The Movable Dam at Lock 8

The Movable Dam at Lock 8 (HM2EQ5)

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N 42° 49.701', W 73° 59.464'

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Inscription

Schenectady/ Erie Canalway Trail

Work began here in Rotterdam in 1908 on Erie Barge Canal Lock 8. In addition to constructing Lock 8, engineers built a three-span moveable dam (about 510 feet wide) that raises boats heading upstream as much as 15 feet when the dam is activated. Many people mistake the dam for a bridge, (which it is not) but a walkway that allows for necessary maintenance. Beneath the dam's trusses are steel frames each containing a giant steel plate. Below the dam's base, a concrete sill constructed on the river bed spans the river's width. When these frames are swung open and lowered by chains onto the sill, they form a dam. Dam gates can be adjusted up or down almost like window shades, to control the volume of water and its rate of flow. Raising or lowering the dam must be carefully coordinated with the lock operators downstream to prevent the release of too much water which might flood the river bank banks. Therefore, lock gates downstream must all be raised or lowered accordingly
During the winter when the Canal is not operational, the dam's steel structures are lifted completely clear of the water allowing the river to resume its natural flow.
Details
HM NumberHM2EQ5
Series This marker is part of the Erie Canal series
Tags
Placed BySchenectady County/New York Canals
Marker ConditionNo reports yet
Date Added Monday, March 4th, 2019 at 4:01pm PST -08:00
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Locationbig map
UTM (WGS84 Datum)18T E 582465 N 4742247
Decimal Degrees42.82835000, -73.99106667
Degrees and Decimal MinutesN 42° 49.701', W 73° 59.464'
Degrees, Minutes and Seconds42° 49' 42.06" N, 73° 59' 27.84" W
Driving DirectionsGoogle Maps
Closest Postal AddressAt or near , ,
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