Building on theories of cross linguistic transfer, reading proficiency of Spanish-speaking Emerging Bilinguals may be enhanced by providing tiered instruction through multitiered systems of support. To realize the benefits of this systems-level framework, technically adequate universal screening assessments to support teachers' decision making are needed to provide educators with information about students' English and Spanish literacy skills. The purpose of this study is to investigate the technical adequacy of the ISIP Español universal screening assessment with Spanish "and" English outcome measures for Grades 3-5. Results suggested moderate concurrent and predictive validity evidence for the criterion assessments in both languages while classification accuracy results indicate comparable predictive utility of the Spanish screener for English and Spanish versions of the state achievement test but better predictive utility for a standardized achievement test of Spanish reading. Practical implications and directions for future research are discussed.