The 1929 Lake Champlain Bridge

The 1929 Lake Champlain Bridge (HM226O)

Location: Port Henry, NY 12974 Essex County
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Country: United States of America
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N 44° 2.597', W 73° 27.462'

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Inscription
Charles M. Spofford, an engineer of the Boston firm Fay, Spofford & Thorndike, designed the 1929 Lake Champlain Bridge. It was the first American highway bridge to employ a continuous truss design to create a curving transition between the deck approach spans on either side of the lake and the arched through span over the lake's navigation channel. The Lake Champlain Bridge set a precedent for the design of continuous truss bridges in the decades that followed. In 2009, Spofford's engineering innovations were recognized when the Lake Champlain Bridge was listed on the National Register of Historic Places.
Learning From The Past
The concrete mix used to construct the piers of the 1929 bridge contained approximately 20,000 tons of material consisting of iron ore tailings and crushed ore from the Witherbee Sherman Company mines, transported from Mineville, New York, on the Lake Champlain and Moriah Railroad roughly nine miles away. Spofford's research indicated that the tailings increased the strength of the concrete. The durable mix and its underwater performance persuaded him that reinforcing the piers with steel or armoring them with granite was unnecessary. In 1929, and still today, lake bridges were very rare, so the shearing forces of lake ice were still unknown and untested.
Years later, in 2009, when
surface deterioration and cracking were identified in the piers, the bridge was demolished because of safety concerns. Engineers designing the 2011 bridge learned from the 1929 structure, reinforcing the piers of the new bridge with steel and armoring them with granite to protect them against the thermal expansion of the lake's ice sheet.
[Photo captions, from top to bottom, read]
· The bridge served the region for 80 years, winning the hearts of residents and tourists alike with its graceful appearance.
· The lake crossing of Crown Point-Chimney Point required a 2,158-foot-long bridge and a [?]-foot clearance above the navigation channel to accommodate the smokestacks of steamboats. The placement of the bridge also had to avoid historic resources on both sides of the lake.
· Because the bridge piers were constructed in a lake rather than a river and would not be subjected to scouring from rushing water Spofford decided that they did not require any armor. The lake's freezing and thawing[?] cycles, however, exposed the unprotected piers to horrendous[?] stress.
· This sign was prepared as part of a larger program of commemoration to mitigate the loss of the 1929 Lake Champlain Bridge. It was developed in response to Section 106 of the National Historic Preservation Act and was funded jointly by the New York State Department of Transportation, the Vermont Agency of Transportation, and the Federal Highway Administration.
Details
HM NumberHM226O
Tags
Placed ByNY State Dept of Trans, VT Agency of Trans, and Federal Hwy Admin
Marker ConditionNo reports yet
Date Added Thursday, October 19th, 2017 at 10:02pm PDT -07:00
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Locationbig map
UTM (WGS84 Datum)18T E 623563 N 4877836
Decimal Degrees44.04328333, -73.45770000
Degrees and Decimal MinutesN 44° 2.597', W 73° 27.462'
Degrees, Minutes and Seconds44° 2' 35.82" N, 73° 27' 27.72" W
Driving DirectionsGoogle Maps
Area Code(s)518
Which side of the road?Marker is on the right when traveling West
Closest Postal AddressAt or near 14 Park Pl, Port Henry NY 12974, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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