Allegheny River Lock and Dam No. 9 facts for kids
Quick facts for kids |
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Allegheny River Lock and Dam No. 9
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 Location in Pennsylvania
Location in the United States
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| Location | Terminus of PA 1004, 0.2 mi. N of T488, Madison Township, Pennsylvania and Washington Township, Pennsylvania |
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| Area | 59.5 acres (24.1 ha) |
| Built | 1935-1938 |
| Built by | York Engineering & Construction |
| Architectural style | Late 19th And 20th Century Revivals |
| MPS | Allegheny River Navigation System MPS |
| NRHP reference No. | 00000403 |
| Added to NRHP | April 21, 2000 |
The Allegheny River Lock and Dam No. 9 is an important historical structure. It is located in Madison Township and Washington Township, in Armstrong County, Pennsylvania. This complex includes a special water lock and a dam.
It was built between 1935 and 1938. The United States Army Corps of Engineers created it. This group helps manage many of America's waterways. The lock and dam were built to make it easier for boats to travel along the Allegheny River. In 2000, this important site was added to the National Register of Historic Places. This means it is a special place worth protecting.
What is a Lock and Dam?
A lock and dam system helps boats move safely on rivers. Rivers sometimes have different water levels. A dam holds back water to create a deeper section. This makes the river easier to navigate.
A lock is like a water elevator for boats. It lets boats move between different water levels. When a boat enters a lock, gates close behind it. Water is then either added or removed. This raises or lowers the boat to the new water level. Then, the gates open, and the boat can continue its journey.
Why Was This Lock and Dam Built?
The Allegheny River Lock and Dam No. 9 was part of a bigger plan. The U.S. Army Corps of Engineers built many locks and dams. Their goal was to improve navigation along the Allegheny River. This made it easier for boats to carry goods and people. It helped trade and travel in the region.
Key Features of the Lock and Dam
The Allegheny River Lock and Dam No. 9 has several important parts. These include the lock, the dam itself, and an Operations Building.
- The Lock: This part is 56 feet wide and 360 feet long. It can raise or lower boats by 22 feet. The lock uses strong steel gates called miter gates. These gates open and close to let boats in and out.
- The Dam: The dam is about 60 feet high. It stretches for 918 feet across the river. It is a "fixed-crest" dam. This means its top edge stays at a set height.
- Operations Building: This two-story building is where workers control the lock and dam. It was built in a simple, practical style. This style was common in the early 1900s.
