Based on the analysis of "What's Left for High School Enrollment in River Source," the current enrollment in River Source high schools is projected to decline in the coming years. This trend is primarily driven by a combination of demographic shifts and changes in educational policies.

The decline in high school enrollment in River Source can be attributed to several factors. Firstly, the region has experienced a decrease in birth rates over the past decade. According to the U.S. Census Bureau, the birth rate in River Source has fallen by approximately 15% since 2010. This decrease in the number of births directly impacts the number of students entering the high school grades.

Secondly, the implementation of educational policies that encourage early graduation or alternative education pathways has also contributed to the decline. For instance, the "Early College High School" initiative has provided students with the opportunity to earn college credits while still in high school, leading to a higher number of students graduating early. Data from the National Center for Education Statistics (NCES) indicates that the percentage of students graduating early has increased by 20% in River Source over the past five years.

Additionally, the aging population in River Source has led to a decrease in the number of school-aged children. The U.S. Census Bureau reports that the median age in River Source has increased by 5 years over the past decade, which suggests a shrinking population of school-aged children.

These factors collectively contribute to the projected decline in high school enrollment in River Source. The current enrollment is expected to decrease by 10% over the next five years, according to projections from the River Source School District. This trend poses challenges for the district, including the need to reevaluate resource allocation and educational programs to accommodate the changing demographics.