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Ashokan Reservoir. Forms for concrete plug, 26 feet thick, in stream-control conduit in Olive Bridge dam. The 6-foot opening at bottom carries the flow of Esopus creek. Contract 3. August 25, 1913.

Ashokan Reservoir. Forms for concrete plug, 26 feet thick, in stream-c...

Public domain photograph of industrial architecture, factory building, free to use, no copyright restrictions image - Picryl description

Wallkill pressure tunnel. End view of section of concrete lining with invert laid in foreground. Erection forms in progress in background. Contract 47. April 11, 1911.

Wallkill pressure tunnel. End view of section of concrete lining with...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Ashokan Reservoir. View showing concrete core-wall of West dike with wooden forms in place. Placing and rolling embankment at right. Contract 3. June 21, 1910.

Ashokan Reservoir. View showing concrete core-wall of West dike with w...

Public domain photograph of construction site, free to use, no copyright restrictions image - Picryl description

Yonkers pressure tunnel. One type of steel forms for lining tunnel. ... Contract 54. November 15, 191.

Yonkers pressure tunnel. One type of steel forms for lining tunnel. ....

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Wallkill pressure tunnel. View showing full-section steel forms in place. The concrete is placed in one operation. Contract 47. June 8, 1911.

Wallkill pressure tunnel. View showing full-section steel forms in pla...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Bonticou tunnel. Erecting steel area arch forms for concreting. .. Contract 47. April 12, 1911.

Bonticou tunnel. Erecting steel area arch forms for concreting. .. Con...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Rondout pressure tunnel. View looking up incline to platform from which concrete is shoveled into arch forms. Contract 12. October 10, 1910.

Rondout pressure tunnel. View looking up incline to platform from whic...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Kensico reservoir. Valves and piping and concrete forms for blow-off in the Lower gate-chamber beneath the Terrace of Kensico dam. Contract 9. March 30, 1914.

Kensico reservoir. Valves and piping and concrete forms for blow-off i...

Picryl description: Public domain image of a construction site, industrial or commercial building, free to use, no copyright restrictions.

Wallkill pressure tunnel. Side-wall and arch forms in place ready for concrete, with inclined track to platform on level with top of side-wall. Contract 47. April 11, 1911.

Wallkill pressure tunnel. Side-wall and arch forms in place ready for ...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Wallkill South cut-and-cover. Inside steel forms in place with outside forms not set. Contract 15. May 23, 1910.

Wallkill South cut-and-cover. Inside steel forms in place with outside...

Public domain image of an arch structure, bridge, historic place ruins, classical architecture, free to use, no copyright restrictions - Picryl description

Rondout pressure tunnel. Steel arch forms mounted on traveler with plates removed to permit placing of concrete in haunches. Contract 12. October 10, 1910.

Rondout pressure tunnel. Steel arch forms mounted on traveler with pla...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Wallkill pressure tunnel. View of steel arch forms and concrete platform. ... Contract 47. June 7, 1911.

Wallkill pressure tunnel. View of steel arch forms and concrete platfo...

Picryl description: Public domain image of a chamber, cell, interior, underground vault architecture, free to use, no copyright restrictions.

Eastview tunnel. View showing forms in place with completed arch and side-wall in foreground. ... Contract 52. april 25, 1912.

Eastview tunnel. View showing forms in place with completed arch and s...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Yonkers pressure tunnel. Steel ribs for concrete forms, made up of 5-inch I-beams spaced 3 feet apart. Lagging plates placed as concrete is built up from the invert. Contract 54. May 1, 1912.

Yonkers pressure tunnel. Steel ribs for concrete forms, made up of 5-i...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Mekeel tunnel. View showing steel forms in place for concrete lining. Contract 2. June 27, 1911.

Mekeel tunnel. View showing steel forms in place for concrete lining. ...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Ashokan Reservoir. Dumping earth from cableway for embankment of the West dike. Core-wall with concrete forms in background. Contract 3. October 11, 1910.

Ashokan Reservoir. Dumping earth from cableway for embankment of the W...

Public domain photograph of electric wires, power line, free to use, no copyright restrictions image - Picryl description

Wallkill pressure tunnel. View showing details of steel forms for concrete lining of pressure tunnels. Contract 47. October 5, 1910.

Wallkill pressure tunnel. View showing details of steel forms for conc...

Public domain photograph of the train tunnel, railroad, train track, free to use, no copyright restrictions image - Picryl description

Ashokan Reservoir. View of up-stream face of Olive Bridge dam showing forms for concreting stream-flow opening in place. Note 6-foot opening at bottom for carrying flow of Esopus creek. Contract 3. August 25, 1913.

Ashokan Reservoir. View of up-stream face of Olive Bridge dam showing ...

Public domain photograph of industrial architecture, factory building, free to use, no copyright restrictions image - Picryl description