The Lower Passaic River in New Jersey is the section of the Passaic River below the Great Falls which flows over the Dundee Dam to the river mouth at Newark Bay in the northeastern part of the state. Its midpoint generally delineates the Essex-Hudson and Passaic-Bergen county lines. Numerous spans, mostly moveable bridges, have been built over of the lower reaches of the river, which is tidally influenced to the dam at about mile point (MP) 17.4 and channelized to about MP 17. Once one of the most heavily used waterways in the Port of New York and New Jersey, it remains partially navigable for commercial marine traffic. While requests have significantly diminished since the mid-late 20th century, the bridge at MP 11.7 and those downstream from it are required by federal regulations to open