In recent years, there has been increasing attention to the importance of interagency collaboration for improving community well-being, environmental and public health, and educational outcomes. This article uses a mixed-methods approach including network analysis to examine the changes in interagency collaboration in one site funded by the Safe Schools/Healthy Students Initiative (SS/HS). Results of the evaluation demonstrated that although intraproject collaboration peaked in the middle of the grant and began to decline during the last year, interagency collaborations continued to grow during the last year of the grant. These results illustrate how network data can easily be collected and used to assess the development of interagency relationships. (Contains 2 tables and 3 figures.)