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2. Guard rail - Wikipedia

   en.wikipedia.org/wiki/Guard_rail

   An example of a common residential guard rail (US) handrail (Brit.) is a wood railing around a deck or patio. In the US this is typically built on-site from pressure treated lumber thus featuring a simplistic design of vertical baluster spaced every 3.5 inches (8.9 cm) demonstrating compliance with Building Codes (Standards).

3. Bollard - Wikipedia

   en.wikipedia.org/wiki/Bollard

   Bollards are used to protect buildings and people in public spaces from car ramming attacks [21] and accidental collisions. Related protections against deliberate attacks are wedge barriers and archer barriers. [22] The bollards are effective protection against deliberate attacks if properly deployed and maintained.

4. List of locks and dams of the Upper Mississippi River

   en.wikipedia.org/wiki/List_of_locks_and_dams_of...

   HAER No. MN-62, "Mississippi River 9-Foot Channel, Lock & Dam No. 1, Saint Paul, Ramsey County, MN", 30 photos, 47 data pages, 3 photo caption pages HAER No. IA-22, " Upper Mississippi River 9-Foot Channel, Lock & Dam No. 10, Guttenberg, Clayton County, IA ", 114 photos, 11 data pages, 8 photo caption pages

5. Lock and Dam No. 19 - Wikipedia

   en.wikipedia.org/wiki/Lock_and_Dam_No._19

   Lock and Dam No. 19 is a lock and dam located on the Upper Mississippi River near Keokuk, Iowa. In 1978, the Keokuk Lock and Dam was listed in the National Register of Historic Places , #78001234. In 2004, the facility was listed in the National Register of Historic Places as Lock and Dam No. 19 Historic District, #04000179 covering 1,605 acres ...

6. Permeable paving - Wikipedia

   en.wikipedia.org/wiki/Permeable_paving

   Permeable pavement is commonly used on roads, paths and parking lots subject to light vehicular traffic, such as cycle-paths, service or emergency access lanes, road and airport shoulders, and residential sidewalks and driveways.

7. Lock and Dam No. 20 - Wikipedia

   en.wikipedia.org/wiki/Lock_and_Dam_No._20

   Lock and Dam No. 20 is a lock and dam located on the Upper Mississippi River, the lock side in Canton, Missouri and the dam crossing to Meyer, Illinois. The structure is located at river mile 343.1. It includes a 2,369 feet (722 m) long dam, 40 tainter gates , 3 roller gates , and a lock chamber that is 110 feet (34 m) wide by 600 feet (183 m ...