Nubanusit Brook

{{Short description|Stream in New Hampshire, United States}}

{{Use American English|date=February 2025}}

{{Infobox river

| name = Nubanusit Brook

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| image = USACE MacDowell Lake and Dam.jpg

| image_caption = Edward MacDowell Dam and Lake on Nubanusit Brook

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| pushpin_map = New Hampshire#USA

| pushpin_map_size = 250 px

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| subdivision_type1 = Country

| subdivision_name1 = United States

| subdivision_type2 = State

| subdivision_name2 = New Hampshire

| subdivision_type3 = Counties

| subdivision_name3 = Cheshire, Hillsborough

| subdivision_type4 = Towns

| subdivision_name4 = Nelson, Harrisville, Dublin, Peterborough

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| length = {{convert|14.3|mi|km|abbr=on}}

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| source1 = Nubanusit Lake

| source1_location = Nelson

| source1_coordinates= {{coord|42|58|26|N|72|5|8|W|type:river|display=inline}}

| source1_elevation = {{convert|419|m|ft|order=flip|abbr=on}}

| mouth = Contoocook River

| mouth_location = Peterborough

| mouth_coordinates = {{coord|42|52|31|N|71|56|56|W|type:river|display=inline,title}}

| mouth_elevation = {{convert|710|ft|abbr=on}}

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| tributaries_left = Jaquith Brook

| tributaries_right = Brickyard Brook, Brush Brook

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Nubanusit Brook is a {{convert|14.3|mi|km|adj=mid|-long}} stream in southern New Hampshire in the United States.{{Cite web |title=Nubanusit Neighborhood & Farm |url=http://www.nhcohousing.com/ |access-date=November 11, 2020 |website=Nubanusit Neighborhood & Farm|language=en}} The brook begins at the outlet of Nubanusit Lake in Nelson. It is a tributary of the Contoocook River, part of the Merrimack River watershed.{{Cite web |title=New Hampshire Division of Historical Resources |url=https://www.townofpeterborough.com/vertical/sites/%7B792D537E-D69C-464A-80FB-790917F72F17%7D/uploads/MainSt_Bridge.pdf |website=www.townofpeterborough.com}} The brook flows south into Harrisville, interrupted by Harrisville Pond and Skatutakee Lake, then east to the MacDowell Reservoir (constructed for flood control) in Peterborough. The brook turns south, passes the village of West Peterborough, and reaches the Contoocook River after passing through Peterborough village.

Nubanusit Brook was important to the establishment and development of Harrisville and Peterborough because many dams were built along it to provide water power to mills.{{Cite web |title=Nubanusit Lake Dam, Phase I Inspection Report |url=https://apps.dtic.mil/dtic/tr/fulltext/u2/a156441.pdf |archive-url=https://web.archive.org/web/20201111142001/https://apps.dtic.mil/dtic/tr/fulltext/u2/a156441.pdf |url-status=live |archive-date=November 11, 2020 |website=apps.dtic.mil}} These included substantial textile mills in Harrisville, West Peterborough, and Peterborough, as well as smaller mills along the brook's course.