| Hydrologic unit name
| Hydrologic unit No.
| Counties and tribal lands contained in hydrologic unit and within the range of ESU
1 2
| Dams (reservoirs)
|
|---|
| Mattole | 18010107 | Humboldt (CA), Mendocino (CA)
| |
| South Fork Eel | 18010106 | Mendocino (CA), Humboldt (CA)—Laytonville Rancheria; Sherwood Valley Rancheria
| |
| Lower Eel | 18010105 | Mendocino (CA), Humboldt (CA), Trinity (CA)
| |
| Middle Fork Eel | 18010104 | Mendocino (CA), Trinity (CA), Glenn (CA), Lake (CA)—Round Valley Reservation
| |
| Upper Eel | 18010103 | Mendocino (CA), Glenn (CA), Lake (CA) | Scott Dam (Lake Pillsbury).
|
| Mad-Redwood | 18010102 | Humboldt (CA), Trinity (CA)—Big Lagoon Rancheria; Blue Lake Rancheria
| |
| Smith | 18010101 | Del Norte (CA), Curry (OR)—Elk Valley Rancheria; Smith River Rancheria
| |
| South Fork Trinity | 18010212 | Humboldt (CA), Trinity (CA)
| |
| Trinity | 18010211 | Humboldt (CA), Trinity (CA)—Hoopa Valley Reservation | Lewiston Dam (Lewiston Reservoir).
|
| Salmon | 18010210 | Siskiyou (CA)
| |
| Lower Klamath | 18010209 | Del Norte (CA), Humboldt (CA), Siskiyou (CA)—Karuk Reservation; Resighini Rancheria; Yurok Reservation
| |
| Scott | 18010208 | Siskiyou (CA)—Quartz Valley Reservation
| |
| Shasta | 18010207 | Siskiyou (CA) | Dwinnell Dam (Dwinnell Reservoir).
|
| Upper Klamath | 18010206 | Siskiyou (CA), Jackson (OR) | Irongate Dam (Irongate Reservoir).
|
| Chetco | 17100312 | Curry (OR), Del Norte (CA)
| |
| Illinois | 17100311 | Curry (OR), Josephine (OR), Del Norte (CA) | Selmac Lake Dam (Lake Selmac).
|
| Lower Rogue | 17100310 | Curry (OR), Josephine (OR), Jackson (OR)
| |
| Applegate | 17100309 | Josephine (OR), Jackson (OR), Siskiyou (CA) | Applegate Dam (Applegate Reservoir).
|
| Middle Rogue | 17100308 | Josephine (OR), Jackson (OR) | Emigrant Lake Dam (Emigrant Lake).
|
| Upper Rogue | 17100307 | Jackson (OR), Klamath (OR), Douglas (OR) | Agate Lake Dam (Agate Lake); Fish Lake Dam (Fish Lake); Willow Lake Dam (Willow Lake); Lost Creek Dam (Lost Creek Reservoir).
|
| Sixes | 17100306 | Curry (OR)
| |