Watersheds
A watershed is the land that drains to one river system. Ohio only for now; more states will follow.
Watersheds on the map
- Tinted: with a result; tints only tell neighbours apart
- Striped: not enough records yet
Each shape is the Ohio part of one watershed.
Every watershed
| Watershed | HUC8 | Species with a result |
|---|---|---|
| Cuyahoga | HUC8 04110002 · | 1,034 species with a result |
| Upper Scioto | HUC8 05060001 · | 1,011 species with a result |
| Little Miami | HUC8 05090202 · | 878 species with a result |
| Tuscarawas | HUC8 05040001 · | 700 species with a result |
| Lower Great Miami, Indiana, OhioOhio part only | HUC8 05080002 · | 621 species with a result |
| Hocking | HUC8 05030204 · | 605 species with a result |
| Black-Rocky | HUC8 04110001 · | 598 species with a result |
| Ashtabula-Chagrin | HUC8 04110003 · | 534 species with a result |
| Upper Great Miami, Indiana, Ohio | HUC8 05080001 · | 466 species with a result |
| Middle Ohio-LaugheryOhio part only | HUC8 05090203 · | 465 species with a result |
| Lower Maumee | HUC8 04100009 · | 351 species with a result |
| Walhonding | HUC8 05040003 · | 328 species with a result |
| Cedar-Portage | HUC8 04100010 · | 283 species with a result |
| Lower Scioto | HUC8 05060002 · | 278 species with a result |
| MahoningOhio part only | HUC8 05030103 · | 277 species with a result |
| Lake ErieOhio part only | HUC8 04260000 · | 250 species with a result |
| Ohio Brush-WhiteoakOhio part only | HUC8 05090201 · | 244 species with a result |
| Mohican | HUC8 05040002 · | 230 species with a result |
| Licking | HUC8 05040006 · | 191 species with a result |
| Sandusky | HUC8 04100011 · | 184 species with a result |
| Ottawa-StonyOhio part only | HUC8 04100001 · | 151 species with a result |
| Paint | HUC8 05060003 · | 130 species with a result |
| Blanchard | HUC8 04100008 · | 128 species with a result |
| Grand | HUC8 04110004 · | 115 species with a result |
| Raccoon-SymmesOhio part only | HUC8 05090101 · | 90 species with a result |
| Huron-Vermilion | HUC8 04100012 · | 89 species with a result |
| Upper OhioOhio part only | HUC8 05030101 · | 50 species with a result |
| AuglaizeOhio part only | HUC8 04100007 · | 46 species with a result |
| Chautauqua-ConneautOhio part only | HUC8 04120101 · | 42 species with a result |
| WhitewaterOhio part only | HUC8 05080003 · | 27 species with a result |
| Muskingum | HUC8 05040004 · | 26 species with a result |
| Little Muskingum-Middle IslandOhio part only | HUC8 05030201 · | 16 species with a result |
| Wills | HUC8 05040005 · | 13 species with a result |
| Upper Ohio-ShadeOhio part only | HUC8 05030202 · | 12 species with a result |
| Little Scioto-TygartsOhio part only | HUC8 05090103 · | 7 species with a result |
| Upper Ohio-WheelingOhio part only | HUC8 05030106 · | 7 species with a result |
| TiffinOhio part only | HUC8 04100006 · | 5 species with a result |
| Upper WabashOhio part only | HUC8 05120101 · | 5 species with a result |
| ShenangoOhio part only | HUC8 05030102 · | 4 species with a result |
| St. MarysOhio part only | HUC8 04100004 · | 4 species with a result |
| St. JosephOhio part only | HUC8 04100003 · | 3 species with a result |
| MississinewaOhio part only | HUC8 05120103 · | Not enough records yet |
| RaisinOhio part only | HUC8 04100002 · | Not enough records yet |
| Upper MaumeeOhio part only | HUC8 04100005 · | Not enough records yet |