The Flatrock River, also known as Flatrock Creek and other variants of the two names, is a 98 miles (157.7 km) tributary

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 of the East Fork of the White River

White River (Indiana)

The White River is a two-forked river that flows through central and southern Indiana and is the main tributary to the Wabash River. Via the west fork, considered to be the main stem of the river by the U.S. Board on Geographic Names, the White River is long.-West Fork:The West Fork, long, is...

 in east-central Indiana

Indiana

Indiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...

 in the United States

United States

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

. Via the White, Wabash

Wabash River

The Wabash River is a river in the Midwestern United States that flows southwest from northwest Ohio near Fort Recovery across northern Indiana to southern Illinois, where it forms the Illinois-Indiana border before draining into the Ohio River, of which it is the largest northern tributary...

 and Ohio

Ohio River

The Ohio River is the largest tributary, by volume, of the Mississippi River. At the confluence, the Ohio is even bigger than the Mississippi and, thus, is hydrologically the main stream of the whole river system, including the Allegheny River further upstream...

 rivers, it is part of the watershed

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

 of the Mississippi River

Mississippi River

The Mississippi River is the largest river system in North America. Flowing entirely in the United States, this river rises in western Minnesota and meanders slowly southwards for to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains...

, draining an area of 532 square miles (1,377.9 km²).

The Flatrock River rises near Mooreland

Mooreland, Indiana

Mooreland is a town in Blue River Township, Henry County, Indiana, United States. The population was 375 at the 2010 census.-Geography:Mooreland is located at ....

 in northeastern Henry County

Henry County, Indiana

As of the census of 2000, there were 48,508 people, 19,486 households, and 13,971 families residing in the county. The population density was 124 people per square mile . There were 20,592 housing units at an average density of 52 per square mile...

, and flows generally southwestwardly through Rush

Rush County, Indiana

As of the census of 2000, there were 18,261 people, 6,923 households, and 5,046 families residing in the county. The population density was 45 people per square mile . There were 7,337 housing units at an average density of 18 per square mile...

, Decatur

Decatur County, Indiana

As of the census of 2000, there were 24,555 people, 9,389 households, and 6,882 families residing in the county. The population density was 66 people per square mile . There were 9,992 housing units at an average density of 27 per square mile...

, Shelby

Shelby County, Indiana

As of the census of 2000, there were 43,445 people, 16,561 households, and 12,056 families residing in the county. The population density was 105 people per square mile . There were 17,633 housing units at an average density of 43 per square mile...

 and Bartholomew

Bartholomew County, Indiana

Bartholomew County is a county located in the U.S. state of Indiana, and determined by the U.S. Census Bureau to include the mean center of U.S. population in 1900. As of 2010, the population was 76,794...

 counties, past the communities of Lewisville

Lewisville, Indiana

Lewisville is a town in Franklin Township, Henry County, Indiana, United States. The population was 366 at the 2010 census.-Geography:Lewisville is located at , along the Flatrock River....

, Rushville

Rushville, Indiana

Rushville is a city in Rushville Township, Rush County, Indiana, United States. The population was 6,341 at the 2010 census. The city is the county seat of Rush County. It was the campaign headquarters for Wendell Willkie's 1940 presidential campaign against Franklin D. Roosevelt. Willkie is buried...

 and St. Paul

St. Paul, Indiana

St. Paul is a small town on the border of Decatur and Shelby counties in the U.S. state of Indiana. The population was 1,031 at the 2010 census.-Geography:St...

. It joins the Driftwood River

Driftwood River

The Driftwood River is a tributary of the East Fork of the White River in central Indiana in the United States. Via the White, Wabash and Ohio rivers, it is part of the watershed of the Mississippi River...

 at Columbus

Columbus, Indiana

Columbus is a city in and the county seat of Bartholomew County, Indiana, United States. The population was 44,061 at the 2010 census, and the current mayor is Fred Armstrong. Located approximately 40 miles south of Indianapolis, on the east fork of the White River, it is the state's 20th largest...

 to form the East Fork of the White River.

In Decatur County it collects the Little Flatrock River, which rises in Rush County and flows southwestwardly 23.4 miles (37.7 km), past Milroy

Milroy, Indiana

Milroy is located in Anderson Township, in the southern part of Rush County, Indiana. It is the location of Milroy Elementary School, a school in the Rush County Schools Corporation. It had a population of 604 at the 2010 census....

.

Variant names

The United States Board on Geographic Names

United States Board on Geographic Names

The United States Board on Geographic Names is a United States federal body whose purpose is to establish and maintain uniform usage of geographic names throughout the U.S. government.-Overview:...

 settled on "Flat Rock River" as the stream's name in 1917, and changed it to "Flatrock River" in 1959. According to the Geographic Names Information System

Geographic Names Information System

The Geographic Names Information System is a database that contains name and locative information about more than two million physical and cultural features located throughout the United States of America and its territories. It is a type of gazetteer...

, it has also been known historically as "Big Flat Rock River," "Big Flatrock River," "Flat Rock Creek," and "Flatrock Creek."