About this map: The historic layer relies on original 1890s USGS topographic maps. Because 19th-century surveyors didn't have GPS, laying these old maps perfectly flat over a modern satellite view causes slight alignment quirks. You might notice some streets don't line up exactly, but the larger story—the total remaking of the Trinity River—is unmistakable. You can see this in the river channel straightened out and moved in downtown Dallas, the urban sprawl, and the reservoirs on its branches.

Texas TEKS-aligned teaching materials.

There are lesson plans and packets for grades 4, 7, and 11. Each of these packets was designed and written by Steve Sonksen. Steve was the 2013 Texas Social Studies Teacher of the year.

Thank you, Steve!