Prairie du Rocher, Illinois

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 bottomland. Surpluses from the productive cultivation by habitants later helped supply critical wheat and corn to New Orleans and other lower Louisiana Territory communities.[4][5]

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.[6][7]

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.[8] A school existed as early as the 1760s; students boarded with local families.

French Colonial Illinois Country

Because 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. They quickly created an agricultural community with characteristics similar to Prairie du Rocher.[9]

Following their victory in the French and Indian War (also known as the Seven Years' War), the British gained possession of French lands east of the Mississippi, excluding New Orleans. 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 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's Royal Proclamation of 1763 designated all the land west of the Appalachians and east of the Mississippi an Indian Reserve. He tried to prevent settlers entering from the then-British Colonies.[10][11]

During the American Revolutionary War, George Rogers Clark 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.[12]

Prairie du Rocher was one of the few towns along the Mississippi River that escaped being flooded in the Great Flood of 1993. 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. This did not significantly lower the water level, but the COE decided against 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 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.[13] The levee still stands strong today.

Creole House

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.[14] Another is the Creole House,[15] constructed in 1800,[16] which was built in the French Colonial style by an unknown English-speaking immigrant from the eastern United States.[17]