Prairie du Rocher ("The Rock Prairie" in
French) is a village in
Randolph County,
Illinois
Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. It borders on Lake Michigan to its northeast, the Mississippi River to its west, and the Wabash River, Wabash and Ohio River, Ohio rivers to its ...
,
United States
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
. Founded in the
French colonial period in the
Midwest
The Midwestern United States (also referred to as the Midwest, the Heartland or the American Midwest) is one of the four census regions defined by the United States Census Bureau. It occupies the northern central part of the United States. It ...
, the community is located near bluffs that flank the east side of the
Mississippi River
The Mississippi River is the main stem, primary river of the largest drainage basin in the United States. It is the second-longest river in the United States, behind only the Missouri River, Missouri. From its traditional source of Lake Ita ...
along the
floodplain
A floodplain or flood plain or bottomlands is an area of land adjacent to a river. Floodplains stretch from the banks of a river channel to the base of the enclosing valley, and experience flooding during periods of high Discharge (hydrolog ...
often called the "
American Bottom". The population was 502 at the 2020 census.
Prairie du Rocher is one of the oldest communities in the 21st-century United States that was founded as a French settlement. About four miles to the west, closer to the Mississippi River, is
Fort de Chartres, site of a French military fortification and colonial headquarters established in 1720. Some buildings were reconstructed after falling into ruin, and the complex is now a state park and historical site. The fort and the town were a center of government and commerce when France claimed a vast territory in North America,
New France
New France (, ) was the territory colonized by Kingdom of France, France in North America, beginning with the exploration of the Gulf of Saint Lawrence by Jacques Cartier in 1534 and ending with the cession of New France to Kingdom of Great Br ...
or ''La Louisiane'', which stretched from present-day
Louisiana
Louisiana ( ; ; ) is a state in the Deep South and South Central regions of the United States. It borders Texas to the west, Arkansas to the north, and Mississippi to the east. Of the 50 U.S. states, it ranks 31st in area and 25 ...
and the
Illinois Country
The Illinois Country ( ; ; ), also referred to as Upper Louisiana ( ; ), was a vast region of New France claimed in the 1600s that later fell under Spanish and British control before becoming what is now part of the Midwestern United States. Whi ...
to
Canada
Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun ...
.
The village was founded in 1722 by
French colonists, mostly migrants from Canada.
History
New France
In 1718,
Pierre Dugué de Boisbriand built the first
Fort de Chartres. In 1722,
St. Thérèse Langlois, a nephew of Boisbriand, founded Prairie du Rocher. The town was built on a tract of land donated by the
Royal Indian Company. Boisbriand later became the commandant of the area. The town was strategically located along fertile
Mississippi River
The Mississippi River is the main stem, primary river of the largest drainage basin in the United States. It is the second-longest river in the United States, behind only the Missouri River, Missouri. From its traditional source of Lake Ita ...
bottomland. Surpluses from the productive cultivation by ''
habitants'' later helped supply critical wheat and corn to New Orleans and other lower
Louisiana Territory
The Territory of Louisiana or Louisiana Territory was an organized incorporated territory of the United States that existed from July 4, 1805, until June 4, 1812, when it was renamed the Missouri Territory. The territory was formed out of t ...
communities.
D'Artaguette, an inspector in the country in the early 18th century, wrote:
This country is one of the most beautiful in all Louisiana. Every kind of grain and vegetables are produced here in the greatest abundance .... they have, also, large numbers of oxen, cows, sheep, etc., upon the prairies. Poultry is abundant, and fish plentiful. So that, in fact, they lack none of the necessaries or conveniences of life.
In 1743 the territorial government granted the Prairie du Rocher Common (land used by all the villagers) to the village; the common was used until 1852. The villagers had plots for cultivation defined in typical French fashion:
long narrow lots that reached back from the riverfront through the common. The villagers kept the plots open within the common, and built a fence around it to keep out livestock. A school existed as early as the 1760s; students boarded with local families.

Because the ''habitants'' did not practice fertilization, the soil became exhausted. In addition, an increase in population meant there was not sufficient land for everyone. Some villagers moved to the west side of the Mississippi and founded
Ste. Genevieve about 1750, in present-day
Missouri
Missouri (''see #Etymology and pronunciation, pronunciation'') is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. Ranking List of U.S. states and territories by area, 21st in land area, it border ...
. They quickly created an agricultural community with characteristics similar to Prairie du Rocher.
British rule
Following their victory in the
French and Indian War
The French and Indian War, 1754 to 1763, was a colonial conflict in North America between Kingdom of Great Britain, Great Britain and Kingdom of France, France, along with their respective Native Americans in the United States, Native American ...
(also known as the
Seven Years' War
The Seven Years' War, 1756 to 1763, was a Great Power conflict fought primarily in Europe, with significant subsidiary campaigns in North America and South Asia. The protagonists were Kingdom of Great Britain, Great Britain and Kingdom of Prus ...
), the British gained possession of French lands east of the Mississippi, excluding
New Orleans
New Orleans (commonly known as NOLA or The Big Easy among other nicknames) is a Consolidated city-county, consolidated city-parish located along the Mississippi River in the U.S. state of Louisiana. With a population of 383,997 at the 2020 ...
. The
Treaty of Paris was signed in 1763; however, the British did not arrive in force until 1765. To avoid British rule, many of the town's French residents moved across the
Mississippi River
The Mississippi River is the main stem, primary river of the largest drainage basin in the United States. It is the second-longest river in the United States, behind only the Missouri River, Missouri. From its traditional source of Lake Ita ...
to towns such as
Ste. Genevieve and
St. Louis in what was now, via the secret
Treaty of Fontainebleau,
Spanish Louisiana. Additionally, King
George III
George III (George William Frederick; 4 June 173829 January 1820) was King of Great Britain and King of Ireland, Ireland from 25 October 1760 until his death in 1820. The Acts of Union 1800 unified Kingdom of Great Britain, Great Britain and ...
's
Royal Proclamation of 1763
The Royal Proclamation of 1763 was issued by British King George III on 7 October 1763. It followed the Treaty of Paris (1763), which formally ended the Seven Years' War and transferred French territory in North America to Great Britain. The ...
designated all the land west of the
Appalachians and east of the Mississippi an
Indian Reserve
In Canada, an Indian reserve () or First Nations reserve () is defined by the '' Indian Act'' as a "tract of land, the legal title to which is vested in Her Majesty, that has been set apart by Her Majesty for the use and benefit of a band." ...
. He tried to prevent settlers entering from the
British Colonies.
American Revolution
During the
American Revolutionary War
The American Revolutionary War (April 19, 1775 – September 3, 1783), also known as the Revolutionary War or American War of Independence, was the armed conflict that comprised the final eight years of the broader American Revolution, in which Am ...
,
George Rogers Clark
George Rogers Clark (November 19, 1752 – February 13, 1818) was an American military officer and surveyor from Virginia who became the highest-ranking Patriot (American Revolution), Patriot military officer on the American frontier, nort ...
captured Prairie du Rocher for the colonies in his
Illinois campaign that also resulted in the capture of
Vincennes, Indiana. Reportedly, his campaign caused some of the remaining French settlers to emigrate to the Spanish-controlled territories west of the Mississippi, leaving relatively few in Prairie du Rocher. Many of the subsequent settlers of the area had been members of Clark's campaign, or were related to someone who was. They were convinced of the promise of the area by tales of the fertility of the soil in the area now called
American Bottom.
1993 floods
Prairie du Rocher was one of the few towns along the
Mississippi River
The Mississippi River is the main stem, primary river of the largest drainage basin in the United States. It is the second-longest river in the United States, behind only the Missouri River, Missouri. From its traditional source of Lake Ita ...
that escaped being flooded in the
Great Flood of 1993
The Great Flood of 1993 (or Great Mississippi and Missouri Rivers Flood of 1993) was a flood that occurred in the Midwestern United States, along the Mississippi River, Mississippi and Missouri River, Missouri rivers and their tributaries, from ...
. After levees broke to the north near the towns of
Columbia and
Valmeyer, Illinois, flood waters engulfed Fort de Chartres. They also threatened the town of Prairie du Rocher.
With only the
Prairie du Rocher Creek levee protecting the town, residents discovered a unique situation had developed. The water that had broken through the main Mississippi River levee and was approaching the top of the
Prairie du Rocher Creek levee was higher than the water in the main Mississippi River channel. The
Army Corps of Engineers (COE) decided to use a barge-mounted shovel to break through the Mississippi River levee near Fort de Chartres, to allow flood waters to escape back to the Mississippi River channel. While not significantly lowering the water level, the COE decided against any further action.
In a 3:30 a.m. decision, with the flood waters at the top of the sandbags stacked on top of the Prairie du Rocher Creek levee, all three commissioners of the Fort de Chartres – Ivy Landing Drainage and Levee District voted to use
dynamite
Dynamite is an explosive made of nitroglycerin, sorbents (such as powdered shells or clay), and Stabilizer (chemistry), stabilizers. It was invented by the Swedish people, Swedish chemist and engineer Alfred Nobel in Geesthacht, Northern German ...
to breach the levee in two additional locations. Because of risk, the COE had argued against such a decision. The village put out a call for help and added a foot and a half of sandbags to the creek levee. Finally, the two openings allowed enough water to escape back to the main channel so that the town was saved from flooding. The levee still stands strong today.
Recent history

French settlers founded Prairie du Rocher circa 1722. At least twelve surviving houses in the village were built in the eighteenth century, including the Melliere House, which was constructed in 1735. Another is the
Creole House, constructed in 1800, which was built in the
French Colonial style by an unknown English-speaking immigrant from the eastern United States.
Arts and culture
French customs practiced in Prairie du Rocher include ''
La Guiannée'', a custom of
caroling on New Year's Eve dating back to
medieval
In the history of Europe, the Middle Ages or medieval period lasted approximately from the 5th to the late 15th centuries, similarly to the post-classical period of World history (field), global history. It began with the fall of the West ...
times in France. It has been celebrated in Prairie du Rocher every New Year's Eve since settlement in 1722. The town also celebrates ''Rendezvous'' during the summer, as well as the winter, at the
Fort de Chartres. During that time, people from a broad area come to camp out for the weekend. They dress like Indians and French soldiers of the mid-18th century, camp out at the fort, and re-enact the wars that decided the ownership of the fort.
Fort de Chartres is a French military fort constructed in the 18th century. It later was designated an Illinois state historic site.
Geography
According to the 2010 census, Prairie du Rocher has a total area of , all land.
Illinois Route 155 is the only state highway that runs through Prairie du Rocher. It connects the town with
Ruma, to the northeast, and
Fort de Chartres, to the west. Bluff Road connects the town to as far south as
Ellis Grove and as far north as
Columbia.
Demographics
As of the
census
A census (from Latin ''censere'', 'to assess') is the procedure of systematically acquiring, recording, and calculating population information about the members of a given Statistical population, population, usually displayed in the form of stati ...
of 2000, there were 613 people, 240 households, and 160 families residing in the village. The population density was . There were 255 housing units at an average density of . The racial makeup of the village was 99.02%
White
White is the lightest color and is achromatic (having no chroma). It is the color of objects such as snow, chalk, and milk, and is the opposite of black. White objects fully (or almost fully) reflect and scatter all the visible wa ...
, 0.33%
Native American, and 0.65% from two or more races.
There were 240 households, out of which 39.2% had children under the age of 18 living with them, 52.5% were
married couples
Marriage, also called matrimony or wedlock, is a culturally and often legally recognised union between people called spouses. It establishes rights and obligations between them, as well as between them and their children (if any), and b ...
living together, 9.2% had a female householder with no husband present, and 33.3% were non-families. 28.3% of all households were made up of individuals, and 12.9% had someone living alone who was 65 years of age or older. The average household size was 2.55 and the average family size was 3.16.
In the village, the population was spread out, with 29.2% under the age of 18, 9.5% from 18 to 24, 27.2% from 25 to 44, 22.0% from 45 to 64, and 12.1% who were 65 years of age or older. The median age was 34 years. For every 100 females, there were 81.4 males. For every 100 females age 18 and over, there were 89.5 males.
The median income for a household in the village was $35,795, and the median income for a family was $44,659. Males had a median income of $31,750 versus $20,556 for females. The
per capita income
Per capita income (PCI) or average income measures the average income earned per person in a given area (city, region, country, etc.) in a specified year.
In many countries, per capita income is determined using regular population surveys, such ...
for the village was $14,771. About 9.3% of families and 8.3% of the population were below the
poverty line
The poverty threshold, poverty limit, poverty line, or breadline is the minimum level of income deemed adequate in a particular country. The poverty line is usually calculated by estimating the total cost of one year's worth of necessities for ...
, including 6.3% of those under age 18 and 14.3% of those age 65 or over.
Education
The town has one elementary school for grades K-8. Students must travel to a nearby town for high school. The village has a library and two parks, one owned by the school and the other by the town.
Infrastructure
The volunteer fire department occupies part of the city hall (which also houses the post office).
Notable people
*
Henry C. Hansbrough, U.S. Congressman and Senator from
North Dakota
North Dakota ( ) is a U.S. state in the Upper Midwest, named after the indigenous Dakota people, Dakota and Sioux peoples. It is bordered by the Canadian provinces of Saskatchewan and Manitoba to the north and by the U.S. states of Minneso ...
Gallery
File:Prairie du Rocher, Illinois, road sign.jpg, Road sign
File:Prairie du Rocher, Illinois, French colonial style house.jpg, French-Colonial style house
File:St. Joseph Roman Catholic Church, Prairie du Rocher, Illinois.jpg, St. Joseph Roman Catholic Church
External links
"Illinois Town Cuts Levee Against Federal Advice" ''The Randolph County Herald Tribune''
References
{{DEFAULTSORT:Prairie Du Rocher, Illinois
French-American culture in Illinois
Villages in Randolph County, Illinois
New France
Populated places established in 1722
French colonial settlements of Illinois Country
1722 establishments in the French colonial empire
Villages in Illinois