Summary
Watertown High School - 01 serves grades 9–12 in Watertown, South Dakota, and enrolls 1,222 students, far more than the nearby high schools, which have 54 to 226 students. Its results show a clear mix of strengths and challenges. The clearest concern is all-grades Smarter Balanced math: in 2024–25, 29% of students were proficient, compared with 43% statewide and 47% in the district—gaps of 14 and 18 percentage points, respectively.
The latest 11th-grade ACT results are a brighter picture: Watertown is above the state in ELA, math, and science, and its district results are the same. In 2025–26, 54% were proficient in ELA versus 48% statewide, 38% in math versus 34%, and 51% in science versus 45%. Among Watertown and nearby schools with results, Watertown ranked third in ELA, second in math, and first in science; its science result was 11 percentage points above the nearby-school average. Graduation is more mixed: the 2025–26 rate was 90%, above the state’s 88% but below the four nearby schools with reported rates, which ranged from 91% to 100%. Henry’s school-level ACT results are suppressed.
Over three years, all-grades math proficiency fell 7 percentage points, from 36% in 2022–23 to 29% in 2024–25, while its gap to the state widened from 5 points below to 14 points below. ELA remained strong at 66% in 2024–25, and science was 49%, both above the state; ELA’s state advantage narrowed from 18 to 15 points, while science’s narrowed from 9 to 6. SchoolDigger ranks Watertown 42nd of 130 statewide, at the 68th percentile with 3 stars, up from the 47th percentile in 2023–24. Its 2024–25 student-teacher ratio was 16.8:1, the highest reported nearby. In 2024–25, 30% of students were free/reduced lunch eligible, compared with a nearby-school average of 25%; this is context, not an explanation of results. SchoolDigger’s statewide measure of how well the school serves “Multi-racial Students” rose to the 92nd percentile in 2025–26, while its “Hispanic Students” measure was at the 12th percentile, compared with the school’s overall 68th percentile.
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