Wednesday, December 27, 2017

NYC water supply: Croton Dam and Spillway Bridge

(Bridge Hunter, no Historic Bridges, HAER; B&T; see below for satellite information)

There is also a Croton Dam in Michigan.
This is another example of a dam using a tumble bay in its emergency spillway.
The 1894 pin-connected Quaker Road Bridge is just a little downstream from here.

According to Bridge Hunter comments, the 2005 bridge had to be rehabilitated in 2011. And then because of 9/11 arguments, it was closed to traffic. It is now for pedestrians and bikes.
3D Satellite
3D Satellite

Thomas Engel posted three photos with the comment:
The Croton Dam Spillway in New York State has had three, open spandrel steel arch bridges, 1905, 1976 and the current one shown in the first photo, 2005. Shortly before the construction of the latest, we did some inspection and evaluation of the 1976 version. The last step off that ladder is 200'.


Jeremy John Gibson Brown And the purpose of the ladder is?
Thomas Engel You get on the inspection scaffolding by going over the side on that ladder and taking a sideways step. The wire supported scaffold in visible in the second photo. The ladder was also used to enter the "spider" basket, as in the third photo.
Thomas Engel commented on his posting
The original span under construction. The rebuilding in 2005 was faithful to the initial concept.

1 of 5 photos posted by Bridges & Tunnels
The construction of the New Croton Dam in Westchester County, New York, necessitated the erection of two distinctive steel arch structures: a steel arch structure over the spillway and another over the Croton River. The spillway bridge was initially constructed by the Baltimore Bridge Company but was replaced in 1975 with a simpler arch design built of Corten steel due to deterioration resulting from exposure to roadway salt and spillway spray. Seismic capacity, deck-bearing details, and anchorage at the arch bases were among the design and structural issues that compounded the bridge’s deterioration, leading to its emergency closure in 2003 and replacement in 2005.
➤ Check out our latest Journal entry, "Croton Dam and Bridges," at

This is the New Croton Dam which was built between 1892 and 1906. It is not obvious that the Theodore Roosevelt Dam is a masonry dam. But you can easily see the cut stones in this masonry dam. The Old Croton Dam was completed in 1842.

As I suspected, it is part of the water supply complex for New York City.
At the time of its completion, it was the tallest dam in the world.[5] New Croton Dam impounds up to 19 billion US gallons (72,000,000 m3) of water, a small fraction of the New York City water system's total storage capacity of 580 billion US gallons (2.2×109 m3).[6][Wikipedia]

Cristian Opazo caught the spillway in use, License: Creative Commons Attribution-Share-Alike (CC BY-SA)

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