Is Flow Reading Fluency® designed for specific grade levels?

Because Flow Reading Fluency is based on Lexile® measures, the program is not designed around a specific range of grade levels. The passages range from Lexile® measures of 150L (in Level 1) to 1100L (in level 10). Students in a particular grade level can have a wide range of Lexile® reader measures. The chart below shows the typical ranges for each grade level.