Lehigh Drive closed from 25th Street

Lehigh Drive is closed from 25th street so everyone must approach from Glendon Hill Road or Lehigh Drive from downtown (and keep an eye on our website for flooding updates – it’s been a wet start to the month!)

Is it Change or Chain?

National Canal Museum - Is it Change or Chain?
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The current “Chain Dam”

The dam on the Lehigh River near the Locktender’s House in Hugh Moore Park is undoubtedly picturesque, but why is it sometimes called the “Chain Dam”?  And you might have heard about a bridge that was once nearby, but some sources call it the “Chain Bridge” and others the “Change Bridge”.  We’re going to set the record straight.

To start off, most stretches of the Lehigh Canal and towpath follow the eastern/northern bank of the Lehigh River.  However, in Bethlehem Township, the canal boats had to cross the river because Section 8 of the canal (the part in Hugh Moore Park) is on the other side. This was so that the boats could more easily enter the Delaware Canal after exiting the final lock of the Lehigh near the Forks of the Delaware.

Chain Dam and Section 8 of the Lehigh Canal are seen in this photo from about 1900. In the rear is the trolley trestle to the amusement park that gave Island Park its name.

Before 1857, the boats were poled across the Lehigh River more than a mile upstream of Dam No. 8. That dam was commonly known as “Chain Dam” because Lehigh Coal and Navigation (LCN) had installed a large chain near it that was intended to stop any boats from disastrously going over the dam. Even so, that fate befell at least one boat in the 19th century; the crew, mules and coal were all lost. It must have been a nerve-wracking crossing, particularly in bad weather.

In 1855, LCN’s chief engineer proposed using the big island (now known as Island Park) just upstream of the dam to get across the river. In 1857, a short causeway was built from the Bethlehem Township side to the west end of the island, and a nearly mile long towpath ran along its south shore to the “Change Bridge”, a suspension bridge supported by iron wire rope. The mules walked over it, towing the boats over the main part of the river to the opposite bank. From there it was a short distance to the entrance to Section 8 of the canal.

In this photo, a “light” or empty boat is headed upstream. If you look closely, the mules can be seen on the Change Bridge.

Today, only the stone abutments of the “Change Bridge” remain. The current “Chain Dam”, also known as Glendon Dam, was built in the 1970s after the original dam was destroyed by ice in 1965.

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