Mainstem Rivers of the Conterminous United States (ver. 2.0, February 2023)
Mainstem rivers are the backbone of a connected network of hydrologic units that cover the landscape. A mainstem connects a headwater source area to an outlet. This data release identifies the same mainstem paths in hydrographic datasets for the conterminous US.
The Mainstems dataset includes cross walks between …