Charles Bridge the 1870s, the first regular public-transport (omnibus) line went over the bridge (officially called "Charles Bridge" after 1870) later replaced by a horse tram. The bridge towers underwent a thorough reconstruction between 1874 and 1883. On 2–5 September 1890, another disastrous flood struck Prague and severely damaged Charles Bridge. Thousands of rafts, logs and other floating materials that escaped from places upstream gradually formed a huge barrier leaning against the bridge. Three arches were torn down by the great pressure and two pillars collapsed from being undermined by the water, while others were partly damaged. With the fifth pillar, two
Charles River Dam Bridge piers. The original lock for the Charles River was just west of the Charles River Dam Bridge, but the lock services was relocated east to the Charles River Dam and incorporated as three parallel locks on the site of the old Warren Bridge. The former lock at the Charles River Dam Bridge now allows water and small ships to flow freely. Taller ships require the opening of the drawbridge, operated by the Massachusetts Department of Transportation. The first bridge on the site was known as the Canal Bridge, named after the Middlesex Canal which ran from the Charlestown Mill Pond