — Huey P. Long Bridge, Louisiana — National Historic Civil Engineering Landmark —

On River Road (State Road 611-1) north of St. George Street, on the right when traveling north.

61 ► Louisiana, Plaquemines Parish, Buras — Eads Jetties —

On Herbert Harvey Drive 0.5 miles south of Levee Road, on the left when traveling south.

62 ► Louisiana, St. Charles Parish, Destrehan — Hale Boggs Bridge —

On River Road (State Highway 48) south of South Destrehan Avenue, on the left when traveling south.

63 ► Louisiana, St. Charles Parish, Luling — Hale Boggs Bridge —

On River Road (State Highway 18) north of Fre'Re Street, on the left when traveling north.

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64 ► Louisiana, St. Charles Parish, Norco — Bonnet Carré Spillway — National Historic Civil Engineering Landmark —

Near River Road 0.3 miles north of Eighth Street, on the left when traveling north.

65 ► Louisiana, St. Tammany Parish, Mandeville — Lake Pontchartrain Causeway Bridge — National Historic Civil Engineering Landmark —

On North Causeway Boulevard, on the right when traveling south.

66 ► Maine, Cumberland County, Cape Elizabeth — Portland Head Light — National Historic Civil Engineering Landmark —

On Shore Road, on the right when traveling north.

67 ► Maine, Cumberland County, Cape Elizabeth — Portland Head Light — National Historic Civil Engineering Landmark —

Near Captain Strout Circle.

68 ► Maine, Cumberland County, Harpswell — Bailey Island Bridge —

On Harpswell Island Road (Maine Route 24) on Harpswell Island Road.

69 ► Maine, Cumberland County, Naples — Songo Lock —

On Sebago Lake State Park Road 1.9 miles east of U.S. 302, on the left when traveling north.

70 ► Maine, Cumberland County, Portland, East End — Portland Observatory, Portland, Maine — Built 1807 — National Historic Civil Engineering Landmark —

On Congress Street just north of Kellogg Street, on the right when traveling north.

71 ► Maine, Penobscot County, Bangor — Bangor Water District Thomas Hill Standpipe —

On Thomas Hill Road 0.1 miles south of Ohio St., on the right when traveling south.

72 ► Maryland, Baltimore County, Relay — The Thomas Viaduct —

Near Railroad Avenue near Viaduct Avenue.

73 ► Maryland, Howard County, Savage — Bollman Iron Truss Bridge — 1869 —

On Foundry Street near Gorman Road, on the left when traveling north.

74 ► Maryland, Montgomery County, Cabin John — Building The Cabin John Bridge —

On MacArthur Boulevard, on the right when traveling east.

75 ► Maryland, Montgomery County, Dickerson — Springing Over the Monocacy / The Enduring Aqueduct / Preservation Through Partnerships — Chesapeake and Ohio Canal National Historical Park — National Park Service, U.S. Department of the Interior —

On Mouth of Monocacy Road 1.3 miles west of Dickerson Road (Maryland Route 28), on the right when traveling west.

76 ► Maryland, Prince George's County, Fort Washington — Woodrow Wilson Memorial Bridge —

Near the Woodrow Wilson Bridge Trail (U.S. I-95) 0.8 miles west of Oxon Hill Road (State Route 414).

77 ► Massachusetts, Franklin County, Conway — Bardwells Ferry Bridge —

On Bardwells Ferry Road 0.2 miles north of Wholey Road when traveling north.

78 ► Massachusetts, Franklin County, Gill, Riverside — 278 — Riverside Village Historic District — Town of Gill, Massachusetts —

On Riverview Drive just south of Pine Street, on the right when traveling south.

79 ► Massachusetts, Norfolk County, Canton — Canton Viaduct —

On Neponset Street north of Walpole Street, on the right when traveling north.

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80 ► Massachusetts, Norfolk County, Quincy — The Granite Railway —

On Granite Rail Court, on the right when traveling east.

81 ► Massachusetts, Plymouth County, Brockton — Brockton Railroad Viaducts and Bridges — Massachusetts Historic Civil Engineering Landmark —

On Centre Street (Massachusetts Route 123) west of Commercial Street, on the right when traveling west.

82 ► Massachusetts, Suffolk County, Boston, Charlestown — Dry Dock 1 — Boston Nat’l Hist Pk — Charlestown Navy Yard —

Near 3rd Street, on the right when traveling south.

83 ► Michigan, Allegan County, Allegan — S549A — The Second Street Bridge —

On State Street (2nd Street) south of Brady Street, on the left when traveling south.

84 ► Michigan, Mackinac County, St. Ignace, Moran Township — Mackinac Bridge, Michigan — National Historic Civil Engineering Landmark —

Near Boulevard Drive.

85 ► Minnesota, Hennepin County, Minneapolis, Downtown East — Stone Arch Bridge - Great Northern Railway — National Historic Civil Engineering Landmark —

Near West River Parkway.

86 ► Minnesota, Hennepin County, Minneapolis, Downtown West — Stone Arch Bridge —

Near West River Parkway west of Portland Avenue South.

87 ► Minnesota, Hennepin County, Minneapolis, Saint Anthony Main — The Stone Arch Bridge — Saint Anthony Falls Heritage Trail —

Near 6th Avenue Southeast.

88 ► Missouri, St. Louis, Downtown — The Eads Bridge — National Historic Civil Engineering Landmark —

On North 1st Street north of Washington Avenue, on the right when traveling north.

89 ► Missouri, St. Louis, Downtown — The Gateway Arch — Jefferson National Expansion Memorial —

On North Leonor K. Sullivan Boulevard.

90 ► Missouri, St. Louis, Downtown West — Union Station —

On Market Street, on the right when traveling east.

91 ► Missouri, St. Louis, Forest Park — River Des Peres Sewage and Drainage Works —

On Clayton Avenue 0.4 miles west of South Kingshighway, on the right when traveling west.

92 ► Missouri, St. Louis County, Kirkwood — Remembering the Achievements of James P. Kirkwood — March 27, 1807 - April 22, 1877 — Co-Founder (1852) and Second President (1867-1868) of the American Society of Civil Engineers —

Near West Argonne Drive 0.1 miles west of South Kirkwood Road (U.S. 61/67), on the right when traveling east.

93 ► Montana, Chouteau County, Fort Benton — Mullan Wagon Road —

On Front Street near 17th Street, on the right when traveling north.

94 ► Nebraska, Douglas County, Omaha, Riverview — Union Pacific Railroad — The First Transcontinental Railroad — National Historic Civil Engineering Landmark —

Near Bancroft Street 0.2 miles east of Bancroft Plaza.

95 ► Nebraska, Keith County, Ogallala — Central Nebraska Project —

On Scenic State Highway 61 6.1 miles north of North Spruce Street, on the left when traveling north.

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96 ► Nevada, Clark County, Boulder City — Civil Engineering Monument of the Millennium — Hoover Dam —

On U.S. 93, on the right when traveling west.

97 ► Nevada, Clark County, Boulder City — Hoover Dam —

On U.S. 93, on the right when traveling west.

98 ► Nevada, Storey County, Virginia City — 14 — Virginia & Gold Hill Water Company — Comstock Historical Marker No. 14 — 130 South B St., Virginia, City, NV —

On South B Street north of Taylor Street, on the right when traveling south.

99 ► New Hampshire, Hillsborough County, Hillsborough — 203 — Stone Arch Bridges —

On West Main Street (New Hampshire Route 149) at U.S. 202, on the right when traveling east on West Main Street.

100 ► New Hampshire, Sullivan County, Cornish — 158 — Cornish-Windsor Bridge —

On Chase Road (SR 12A) at Bridge Street on Chase Road (SR 12A).

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