"Montezuma's Castle," Beaver Creek, Arizona, 3 miles from Fort Verde, ...
No. 12. "Views in Arizona" and "Mitchell & Baer, Prescott, Arizona" on verso. Edgar A. Mearns Collection.
View of "Montezuma's Castle," 3 miles north of Fort Verde, Arizona, s...
No. 11. Edgar A. Mearns Collection. Public domain photograph - historical image of Arizona, United States, free to use, no copyright restrictions image - Picryl description
Bay State Limited, N.Y., N.H. & H. Railroad passing Guilford, Conn. at...
Photoprint copyrighted by H.S. Wedmore, Guilford, Conn. This record contains unverified data from caption card.
"Royal Blue Line Limited", at the speed of 55 miles an hour. B&O, P&R ...
Photo copyrighted by F.W. Blauvelt, New York. This record contains unverified, old data from caption card. Caption card tracings: Shelf.
General Miles, Shafter, Wheeler returning from the conference with Gen...
Photograph showing William Shafter, Joseph Wheeler, and Nelson Miles riding on horseback. Photoprint by William Dinwiddie. Title and date from item.
Sveadahl, the first courthouse in McPherson Co., post office, general ...
Photoprint copyrighted by B.G. Gröndal. This record contains unverified, old data from caption card. Caption card tracings: Courthouses; Geogr.
A view of the Lower Ochoco Valley, two miles north of Prineville, Croo...
J144336 U.S. Copyright Office Copyright deposit; B. B. Bakowski; August 17, 1910. Copyright claimant's address: Prineville, Ore.
New twin screw steamship "Europa" of "La Veloce" Navigazione Italiana ...
Unprocessed in PR 06 CN 038, c47 Public domain scan of vintage postcard, ocean liner, transatlantic, no copyright restrictions image - Picryl description
Harlow Lewis Calvert Farmstead, Barn, South side of U.S. Route 50, 1.9...
Significance: The Harlow Lewis Calvert Farmstead is a rare surviving example of Allegheny Plateau agricultural practices, land uses, and farm architecture. The barn was constructed in 1893, for grain and feed s... More
Jansonist Colony, Grain Elevator, 2 miles east of Bishop Hill, Bishop ...
Survey number: HABS IL-169-Y Building/structure dates: ca. 1870 Initial Construction National Register of Historic Places NRIS Number: 70000244
Chesapeake & Ohio Canal, Lockhouse at Lock 26, 39.4 miles above tidewa...
Survey number: HABS MD-745 Public domain photograph of wooden church building, free to use, no copyright restrictions image - Picryl description
New Coast Guard boat capable of 35 miles an hour. Washington, D.C., Ma...
A black and white photo of a boat in the water, Library of Congress Harris and Ewing collection Title from unverified data received with the Harris & Ewing Collection on the negative or negative sleeve. Gift; ... More
A man sitting on top of a hay bale next to a horse. Great Depression F...
Picryl description: Public domain photograph of a farmer, 1930s great depression, dust bowl era, 20th century, free to use, no copyright restrictions.
A black and white photo of a man riding a horse, Great Depression. FSA...
Picryl description: Public domain image of a rural landscape, horses, horse riding, farm animals, farmers, livestock, free to use, no copyright restrictions image.
![[Portrait of Howard McGhee, Brick Fleagle, and Miles Davis, New York, N.Y., ca. Sept. 1947]](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE5NDcvMDEvMDEvcG9ydHJhaXQtb2YtaG93YXJkLW1jZ2hlZS1icmljay1mbGVhZ2xlLWFuZC1taWxlcy1kYXZpcy1uZXcteW9yay1ueS1jYS1zZXB0LTEwMjQuanBn/40/40/webp "[Portrait of Howard McGhee, Brick Fleagle, and Miles Davis, New York, N.Y., ca. Sept. 1947]")
[Portrait of Howard McGhee, Brick Fleagle, and Miles Davis, New York, ...
Reference print available in Music Division, Library of Congress. Purchase William P. Gottlieb General information about the Gottlieb In: "Posin'," Down Beat, v. 14, no. 19 (Sept. 10, 1947), p. 6. Forms part o... More
Richard Mahler (5) is the Fire Island School's youngest pupil and live...
Photograph shows a boy skipping away from his house at Fire Island Lighthouse carrying a book bag and lunch box. NYWT&S staff photograph. Title from news agency caption on item. Stamped date: May 8, 1952. Forms... More
Sublet Mine No. 6, Housing Unit No. 6, East side of Willow Creek Valle...
Survey number: HAER WY-54-K Public domain image related to President Abraham Lincoln, gelatin silver print, free to use, no copyright restrictions image - Picryl description
Coral Castle, the creation of reclusive Edward Leedskalnin, who, using...
Digital image produced by Carol M. Highsmith to represent her original film transparency; some details may differ between the film and the digital images. Title, date, and keywords provided by the photographer.... More
Loleta Recreation Area, Bath House, Six miles Southeast of intersectio...
Significance: Constructed by the Civilian Conservation Corps between the years of 1933 and 1936. The CCC work project was initiated by President Roosevelt to put young men to work while at the same time assisti... More
Juniata Mill Complex, Mine & Camp Residence, 22.5 miles Southwest of H...
Survey number: HAER NV-24-L Public domain photograph of wooden church building, free to use, no copyright restrictions image - Picryl description
Promontory Route Railroad Trestles, Trestle 790C, 11 miles west of Cor...
Significance: This trestle is one of many remaining Promontory Route railroad trestles which were originally part of the first transcontinental railroad route across the United States. These trestles represent... More
Milltown Dam, Powerhouse, Clark Fork River, 6 miles upstream from Miss...
Survey number: HAER MT-43-A Building/structure dates: 1908 Initial Construction
Owl Gap Cut. 900 feet long, 45 feet deep. 80 miles from Sacramento
No. 91. Part of series: Central Pacific Railroad, California, scenes in the Sierra Nevada Mountains.
Joyce Estate, Mary Louise Cabin, Chippewa National Forest Road 2144, 3...
Significance: ... this building was completed shortly after the construction of the Main Cabin and the initial three sleeping cabins. It apparently is one of the seven "cottages" mentioned in the "Grand Rapids... More
Gould Farm Bridge, Spanning Shoal Creek, 5 miles South of U.S. Highway...
Significance: The main span of the Gould Farm bridge is an example of common Pratt truss used extensively through the country from 1844 to the early part of this century. It was fabricated by the Cleveland Bri... More
Gould Farm Bridge, Spanning Shoal Creek, 5 miles South of U.S. Highway...
Significance: The main span of the Gould Farm bridge is an example of common Pratt truss used extensively through the country from 1844 to the early part of this century. It was fabricated by the Cleveland Bri... More
Sublet Mine No. 6, Fan House, North structure, west side of Willow Cre...
Significance: The fan house performed a critical function within the complex by providing ventilation to the underground mine workers. // Constructed of cut stone and concrete in its lower level with brick wall... More
Granite Hill Plantation, Quarry No. 3, South side of State Route 16, 1...
Significance: Granite Hill Plantation historically consisted of 1,547 acres amassed by Andrew Jackson Lane, a wealthy Hancock County planter. The plantation was one of the largest in the county, and is associa... More
Granite Hill Plantation, Quarry No. 3, South side of State Route 16, 1...
Significance: Granite Hill Plantation historically consisted of 1,547 acres amassed by Andrew Jackson Lane, a wealthy Hancock County planter. The plantation was one of the largest in the county, and is associa... More
Granite Hill Plantation, Quarry No. 3, South side of State Route 16, 1...
Significance: Granite Hill Plantation historically consisted of 1,547 acres amassed by Andrew Jackson Lane, a wealthy Hancock County planter. The plantation was one of the largest in the county, and is associa... More
Fort Totten, Adjutant's Office, 12 miles southwest of Devils Lake City...
Significance: An excellent, well-preserved example of a military post of the Indian War period in the trans-Mississippi West. Unprocessed Field note material exists for this structure: FN-5 Survey number: HAB... More
Bluebird Dam, On Ouzel Creek 7 miles west of Allenspark, Allenspark, B...
Significance: Completed ca. 1923, it is locally significant to Boulder County as an intact example of an early 20th century, and relatively uncommon, arch concrete dam. The dam documents an important engineerin... More
Kachess Dam, Inlet Channel, Kachess River, 1.5 miles north of Intersta...
Survey number: HAER WA-79-F Public domain photograph of quarry, mining industry, miners, free to use, no copyright restrictions image - Picryl description
Kachess Dam, Inlet Channel, Kachess River, 1.5 miles north of Intersta...
Survey number: HAER WA-79-F Public domain scan of a plan of settlement buildings, free to use, no copyright restrictions image - Picryl description
Joyce Estate, Main Cabin, Chippewa National Forest Road 2144, 3 miles ...
Significance: ... the Main Cabin was constructed during the estate's first season in 1917 to serve as a central dining and socializing area for Joyce Family members and their guests. Food preparation occurred ... More
Alexandre Pigeon Ranch, New Mexico State Highway 50, 1.1 miles south o...
Significance: During March 26-28, 1862, Union forces defeated Confederates from Texas in the significant Civil War Battle of Glorieta Pass. The heaviest fighting occurred at Pigeon's Ranch, March 28, the hacien... More
Kachess Dam, Dike Closing 1913 Spillway, Kachess River, 1.5 miles nort...
Survey number: HAER WA-79-C Public domain photograph - historical image of Washington State, United States, free to use, no copyright restrictions image - Picryl description
Hacienda Azurarera Santa Elena, Sugar Mill Ruins, 1.44 miles North of ...
Significance: The ruins are the only extant remains pertaining to an industrial building in Puerto Rico dating back to the late 18th century. They illustrate the transition from a cattle-driven vertical wooden... More
Hacienda Azurarera Santa Elena, Sugar Mill Ruins, 1.44 miles North of ...
Significance: The ruins are the only extant remains pertaining to an industrial building in Puerto Rico dating back to the late 18th century. They illustrate the transition from a cattle-driven vertical wooden... More
Hacienda Azurarera Santa Elena, Sugar Mill Ruins, 1.44 miles North of ...
Significance: The ruins are the only extant remains pertaining to an industrial building in Puerto Rico dating back to the late 18th century. They illustrate the transition from a cattle-driven vertical wooden... More
Hacienda Azurarera Santa Elena, Sugar Mill Ruins, 1.44 miles North of ...
Significance: The ruins are the only extant remains pertaining to an industrial building in Puerto Rico dating back to the late 18th century. They illustrate the transition from a cattle-driven vertical wooden... More
Hacienda Azurarera Santa Elena, Sugar Mill Ruins, 1.44 miles North of ...
Significance: The ruins are the only extant remains pertaining to an industrial building in Puerto Rico dating back to the late 18th century. They illustrate the transition from a cattle-driven vertical wooden... More
Hacienda Azurarera Santa Elena, Sugar Mill Ruins, 1.44 miles North of ...
Significance: The ruins are the only extant remains pertaining to an industrial building in Puerto Rico dating back to the late 18th century. They illustrate the transition from a cattle-driven vertical wooden... More
Pennsylvania Railway Ore Dock, Lake Erie at Whiskey Island, approximat...
Significance: When built, the Pennsylvania Railway Ore Dock was the largest ore-unloading dock on the Great Lakes. The dock featured four Hulett unloaders with bucket capacities of 17 tons; a 15-ton capacity o... More
Pennsylvania Railway Ore Dock, Lake Erie at Whiskey Island, approximat...
Significance: When built, the Pennsylvania Railway Ore Dock was the largest ore-unloading dock on the Great Lakes. The dock featured four Hulett unloaders with bucket capacities of 17 tons; a 15-ton capacity o... More
Boyer Ranch, Gilbert's Storeroom, 44 miles east of Fallon, on U.S. Hig...
Significance: The stone building was erected by the Gilbert Brothers ca. 1860-1866. Nevada Place Names states that Dixie Valley was settled by southern sympathizers in 1861 and in that same year the second gol... More
Boyer Ranch, Gilbert's Storeroom, 44 miles east of Fallon, on U.S. Hig...
Significance: The stone building was erected by the Gilbert Brothers ca. 1860-1866. Nevada Place Names states that Dixie Valley was settled by southern sympathizers in 1861 and in that same year the second gol... More
Vanadium Corporation of America (VCA) Naturita Mill, 3 miles Northwest...
Significance: From the early 1940s to the end of the Cold War, the mill played a prominent role in national and international events related initially to the U.S. Army's WWII Manhattan Project, and later to the... More
Skagit Power Development, Gorge High Dam, On Skagit River, 2.9 miles u...
Unprocessed Field note material exists for this structure: FN-5 Survey number: HAER WA-24-C Building/structure dates: 1961 Initial Construction
Chesapeake & Ohio Canal, Section House, Above Lock 66, 156 miles above...
See also HABS No. DC-147 for list of other C&O Canal structures. Survey number: HABS MD-807
Miles Bott House, 216 Cowardin Avenue, Richmond, Independent City, Vir...
Unprocessed Field note material exists for this structure: FN-29, FN-30 Survey number: HABS VA-119 Building/structure dates: ca. 1875 Initial Construction
Miles Bott House, 216 Cowardin Avenue, Richmond, Independent City, Vir...
Unprocessed Field note material exists for this structure: FN-29, FN-30 Survey number: HABS VA-119 Building/structure dates: ca. 1875 Initial Construction
Miles Bott House, 216 Cowardin Avenue, Richmond, Independent City, Vir...
Unprocessed Field note material exists for this structure: FN-29, FN-30 Survey number: HABS VA-119 Building/structure dates: ca. 1875 Initial Construction
Chesapeake & Ohio Canal, Warehouse, White's Ferry, 35.5 miles above ti...
Survey number: HABS MD-742 Public domain photograph of wooden church building, free to use, no copyright restrictions image - Picryl description
Rainbow Hydroelectric Facility, House No. 16, On north bank of Missour...
Significance: It is significant for its association with the industrial development of Montana and the consolidation of most of Montana's electric industry into the Montana Power Company. The district is also a... More
Petit Manan Light Station, 2.5 miles south of Petit Manan Point, Milbr...
Survey number: HABS ME-194
Elm Creek Silo, 2.9 miles Southeast of Leaday Townsite, Voss, Coleman ...
Significance: This silo is a surviving example of a group of several silos built in the period just before the outbreak of World War I, when its site and much of the surrounding lands comprising the old Day Ran... More
Hinds Pump Plant, East of Joshua Tree National Monument, 5 miles north...
Survey number: HAER CA-246 Public domain photograph - historical image of California, United States, free to use, no copyright restrictions image - Picryl description
General Miles House, Highway 10, Miles City, Custer County, MT
Significance: This building was the personal residence of General Nelson A. Miles when it was first completed in 1877. The building had the first telephone in Montana and was the first to have a telegraph key, ... More
Phillips House, 0.20 miles southwest of the intersection of Greathouse...
Significance: The farmstead stands on a 1.64-acre parcel in the Joshua Willshire survey in western Ellis County. The house, a front-gabled Craftsman bungalow, and its associated outbuildings are some of the las... More
Fort Leavenworth, Kansas, 309 miles west of St. Louis, Mo.
No. 51. Part of series: Across the continent on the Union Pacific Railway, Eastern Division. Alexander Gardner (October 17, 1821 - December 10, 1882) was a Scottish photographer who is best known for his phot... More
Fort Totten, 12 miles southwest of Devils Lake City off Route 57, Devi...
Significance: The Fort Totten State Historic Site, administered by the State Historical Society of North Dakota (State Historical Board), is one of the best preserved military posts of the Trans-Mississippi Wes... More
Fort Sheridan, 25 miles Northeast of Chicago, on Lake Michigan, Lake F...
Significance: Fort Sheridan is an important turn-of-the century military post planned and constructed during a period of transition in national policy which signaled the closing of temporary frontier posts and ... More
Juniata Mill Complex, Mine Camp Building, 22.5 miles Southwest of Hawt...
Survey number: HAER NV-24-E Public domain photograph of wooden church building, free to use, no copyright restrictions image - Picryl description
Chesapeake & Ohio Canal, Lockhouse at Lock 72, 174.4 miles above tidew...
See HABS No. DC-147 for list of other C&O Canal structures. Unprocessed Field note material exists for this structure: FN-62 Survey number: HABS MD-818
Middle Creek Hydroelectric Dam, On Middle Creek, West of U.S. Route 15...
Significance: The Middle Creek Hydroelectric Dam is a significant example of a timber crib dam and small electric generating station, that is typical of early rural electrification in America. Locally it was a... More
Middle Creek Hydroelectric Dam, On Middle Creek, West of U.S. Route 15...
Significance: The Middle Creek Hydroelectric Dam is a significant example of a timber crib dam and small electric generating station, that is typical of early rural electrification in America. Locally it was a... More
Crow Canyon Pueblito, Approximately 1.2 miles south of Largo Canyon Wa...
Significance: The Pueblo Revolt of 1680 and the subsequent Spanish reconquest of 1692 forced many Pueblo tribes to flee westward and seek temporary refuge with the Navajo. The Crow Canyon site is an excellent ... More
Sublet Mine No. 6, East of County Road No. 306, 3 miles north of U.S. ...
Significance: This site contains distinctive remnants of the coal mine that represent the broader state and regional historic themes of mining and ethnicity. In its technology and operation and in its workforc... More
Great Smoky Mountains National Park Roads & Bridges, The Loop Over Bri...
Significance: The Loop Over Bridge is a significant component of the transportation system in Great Smoky Mountains National Park. Providing access to the first national park in the southern portion of the Uni... More
Joyce Estate, B. C. Cabin, Chippewa National Forest Road 2144, 3 miles...
Significance: ... this cabin was built soon after completion of the Main Cabin and the first three sleeping cabins. It is apparently one of the seven "cottages" mentioned in an article about the estate in the ... More
Red Bridge, Spanning Yellow river at abandoned county road, 7.3 miles ...
Significance: The Red Bridge is a 98' combination wood and iron Pratt through truss, the remaining example in Iowa of an uncovered timber truss, with only a few remaining in other parts of the United States. U... More
Chesapeake & Ohio Canal, Paw-Paw Tunnel, 155.2 - 155.8 miles above tid...
See HABS No. DC-147 for list of other C&O Canal structures. Survey number: HABS MD-810
Sublet Mine No. 6, Engine House, Southeast side of Willow Creek Valley...
Survey number: HAER WY-54-E Public domain image related to President Abraham Lincoln, gelatin silver print, free to use, no copyright restrictions image - Picryl description
Chesapeake & Ohio Canal, Monocacy Aqueduct, 42.2 Miles above Tidewater...
Unprocessed Field note material exists for this structure: FN-25 Survey number: HABS MD-19 Building/structure dates: 1833 Initial Construction
Chesapeake & Ohio Canal, Monocacy Aqueduct, 42.2 Miles above Tidewater...
Unprocessed Field note material exists for this structure: FN-25 Survey number: HABS MD-19 Building/structure dates: 1833 Initial Construction
Chesapeake & Ohio Canal, Monocacy Aqueduct, 42.2 Miles above Tidewater...
Unprocessed Field note material exists for this structure: FN-25 Survey number: HABS MD-19 Building/structure dates: 1833 Initial Construction
Chesapeake & Ohio Canal, Monocacy Aqueduct, 42.2 Miles above Tidewater...
Unprocessed Field note material exists for this structure: FN-25 Survey number: HABS MD-19 Building/structure dates: 1833 Initial Construction
Samuel Probst Farm, Summer Kitchen, Farrandsville Road, approximately ...
Photo caption pages include a site plan & written data includes floor plans. Significance: As a domestic outbuilding constructed ca. 1916, this summer kitchen contributes to the character of the Samuel Probst F... More
Cape Neddick Light Station, End of Nubble Road, 1.1 miles east of U.S....
Survey number: HABS ME-192 Public domain photograph of wooden church building, free to use, no copyright restrictions image - Picryl description
A. F. Combs House, West side of State Highway (F.M) 2152, 1.75 miles n...
Significance: The A. F. Combs (Moore) House has been determined eligible for listing in the National Register of Historic Places as an excellent local example of a rural vernacular, central-hall dwelling that h... More
Rose Hill Plantation House, 2.5 miles Northwest of intersection of U.S...
Significance: Exceptional example of antebellum Gothic Revival residential architecture. Believed to have been constructed for Dr. John Kirk and his wife Carolina c. 1858-60. Remained unfinished until c. 1946. ... More
Rose Hill Plantation House, 2.5 miles Northwest of intersection of U.S...
Significance: Exceptional example of antebellum Gothic Revival residential architecture. Believed to have been constructed for Dr. John Kirk and his wife Carolina c. 1858-60. Remained unfinished until c. 1946. ... More
Rose Hill Plantation House, 2.5 miles Northwest of intersection of U.S...
Significance: Exceptional example of antebellum Gothic Revival residential architecture. Believed to have been constructed for Dr. John Kirk and his wife Carolina c. 1858-60. Remained unfinished until c. 1946. ... More
Bird-Husbands House, South side of Rockland Road, .3 miles northwest o...
Significance: The Bird-Husbands House is representative of nineteenth century vernacular farm house design in Brandywine Hundred, New Castle County, Delaware. Some of its characteristic features include clapbo... More
Dundee Canal Industrial Historic District, Beginning at George Street ...
Significance: The Dundee Canal Industrial Historic District (DCIHD) is an approximately 1.2-mile-long swath of late-19th- and early-20th-century industrial and industrial-related resources that cuts through the... More
Dundee Canal Industrial Historic District, Beginning at George Street ...
Significance: The Dundee Canal Industrial Historic District (DCIHD) is an approximately 1.2-mile-long swath of late-19th- and early-20th-century industrial and industrial-related resources that cuts through the... More
Dundee Canal Industrial Historic District, Beginning at George Street ...
Significance: The Dundee Canal Industrial Historic District (DCIHD) is an approximately 1.2-mile-long swath of late-19th- and early-20th-century industrial and industrial-related resources that cuts through the... More
Dundee Canal Industrial Historic District, Beginning at George Street ...
Significance: The Dundee Canal Industrial Historic District (DCIHD) is an approximately 1.2-mile-long swath of late-19th- and early-20th-century industrial and industrial-related resources that cuts through the... More
Dundee Canal Industrial Historic District, Beginning at George Street ...
Significance: The Dundee Canal Industrial Historic District (DCIHD) is an approximately 1.2-mile-long swath of late-19th- and early-20th-century industrial and industrial-related resources that cuts through the... More
Dundee Canal Industrial Historic District, Beginning at George Street ...
Significance: The Dundee Canal Industrial Historic District (DCIHD) is an approximately 1.2-mile-long swath of late-19th- and early-20th-century industrial and industrial-related resources that cuts through the... More
Catawissa Bridge, Spanning north branch of Susquehanna River, 3.5 mile...
Significance: The existing Catawissa Bridge, built in 1898 by the Pennsylvania Bridge Company of Beaver Falls, Pennsylvania, consists of four (4) steel through-truss spans, each 304 feet long, for a total lengt... More
Catawissa Bridge, Spanning north branch of Susquehanna River, 3.5 mile...
Significance: The existing Catawissa Bridge, built in 1898 by the Pennsylvania Bridge Company of Beaver Falls, Pennsylvania, consists of four (4) steel through-truss spans, each 304 feet long, for a total lengt... More
Catawissa Bridge, Spanning north branch of Susquehanna River, 3.5 mile...
Significance: The existing Catawissa Bridge, built in 1898 by the Pennsylvania Bridge Company of Beaver Falls, Pennsylvania, consists of four (4) steel through-truss spans, each 304 feet long, for a total lengt... More
Catawissa Bridge, Spanning north branch of Susquehanna River, 3.5 mile...
Significance: The existing Catawissa Bridge, built in 1898 by the Pennsylvania Bridge Company of Beaver Falls, Pennsylvania, consists of four (4) steel through-truss spans, each 304 feet long, for a total lengt... More
High Mountain Dams in Upalco Unit, East Timothy Lake Dam, Ashley Natio...
Significance: With a crest length of almost 1,400 feet, the East Timothy Lake dam is distinguished as by far the largest dam in the Upalco Unit of the Central Utah Project. It was completed in 1951 as the last... More
Fort Totten, Captain & First Lieutenant's Quarters, Building No. 2, 12...
Survey number: HABS ND-23 Public domain photograph of historic place in Washington DC, free to use, no copyright restrictions image - Picryl description
East Broad Top Railroad & Company, Water Tank at Coles Station, East B...
Unprocessed Field note material exists for this structure: N1150 Survey number: HAER PA-644 Building/structure dates: 1919 Initial Construction
Geraldine Lucas Homestead, Russell Lucas Cabin, West bank Cottonwood C...
Survey number: HABS WY-113-B Building/structure dates: 1925- 1930 Initial Construction
Chesapeake & Ohio Canal, Stop Lock at Dam No. 4, 85.62 miles above tid...
Significance: The Stop Lock at Dam Number Four served to prevent back flooding of the canal above the dam during periods of high water and also served to prevent the loss of water from the canal during emergenc... More