headwater

noun

head·​wa·​ter ˈhed-ˌwȯ-tər 

-ˌwä-

: the source of a stream

—usually used in plural

Synonyms of headwater

• tributary
• source
• headstream

Examples of headwater in a Sentence

the first exploration of the Missouri River from its mouth to its headwaters was made by Meriwether Lewis and William Clark in the early 1800s

Recent Examples on the Web

The headwaters of the Colorado River, a vital source of water for 35 million people and 5 million acres of farmland, is drier than anyone can remember, my colleague Ian James reports. — Noah Haggerty, Los Angeles Times, 2 July 2026

Its headwaters are in Indian River County, its mouth in the Atlantic near Jacksonville, which is the furthest place Sanders Fish House delivers its wild catch. — Amy Drew Thompson, The Orlando Sentinel, 28 June 2026

Lake Assinica in the Broadback headwaters has attracted world-wide attention for its giant squaretails the past two years. — Marc Terziev, Outdoor Life, 25 June 2026

Long-term drought fueled by climate change has shrunk the Colorado River’s flows as federal officials and water leaders in the seven basin states — including Colorado, home to its headwaters — struggle to agree on longer-term plans for the river’s management. — Elise Schmelzer, Denver Post, 21 June 2026

Word History

First Known Use

1612, in the meaning defined above

Rhymes for headwater

• backwater
• bathwater
• blackwater
• breakwater
• deepwater
• edgewater
• feedwater
• floodwater
• freshwater
• granddaughter
• groundwater
• manslaughter

Kids Definition

headwater

noun

head·​wa·​ter -ˌwȯt-ər 

-ˌwät-

: the beginning and upper part of a stream

—usually used in plural