The First River, in the state of New Jersey in the United States, is the first main tributary of the Passaic River encountered while travelling upstream from its mouth at Newark Bay. However, in the 19th century, it was completely paved over, and now flows underground through sewers until discharging into the Passaic. It flowed through, and now flows under, what is now Branch Brook Park in the city of Newark.
It was also known as Mill Brook, having supported several mills, including grist mills for the earliest settlers of Newark in the 17th century.
It began to be covered in 1863, and the covering was complete by 1890. Today, it flows through two sewer tubes, each six feet nine inches high by nine feet three inches wide.
Tributaries
This list is incomplete; you can help by expanding it (http://en.wikipedia.org/w/index.php?title=First_River&action=edit).
The Connecticut River is the largest river in New England, flowing south from the Connecticut Lakes in northern New Hampshire, along the border between New Hampshire and Vermont, through Western Massachusetts and central Connecticut into Long Island Sound at Fenwick, Connecticut.
The river carries a heavy amount of silt, especially during the spring snow melt, from as far north as Quebec.
The difficulty of navigation on the river is the primary reason that it is one of the few large rivers in the region without a major city near its mouth.