There are five coverages provided, covering the same geographical area as the data on the disc. The State, County, HUC and Reach1 coverages are organized by state, while the Stations coverage is for the entire set of states on the disc.
| Coverage | Type | Source | Scale |
|---|---|---|---|
| State | Polygon | USGS | 1:2M |
| County | Polygon | USGS | 1:2M |
| HUC | Polygon | USGS | 1:2M |
| Reach 1 | Arc | USGS/EPA | 1:500,000 |
| Stations | Point | data |