The Gallatin Valley is rapidly filling in%2C with scattershot sprawl sweeping across rural areas of the county. %E2%80%9CBefore a baby born this year graduates from the new high school in Bozeman%2C she will watch the valley where she%E2%80%99s growing up add the equivalent of a Boulder%2C Colorado to the landscape%2C%26quot%3B Randy Carpenter says. Photo courtesy EcoFlight %28ecoflight.org%29