The McCrory Waterworks is a historic site located in McCrory, Arkansas.
 It contains an elevated steel water tower, built in 1936 by the Chicago Bridge & Iron Company in conjunction with the Public Works Administration, which provided $39,497 in aid for the construction of the waterworks, which included the water tower, tank, and water shed.
 The site was added to the National Register of Historic Places in 2007, as part of a multiple-property listing that included numerous other New Deal-era projects throughout Arkansas.
The Hampton Waterworks is a historic site located in Hampton, Arkansas.
 Completed in 1937, it is the only surviving example of a PWA-built waterworks in Calhoun County.
 The site contains a good example of a 1930s-era elevated steel water tower, built by the Pittsburgh-Des Moines Steel Company.
 The site was added to the National Register of Historic Places in 2006.
The Cotter water tower is a historic elevated steel water tower located in Cotter, Arkansas.
 It was constructed in 1935 by the Pittsburgh-Des Moines Steel Company, as part of the development of the local water supply system by the Public Works Administration.
 The tower was added to the National Register of Historic Places in 2007, as part of a multiple-property listing that included numerous other PWA-era projects in Arkansas, under the heading “An Ambition to Be Preferred: New Deal Recovery Efforts and Architecture in Arkansas, 1933-1943.”
The De Valls Bluff Waterworks is a historic public water supply facility at Rumbaugh and Hazel Streets in De Valls Bluff, Arkansas.
 It contains a 1930s-era elevated steel water tower, built in 1936 by the Pittsburgh-Des Moines Steel Company in conjunction with the Public Works Administration as part of a project to improve the local water supply.
 It was added to the National Register of Historic Places in 2007, as part of a multiple-property listing that included numerous other New Deal-era projects throughout Arkansas.
 The property also contains several non-contributing buildings, including a shed building, aeration chamber and water tank.
The Cotton Plant water tower is a historic elevated steel water tower located in Cotton Plant, Arkansas.
 It was built in 1935 by the Pittsburgh-Des Moines Steel Company in conjunction with the Public Works Administration as part of a project to improve the area's water supply.
 It was added to the National Register of Historic Places in 2008, as part of a multiple-property listing that included numerous other New Deal-era projects throughout Arkansas.
The Tyronza Water Tower is a historic elevated steel water tower located in Tyronza, Arkansas.
 It was built in 1935 by the Chicago Bridge & Iron Company in conjunction with the Public Works Administration as part of a project to improve the local water supply.
 It was added to the National Register of Historic Places in 2007, as part of a multiple-property listing that included numerous other New Deal-era projects throughout Arkansas.
 The Tyronza Water Tower is considered an excellent representation of 1930s-era waterworks construction.
The Mineral Springs Waterworks is a historic site located in Mineral Springs, Arkansas.
 It contains a good example of a 1930s-era elevated steel water tower, built in 1936 by the Pittsburgh-Des Moines Steel Company in conjunction with the Public Works Administration as part of a project to improve the town's water supply.
 The tower was built to store water obtained from a nearby well.
 It was added to the National Register of Historic Places in 2007, as part of a multiple-property listing that included numerous other New Deal-era projects throughout Arkansas.
 A new water well was drilled nearby in 1985; however, the original water tower still stands.
 The Mineral Springs Waterworks remains in operation.
The Waldo water tower is a historic elevated steel water tower located in Waldo, Arkansas.
 It was completed in 1936 by the Pittsburgh-Des Moines Steel Company in conjunction with the Public Works Administration as part of a project to improve the town's water supply.
 It was added to the National Register of Historic Places in 2007, as part of a multiple-property listing that included numerous other New Deal-era projects throughout Arkansas.
 The tower is still in operation as part of the town's water supply system.
CB&I is a large engineering, procurement and construction (EPC) company with its administrative headquarters in The Woodlands, Texas.
 CB&I specializes in projects for oil and gas companies.
 According to one of the founder's heirs, "The old joke is that Chicago Bridge & Iron isn't in Chicago, doesn't build bridges and doesn't use iron."
 CB&I employs more than 32,000 people worldwide.
The Monette Water Tower is a historic elevated steel water tower located in Hartford, Arkansas.
 It was built in 1936 by the Chicago Bridge & Iron Company in conjunction with the Public Works Administration as part of a project to improve the local water supply.
 The project was one of 124 similar projects in the state funded by the PWA.
 It was added to the National Register of Historic Places in 2008, as part of a multiple-property listing that included numerous other New Deal-era projects throughout Arkansas.

Question: The McCrory Waterworks is a historic site that contains an elevated steel water tower built by a company that specializes in projects for who?
Answer: oil and gas companies