The top reported proficiency rate is 59% in English language arts. The lowest is 46% in Science.
Original Research by School Decision on Duello Elem.
Duello Elementary serves kindergarten through fifth grade in Lake St. Louis, a planned suburban community in western St. Charles County. The school sits within the Wentzville R-IV district and operates as a regular public school. Lake St. Louis itself was developed around two private lakes and remains a car-dependent setting with clustered shopping centers, a civic center, and recreational amenities like a golf course and riding stables. It is a growing suburb, with ongoing residential and commercial development.
Duello is a midsize elementary school. The student body is predominantly white, with smaller shares of Asian, Black, Hispanic, and multiracial students. A very small share of students qualify for free or reduced-price lunch, indicating an affluent neighborhood context. No data was available on the share of students with Individualized Education Programs or those learning English as a new language. That absence is not unusual for an elementary school in a high-income area, but a parent wanting details on special education or language support should ask the school directly.
On the Missouri Assessment Program, reading and math proficiency varied noticeably by grade level. Fourth graders posted strong results: about seven in ten met state standards in reading, and roughly three-quarters did so in math. Third graders performed at a similar level in reading and were close behind in math, with about six in ten proficient. Fifth grade results were softer. Slightly more than half of fifth graders were proficient in reading, but math proficiency dropped to about a third, and science proficiency came in just under half. That dip in upper-grade math is a pattern a family with a rising fifth grader might want to discuss with the school to understand curriculum and support. Despite the grade-level variation, the school’s overall proficiency index across all tested subjects and grades placed it in the top quartile relative to other districts in St. Charles County. That is a strong showing for an elementary school.
Housing in the area is well above the state and national median, with rents also high. The local economic context is one of low unemployment and rising incomes. The combination of a very low free-lunch rate and elevated housing costs points to a community with substantial household resources. Lake St. Louis continues to add residential and commercial properties, so enrollment pressure may be a factor for the district to manage, though no recent boundary or program changes were reported.
The school environment data was thin. No information on chronic absenteeism, discipline rates, staffing ratios, or course access was available in the source material. Again, a parent wanting those specifics should ask the school. The district itself reported no recent changes of lasting impact that surfaced in a web search.
Duello is a solid performer in an affluent, growing suburban corridor. The academic picture is strongest in the earlier elementary grades, with some softness in fifth-grade math and science. The student body is economically homogeneous, which shapes the peer environment. For families in Lake St. Louis seeking a neighborhood elementary school with generally strong test scores and a low-poverty setting, Duello fits that profile. The main open questions are around upper-grade mathematics instruction and the support services that the school can offer if a child needs extra help.
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