Arco Iris is a public charter school in Beaverton, Oregon (Portland area).
The language program is ~75/25 (Spanish/English) for grades 1-3 and ~50/50 for grades 4 and above.
Opened in 2010 serving grades 1-4. In 2012-2013 it will serve grades 1-6, adding a grade each year until K-8.
Spanish is the target language and English is taught by a separate teacher.
Singapore Math is the math curriculum.