Turn bridge design into an engaging STEM engineering challenge! Students plan, build, test, and redesign a paper rainbow bridge that holds weight while learning structure, stability, and force. This printable activity guides Grades 3–5 through real engineering thinking with vocabulary, testing logs, reflection, and creative writing. Perfect for STEM blocks, centers, or enrichment. ✅ Who Is This Resource For?This resource is ideal for: • Grades 3–5 classrooms learning engineering design • Teach