The bridge has wrought iron main girders with tubular flanges. Iron tie bars run along inside the top flange. The original span was 120ft 9in.

In 1863, the bridge was shortened by 10ft and re-installed at Thomas Howard's new North Entrance Lock, were it can be seen today, swung parallel to the lock and fixed in position. It is under the 1965 swing bridge.

A replica of the original was installed at South Entrance Lock and was in use up until the 1880s. This one is now also fixed but still provides vehicular access across the lock entrance.