District Information

Community High School District 155 includes four comprehensive high schools and one alternate education campus. Serving grades 9-12, each institution has full State of Illinois recognition and accreditation. Enrollment includes 6,113 students from Bull Valley, Burton's Bridge, Cary, Crystal Lake, Fox River Grove, Lake in the Hills, Lakewood, Oakwood Hills, Prairie Grove, and Ridgefield. The district covers 67.75 square miles and is located approximately 45 miles northwest of Chicago in McHenry and Lake counties.​

Beginning in 1884, a single public school, Union School, taught all Crystal Lake elementary and high school students. In 1907, the high school moved into its own building on the Union School grounds. Twelve years later, Community High School District 155 was established by a ballot measure in December of 1919. H.A. Dean served as the district's first superintendent. Crystal Lake Community High School opened at the current site of Crystal Lake Central High School on May 12, 1924. The school served students from Crystal Lake, Cary, Fox River Grove, and the surrounding areas, all of whom attended Crystal Lake Community High School until 1961, when Cary-Grove High School was opened. Crystal Lake South High School opened in 1978. At that time, Crystal Lake Community High School became Crystal Lake Central. A fourth high school, Prairie Ridge, opened in 1997. The district opened an alternative education campus, Haber Oaks Campus, in 2008​.

Students come to the high schools from several public elementary school districts including Crystal Lake District 47Cary Community Consolidated School District 26Fox River Grove School District 3, and Prairie Grove School District 46.

All District 155 juniors take the SAT which measures academic progress of current juniors and assesses college readiness. Previously, all juniors took the American College Test (ACT). The composite score for Community High School District 155 seniors graduating in 2018 was 540.1 in the English Language Arts portion and an average of 549.9 in the Math portion compared to a state average of 505.7 in ELA and  504.1 in Math. In other testing, the district is one of only 433 districts in the U.S. and Canada named to the 8th AP Honor Roll by the College Board for increasing AP® participation while maintaining student success rates. Only 22 Illinois school districts were recognized. During the 2017-18 school year, a total of 3,503 Advanced Placement® exams were taken and 76% of students earned an honor scores. Further, 90% of the students in the class of 2018 continued their education beyond high school at 2- or 4-year colleges/universities or technical/vocational schools.

In 2017, The Washington Post honored District 155 for maintaining a high level of rigor in its schools. Cary-Grove (1,149), Crystal Lake South (1,345), and Prairie Ridge (1,254) all ranked among the top nationally. The Washington Post's national list includes about 22,000 with three District 155 schools ranking in the top 2,000. Further, Newsweek lists Cary-Grove and Crystal Lake Central in the top 3% of all U.S. public high schools.

The district employs nearly 741 people including teachers, building administrators, and a full complement of district administrators, school counselors, social workers, school psychologists, school nurses, support staff, and special education services personnel. In the core subjects, all of the district's teachers are teaching in their academic major. In fact, approximately 86% hold master's degrees or higher.

District 155 is one of Illinois' most financially healthy school districts, having received the highest financial rating from the Illinois State Board of Education for each of the last fifteen fiscal years. The Financial Recognition rating is based on fund balance to revenue ratio, expenditures to revenue ratio, days cash on hand, short-term borrowing, and long-term debt. Community High School District 155 received a Certificate of Excellence in Financial Reporting from Association of School Business Officials (ASBO) International.  The district was recognized for its Comprehensive Annual Financial Report for the 2017 Fiscal Year.

Steve Olson serves as Superintendent, and was appointed in August 2017.

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2017 Washington Post - Most Challenging High Schools
Each year, The Washington Post determines the nation's and each state's most challenging high schools according to a set of factors. Cary-Grove, Crystal Lake South, and Prairie Ridge all ranked in the top 10 percent of the most challenging high schools.

District 155: 6,113

District 155 Average Class Size: 18

Total Number of  Full Time Teachers: 346

Teachers with a Master's Degree or Higher: 86%

Scholarships Earned in 2018-2019: $11,713,410

4-Year Graduation Rate
District 155: 95%
State: 85%

Students continuing their education after high school: 89%

2017-2018 SAT Average
District 155 ELA: 540.1
District 155 Math: 549.9

State ELA: 505.7
State Math: 504.1

2017-18 Advanced Placement® & Dual Credit

AP®Exams Taken
District 155: 5,514

Number AP® Exams Resulting in College Credit: 4,286

Percentage of AP® Exams Earning Honor Scores: 76%

Dual Credit Courses & Enrollment

Autos II                                      22
     -McHenry County College
Calculus                                     26
     - University of Illinois
Computer Business App.       282
      -McHenry County College
Culinary Arts II Commercial    32
      -McHenry County College
Marketing                                   81
      -McHenry County College
Music Appreciation                   33
      -McHenry County College
Spanish IV                                  289
      -McHenry County College