Oliverian Brook is a 13.1 mile long (21.2 km) river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 in western New Hampshire

New Hampshire

New Hampshire is a state in the New England region of the northeastern United States of America. The state was named after the southern English county of Hampshire. It is bordered by Massachusetts to the south, Vermont to the west, Maine and the Atlantic Ocean to the east, and the Canadian...

 in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. It is a tributary of the Connecticut River

Connecticut River

The Connecticut River is the largest and longest river in New England, and also an American Heritage River. It flows roughly south, starting from the Fourth Connecticut Lake in New Hampshire. After flowing through the remaining Connecticut Lakes and Lake Francis, it defines the border between the...

, which flows to Long Island Sound

Long Island Sound

Long Island Sound is an estuary of the Atlantic Ocean, located in the United States between Connecticut to the north and Long Island, New York to the south. The mouth of the Connecticut River at Old Saybrook, Connecticut, empties into the sound. On its western end the sound is bounded by the Bronx...

.

Oliverian Brook rises in the town of Benton, New Hampshire

Benton, New Hampshire

Benton is a town in Grafton County, New Hampshire, United States. The population was 364 at the 2010 census. Located in the White Mountains, Benton is largely surrounded by the White Mountain National Forest. The town is crossed by the Appalachian Trail....

 on the western slopes of Mount Moosilauke in the White Mountain National Forest

White Mountain National Forest

The White Mountain National Forest is a federally-managed forest contained within the White Mountains in the northeastern United States. It was established in 1918 as a result of the Weeks Act of 1911; federal acquisition of land had already begun in 1914. It has a total area of...

, at the juncture of Jeffers Brook and Slide Brook. The brook flows south to the village of Glencliff

Glencliff, New Hampshire

Glencliff is a village within the White Mountain National Forest in the town of Warren in Grafton County, New Hampshire, United States.The village consists of fewer than one hundred residents and some forty man-made structures, including the Willing Workers Hall, the Glencliff Community Chapel, the...

 in the town of Warren

Warren, New Hampshire

Warren is a town in Grafton County, New Hampshire, United States. The population was 904 at the 2010 census. Warren includes the village of Glencliff....

 before taking a sharp turn to the northwest and flowing through the center of Oliverian Notch, the westernmost of the major passes

Mountain pass

A mountain pass is a route through a mountain range or over a ridge. If following the lowest possible route, a pass is locally the highest point on that route...

 through the White Mountains

White Mountains (New Hampshire)

The White Mountains are a mountain range covering about a quarter of the state of New Hampshire and a small portion of western Maine in the United States. Part of the Appalachian Mountains, they are considered the most rugged mountains in New England...

.

The brook passes through a flood control reservoir known as Oliverian Pond before entering the town of Haverhill

Haverhill, New Hampshire

Haverhill is a town in Grafton County, New Hampshire, United States. The population was 4,697 at the 2010 census. Haverhill includes the villages of Woodsville, Pike, and North Haverhill, the historic town center at Haverhill Corner, and the district of Mountain Lakes...

, where it passes through the villages of East Haverhill and Pike

Pike, New Hampshire

Pike is a small village within the town of Haverhill, New Hampshire, in the United States. It is located in western Grafton County, approximately east of the village of Haverhill, on Oliverian Brook...

 before reaching the Connecticut River near Haverhill village. New Hampshire Route 25

New Hampshire Route 25

New Hampshire Route 25 is a long east–west state highway in New Hampshire. It runs completely across the state from Vermont to Maine.The western terminus of Route 25 is at the Vermont state line on the Connecticut River in Piermont, where the road continues west as Vermont Route 25...

 closely follows Oliverian Brook from Glencliff to NH 10

New Hampshire Route 10

New Hampshire Route 10 is a north–south state highway in the U.S. state of New Hampshire. Its southern terminus is at the Massachusetts state line in the town of Winchester. In Massachusetts the highway becomes Massachusetts Route 10. Total length of the highway is .-Route description:NH 10...

near the Connecticut River.