Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
Washington Monument, High ground West of Fifteenth Street, Northwest, ...
See also HAER DC-5 for additional documentation. Significance: Built to commemorate the first president of the United States, the monument has also become a hallowed symbol of the nation's government and the ci... More
MacDill Air Force Base, Administration Building, 2416 Florida Keys Ave...
Significance: The Administration Building, due to its architectural integrity and its contribution to the Second World War-era infrastructure, is an integral part of MacDill Air Force Base's historic character.... More
Cape Canaveral Air Station, Launch Complex 17, Facility 28421, East en...
Survey number: HAER FL-8-5-Y Building/structure dates: 1956 Initial Construction National Register of Historic Places NRIS Number: 84003872
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau,...
Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With roots in the Progressive Era, the project was adopted by New Deal prop... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau,...
Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With roots in the Progressive Era, the project was adopted by New Deal prop... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau,...
Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With roots in the Progressive Era, the project was adopted by New Deal prop... More
Cape Canaveral Air Station, Launch Complex 17, Facility 28401, East en...
Survey number: HAER FL-8-5-A Building/structure dates: 1956 Initial Construction National Register of Historic Places NRIS Number: 84003872
Cape Canaveral Air Station, Launch Complex 17, Facility 28401, East en...
Survey number: HAER FL-8-5-A Building/structure dates: 1956 Initial Construction National Register of Historic Places NRIS Number: 84003872
Cape Canaveral Air Station, Launch Complex 17, Facility 28401, East en...
Survey number: HAER FL-8-5-A Building/structure dates: 1956 Initial Construction National Register of Historic Places NRIS Number: 84003872
Cape Canaveral Air Station, Launch Complex 17, Facility 28401, East en...
Survey number: HAER FL-8-5-A Building/structure dates: 1956 Initial Construction National Register of Historic Places NRIS Number: 84003872
MacDill Air Force Base, Photographic Laboratory, 7718 Hanger Loop Driv...
Significance: The Photographic Laboratory, due to its architectural integrity and its contribution to the Second World War-era infrastructure, forms an integral part of MacDill Air Force Base's historic charact... More
MacDill Air Force Base, Quartermaster Gas & Oil House, 8103 Hanger Loo...
Significance: The Quartermaster Gas & Oil House, due to its architectural integrity and its contribution to the Second World War-era infrastructure, is an integral part of MacDill Air Force Base's historic char... More
Wright-Patterson Air Force Base, Area B, Building 28, Aircraft Radio L...
Significance: Built during World War II as an expansion of the Army Air Force's Aircraft Radio Laboratory at Wright Field, Building 28 hosted early research that led to the development of modern electronic coun... More
Wright-Patterson Air Force Base, Area B, Building 28, Aircraft Radio L...
Significance: Built during World War II as an expansion of the Army Air Force's Aircraft Radio Laboratory at Wright Field, Building 28 hosted early research that led to the development of modern electronic coun... More
Arlington Memorial Bridge, Spanning Potomac River between Lincoln Memo...
Significance: As the final link in the chain of monuments which start at the Capitol building, the Arlington Memorial Bridge connects the Mall in Washington, DC with Arlington National Cemetery in Virginia. De... More
Ellsworth Air Force Base, Administration Office, 2704 George Drive, Bl...
Significance: The Administration Office (Building No. 4612) was one of a small number of buildings completed at the base in 1943; these buildings matched the base's 1942 buildings in style and construction. Thi... More
Waterways Experiment Station, Hydraulics Laboratory, Halls Ferry Road,...
Significance: Established in response to a campaign to create a national hydraulics laboratory during the 1920s, the Waterways Experiment Station's activities include the resolution of hydraulic problems in wat... More
Waterways Experiment Station, Hydraulics Laboratory, Halls Ferry Road,...
Significance: Established in response to a campaign to create a national hydraulics laboratory during the 1920s, the Waterways Experiment Station's activities include the resolution of hydraulic problems in wat... More
Waterways Experiment Station, Hydraulics Laboratory, Halls Ferry Road,...
Significance: Established in response to a campaign to create a national hydraulics laboratory during the 1920s, the Waterways Experiment Station's activities include the resolution of hydraulic problems in wat... More
Waterways Experiment Station, Hydraulics Laboratory, Halls Ferry Road,...
Significance: Established in response to a campaign to create a national hydraulics laboratory during the 1920s, the Waterways Experiment Station's activities include the resolution of hydraulic problems in wat... More
MacDill Air Force Base, Double Non-Commissioned Officers' Quarters, 74...
Significance: The Non-Commissioned Officers Quarters, due to their architectural integrity and their contribution to the Second World War-era infrastructure, are an integral part of MacDill Air Force Base's his... More
MacDill Air Force Base, Fire & Guard House, 2709 Florida Keys Avenue, ...
Significance: The Fire and Guard House, due to its architectural integrity and its contribution to the Second World War-era infrastructure, forms an integral part of MacDill Air Force Base's historic character.... More
MacDill Air Force Base, Quartermaster Warehouse & Commissary, 7621 Hil...
Significance: The Quartermaster Commissary, due to its architectural integrity and its contribution to the Second World War-era infrastructure, is an integral part of MacDill Air Force Base's historic character... More
MacDill Air Force Base, Quartermaster Warehouse & Commissary, 7621 Hil...
Significance: The Quartermaster Commissary, due to its architectural integrity and its contribution to the Second World War-era infrastructure, is an integral part of MacDill Air Force Base's historic character... More
Eglin Air Force Base, Hangar No. 1, 505 Choctawhatchee Avenue, Valpara...
Significance: As one of the original buildings constructed at Eglin Air Force Base, HANGAR 1 (Building No. 66) has played a crucial role during the World War II, Korean War, Cold War, and post Cold War eras. T... More
Milkhouse Ford, Washington, District of Columbia, DC
Significance: The only operable creek crossing in Rock Creek Park, Milkhouse Ford survives as a reminder of the days when fords were plentiful in the area, and were the only means of traversing the creek. Regu... More
Glacier Point Road, Between Chinquapin Flat & Glacier Point, Yosemite ...
Significance: The Glacier Point Road is a scenic drive providing access to Yosemite's most popular overlook. The road was opened as a toll wagon road in the 1870s, and reconstructed as a modern highway in the ... More
Hans Ehlers Farm, Barn, F Street, Papillon 18 Damsite, Millard, Dougla...
Unprocessed Field note material exists for this structure: FN-40 Survey number: HABS NE-42-B
Crawfish Creek Bridge, Spanning Crawfish Creek at South Entrance Road,...
Significance: Crawfish Creek Bridge typifies the early design philosophy of the National Park Service, which was to use indigenous materials to harmonize manmade features with their natural surroundings. This ... More
Cape Canaveral Air Station, Launch Complex 17, Facility 28405, East en...
Survey number: HAER FL-8-5-O Building/structure dates: 1956 Initial Construction National Register of Historic Places NRIS Number: 84003872
Upper Mississippi River Nine-Foot Channel Project, Lock & Dam No. 24, ...
Significance: The Upper Mississippi River Nine-Foot Channel Project represents one of the largest and most ambitious river improvement projects ever constructed in the United States. The project's origins date... More
Ellsworth Air Force Base, Well House No. 3, Menoher Road, Blackhawk, M...
This structure was demolished in 1996. Significance: The 1959 Well House No. 3 is a replacement, constructed on the foundation of a small wood-frame well house buildings constructed in 1943 (during World War II... More
MacDill Air Force Base, Parachute Building, 2700 Eagle Staff Court, Ta...
Significance: The Parachute Building, due to its architectural integrity and its contribution to the Second World War-era infrastructure, is an integral part of the MacDill Air Force Base's historic character. ... More
Golden Gate Viaduct, Spanning a ravine at Grand Loop Road, Kingman Pas...
Significance: The present Golden Gate Viaduct occupies the location of several historic viaducts. The original structure at Golden Gate was built in 1885 by the U.S. Army Corps of Engineers, which was responsi... More
MacDill Air Force Base, Base Theater, 2420 Florida Keys Avenue, Tampa,...
Significance: The Base Theater, due to its architectural integrity and its contribution to the Second World War-era infrastructure, is an integral part of MacDill Air Force Base's historic character. The build... More
Prado Dam, Outlet Works, Santa Ana River near junction of State Highwa...
Significance: The construction of Prado Dam was a significant event in the history of flood control in southern California and specifically Orange County. The Dam has played a vital role in the economies and d... More
St. Mary's Falls Canal, Soo Locks, Davis Lock Subcomplex, Southwest In...
Significance: The Davis Lock's Southwest Intermediate Shelter is significant as an element that contributes to the overall integrity of the Soo Lock complex in general. The shelter is also a unique component t... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 8, On Mississip...
See HAER MN-20, Upper Mississippi River Nine-Foot Channel Project History, Locks and Dams 3-10, for additional information. Significance: The Upper Mississippi River Lock and Dam Project represents one of the l... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 8, On Mississip...
See HAER MN-20, Upper Mississippi River Nine-Foot Channel Project History, Locks and Dams 3-10, for additional information. Significance: The Upper Mississippi River Lock and Dam Project represents one of the l... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 8, On Mississip...
See HAER MN-20, Upper Mississippi River Nine-Foot Channel Project History, Locks and Dams 3-10, for additional information. Significance: The Upper Mississippi River Lock and Dam Project represents one of the l... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 8, On Mississip...
See HAER MN-20, Upper Mississippi River Nine-Foot Channel Project History, Locks and Dams 3-10, for additional information. Significance: The Upper Mississippi River Lock and Dam Project represents one of the l... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam 26, Alton, ...
Significance: The Upper Mississippi River Nine-Foot Channel Project represents one of the largest and most ambitious river improvement projects ever constructed in the United States. The project's origins date... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam 26, Alton, ...
Significance: The Upper Mississippi River Nine-Foot Channel Project represents one of the largest and most ambitious river improvement projects ever constructed in the United States. The project's origins date... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam 26, Alton, ...
Significance: The Upper Mississippi River Nine-Foot Channel Project represents one of the largest and most ambitious river improvement projects ever constructed in the United States. The project's origins date... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam 26, Alton, ...
Significance: The Upper Mississippi River Nine-Foot Channel Project represents one of the largest and most ambitious river improvement projects ever constructed in the United States. The project's origins date... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam 26, Alton, ...
Significance: The Upper Mississippi River Nine-Foot Channel Project represents one of the largest and most ambitious river improvement projects ever constructed in the United States. The project's origins date... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam 26, Alton, ...
Significance: The Upper Mississippi River Nine-Foot Channel Project represents one of the largest and most ambitious river improvement projects ever constructed in the United States. The project's origins date... More
Mississippi River 9-Foot Channel, Lock & Dam No. 19, Upper Mississippi...
Significance: Rare, intact example of nationally significant historic engineering listed on the National Register of Historic Places as part of the Lock 19 National Register District. The U.S. Army Corps of ... More
Mississippi River 9-Foot Channel, Lock & Dam No. 19, Upper Mississippi...
Significance: Rare, intact example of nationally significant historic engineering listed on the National Register of Historic Places as part of the Lock 19 National Register District. The U.S. Army Corps of ... More
Mississippi River 9-Foot Channel, Lock & Dam No. 19, Upper Mississippi...
Significance: Rare, intact example of nationally significant historic engineering listed on the National Register of Historic Places as part of the Lock 19 National Register District. The U.S. Army Corps of ... More
Mississippi River 9-Foot Channel, Lock & Dam No. 19, Upper Mississippi...
Significance: Rare, intact example of nationally significant historic engineering listed on the National Register of Historic Places as part of the Lock 19 National Register District. The U.S. Army Corps of ... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam 27, Granite...
Significance: ...Lock and Dam No. 27 constitute additions to the original Upper Mississippi Nine-Foot Channel Project, constructed after World War II. Lock No. 27, located on the Chain of Rocks Canal, provided... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam 27, Granite...
Significance: ...Lock and Dam No. 27 constitute additions to the original Upper Mississippi Nine-Foot Channel Project, constructed after World War II. Lock No. 27, located on the Chain of Rocks Canal, provided... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam 27, Granite...
Significance: ...Lock and Dam No. 27 constitute additions to the original Upper Mississippi Nine-Foot Channel Project, constructed after World War II. Lock No. 27, located on the Chain of Rocks Canal, provided... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam 27, Granite...
Significance: ...Lock and Dam No. 27 constitute additions to the original Upper Mississippi Nine-Foot Channel Project, constructed after World War II. Lock No. 27, located on the Chain of Rocks Canal, provided... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam 27, Granite...
Significance: ...Lock and Dam No. 27 constitute additions to the original Upper Mississippi Nine-Foot Channel Project, constructed after World War II. Lock No. 27, located on the Chain of Rocks Canal, provided... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam 27, Granite...
Significance: ...Lock and Dam No. 27 constitute additions to the original Upper Mississippi Nine-Foot Channel Project, constructed after World War II. Lock No. 27, located on the Chain of Rocks Canal, provided... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam 27, Granite...
Significance: ...Lock and Dam No. 27 constitute additions to the original Upper Mississippi Nine-Foot Channel Project, constructed after World War II. Lock No. 27, located on the Chain of Rocks Canal, provided... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 4, Alma, Buffal...
Significance: This lock and dam was the first constructed as part of the Upper Mississippi River Nine-Foot Channel Project. It contains the standard items on most of the lock and dam structures in this project... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 4, Alma, Buffal...
Significance: This lock and dam was the first constructed as part of the Upper Mississippi River Nine-Foot Channel Project. It contains the standard items on most of the lock and dam structures in this project... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 4, Alma, Buffal...
Significance: This lock and dam was the first constructed as part of the Upper Mississippi River Nine-Foot Channel Project. It contains the standard items on most of the lock and dam structures in this project... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 4, Alma, Buffal...
Significance: This lock and dam was the first constructed as part of the Upper Mississippi River Nine-Foot Channel Project. It contains the standard items on most of the lock and dam structures in this project... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 4, Alma, Buffal...
Significance: This lock and dam was the first constructed as part of the Upper Mississippi River Nine-Foot Channel Project. It contains the standard items on most of the lock and dam structures in this project... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 4, Alma, Buffal...
Significance: This lock and dam was the first constructed as part of the Upper Mississippi River Nine-Foot Channel Project. It contains the standard items on most of the lock and dam structures in this project... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 4, Alma, Buffal...
Significance: This lock and dam was the first constructed as part of the Upper Mississippi River Nine-Foot Channel Project. It contains the standard items on most of the lock and dam structures in this project... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 4, Alma, Buffal...
Significance: This lock and dam was the first constructed as part of the Upper Mississippi River Nine-Foot Channel Project. It contains the standard items on most of the lock and dam structures in this project... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 4, Alma, Buffal...
Significance: This lock and dam was the first constructed as part of the Upper Mississippi River Nine-Foot Channel Project. It contains the standard items on most of the lock and dam structures in this project... More
Cape Canaveral Air Station, Launch Complex 17, Facility 28501, East en...
Survey number: HAER FL-8-5-B Building/structure dates: 1956 Initial Construction National Register of Historic Places NRIS Number: 84003872
Cape Canaveral Air Station, Launch Complex 17, Facility 28501, East en...
Survey number: HAER FL-8-5-B Building/structure dates: 1956 Initial Construction National Register of Historic Places NRIS Number: 84003872
Cape Canaveral Air Station, Launch Complex 17, Facility 28501, East en...
Survey number: HAER FL-8-5-B Building/structure dates: 1956 Initial Construction National Register of Historic Places NRIS Number: 84003872
Dredge CINCINNATI, Docked on Ohio River at foot of Lighthill Street, P...
Significance: The Cincinnati is a "dipper dredge," particularly suited to the shallow, rocky conditions of American inland waterways. The dredge operated for 78 years on the Ohio River and its tributaries. Th... More
Dredge CINCINNATI, Docked on Ohio River at foot of Lighthill Street, P...
Significance: The Cincinnati is a "dipper dredge," particularly suited to the shallow, rocky conditions of American inland waterways. The dredge operated for 78 years on the Ohio River and its tributaries. Th... More
Dredge CINCINNATI, Docked on Ohio River at foot of Lighthill Street, P...
Significance: The Cincinnati is a "dipper dredge," particularly suited to the shallow, rocky conditions of American inland waterways. The dredge operated for 78 years on the Ohio River and its tributaries. Th... More
Blossom Point Farm, La Plata, Charles County, MD
Significance: Although architecturally simple in design, the Ballast House contains exceptionally fine, attractive 18th century style interior woodwork in remarkably good condition. The original kitchen, once ... More
Blossom Point Farm, La Plata, Charles County, MD
Significance: Although architecturally simple in design, the Ballast House contains exceptionally fine, attractive 18th century style interior woodwork in remarkably good condition. The original kitchen, once ... More
Blossom Point Farm, La Plata, Charles County, MD
Significance: Although architecturally simple in design, the Ballast House contains exceptionally fine, attractive 18th century style interior woodwork in remarkably good condition. The original kitchen, once ... More
Blossom Point Farm, La Plata, Charles County, MD
Significance: Although architecturally simple in design, the Ballast House contains exceptionally fine, attractive 18th century style interior woodwork in remarkably good condition. The original kitchen, once ... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 9, Lynxville, C...
See HAER MN-20, Upper Mississippi River Nine-Foot Channel Project History, Locks and Dams 3-10, for additional information. Significance: The Upper Mississippi River Lock and Dam Project represents one of the l... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 9, Lynxville, C...
See HAER MN-20, Upper Mississippi River Nine-Foot Channel Project History, Locks and Dams 3-10, for additional information. Significance: The Upper Mississippi River Lock and Dam Project represents one of the l... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 9, Lynxville, C...
See HAER MN-20, Upper Mississippi River Nine-Foot Channel Project History, Locks and Dams 3-10, for additional information. Significance: The Upper Mississippi River Lock and Dam Project represents one of the l... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 9, Lynxville, C...
See HAER MN-20, Upper Mississippi River Nine-Foot Channel Project History, Locks and Dams 3-10, for additional information. Significance: The Upper Mississippi River Lock and Dam Project represents one of the l... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 9, Lynxville, C...
See HAER MN-20, Upper Mississippi River Nine-Foot Channel Project History, Locks and Dams 3-10, for additional information. Significance: The Upper Mississippi River Lock and Dam Project represents one of the l... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 9, Lynxville, C...
See HAER MN-20, Upper Mississippi River Nine-Foot Channel Project History, Locks and Dams 3-10, for additional information. Significance: The Upper Mississippi River Lock and Dam Project represents one of the l... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 9, Lynxville, C...
See HAER MN-20, Upper Mississippi River Nine-Foot Channel Project History, Locks and Dams 3-10, for additional information. Significance: The Upper Mississippi River Lock and Dam Project represents one of the l... More