The City of Lake Saint Louis is situated around two lakes between Interstate 70 and Interstate 64 in western St. Charles County, Missouri , United States. The population was 14,160 as of the 2008 US Census estimate. Lake Saint Louis is a suburb of St. Louis.
In January 1961 Ellis Ellerman and Ira Nathan began developing plans for a private resort community, a popular concept in the 1960s in the St. Louis region. The vision was for a weekend resort with a lake large enough for recreation and a location close to St. Louis. Ellerman and Nathan hired engineers to begin the initial planning of the lake and community, and Nathan named the project "Lake Saint Louis" in 1961.
Ellerman and Nathan formed Trails Lake Development Corp. in 1962, and by August 31 of that year, 10 lots had already been sold in the project, which was to feature a 625 lake (PD article 8-25-63). Ellerman and Nathan lacked adequate financing, and they soon found themselves in over their heads on the project. Ellerman and Nathan were soon joined by several other investors to keep the project afloat, including R. T. Crow. The financial troubles continued for Ellerman and Nathan, and The Healey Discount Corp., owned by Crow and the three other investors, foreclosed on Ellerman and Nathan's Trails Lake Development Corp. in June 1966.
R. T. Crow investigated the idea of new towns, including visiting many others in the east. In the end, Crow bought out the other three investors who were part of The Healey Discount Corp., and he became the sole developer of the Lake Saint Louis development. St. Charles County approved the preliminary plan for Lake Saint Louis in April 1967. People who had purchased lots from the first developers were given credits for lots in the new Lake Saint Louis project.
The first residents of Lake Saint Louis were the Neal family, who moved to an existing home on the property in January, 1968. Gene Neal later became a vice president of one of Crow's company, his wife Hazel managed the Lake St Louis Louis Club.
By 1969, the 85-acre (34 ha) Lake Sainte Louise, the 9-hole, 3-par golf course, tennis courts, clubhouse and pool were open. Construction on the dam for the 600-acre (2.4 km2) Lake Saint Louis, the larger of the two lakes in the community, began in 1968. It was completed in 1972, and Crow filed for Chapter 11 Bankruptcy in 1974 - an action brought on in part by the energy crisis . Interstate highway speeds were reduced from 70 to 55 mph (110 to 89 km/h). Also, the I-70 bridge over the Missouri River was closed partially while the second bridge was added. All of which made Lake Saint Louis suddenly too far away from employment and retail centers.
With Crow out of the picture, and the looming threat of annexation from O'Fallon on the East and Wentzville on the West, the residents of the Harbor Town area of the community petitioned St. Charles County Circuit Court for incorporation of the Town of Harbor Town. The Court granted the petition in June, 1975, and with the approval of the incorporation, the Circuit Court appointed a Board of Trustees: George Heidelbaugh, Charles Bailey, David Spitznagel, Betty Patton and Howard Haddock as Chairman. In December 1975, the town boundaries were expanded to include what was known as Phase A, the western-most portion of the city. In 1976 a special census was conducted that counted 2,445 residents. Residents voted in 1977 to change the name to Lake Saint Louis and become a 4th Class City under the Revised Statute.