A quasi-experimental study designed to provide evidence of the effectiveness of the "Jamestown Reading Navigator" ("JRN") program for students in grades 9-10 was conducted in the Miami Dade Public School District (MDCSD). "Jamestown Reading Navigator" is a reading intervention program developed by McGraw-Hill Education to raise reading competencies of struggling middle school and high school students. The publishers state that the program "motivate[s] reluctant readers with highly engaging online and print-based content written exclusively for adolescents" ("Jamestown Reading Navigator," 2009). The current study tests two research questions: (1) Do students participating in the "Jamestown Reading Navigator" program attain higher reading achievement scores than comparable students who are not participating in "JRN"?; (2) Are there discernible differences in the size of impact on children of different gender, ethnicity, disability, English learner status, and pretest score? This study demonstrates that "JRN" had a positive impact on student achievement in reading for students in the Miami Dade Public School District's Intensive Reading classes. It also indicates a potential for "JRN" to benefit students with disabilities. Data availability limited the impact evaluation to the first year of program implementation and precludes assessing "JRN's" long term benefits. (Contains 3 tables and 3 figures.)