Oregon River Map showing major rivers in Oregon, River start and end point, county boundaries.
River Map of Oregon State
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Rivers and Waterways in Oregon
Oregon鈥檚 river systems are shaped by mountains, valleys, and coastal ranges, with most waterways draining into the Pacific Ocean. Western rivers flow quickly from the Cascade Range to the coast, while eastern Oregon includes rivers that drain into the Columbia River system or internal basins. Snowmelt from the mountains plays a major role in river flow. The state also has many reservoirs and natural lakes that support irrigation, hydropower, fisheries, and recreation across its diverse landscapes.
Major Rivers in Oregon
| River | Length (Approx.) | Region | Flows Into |
|---|---|---|---|
| Columbia River | 1,243 mi | North | Pacific Ocean |
| Willamette River | 187 mi | West | Columbia River |
| Snake River | 1,078 mi | East | Columbia River |
| Rogue River | 215 mi | Southwest | Pacific Ocean |
| Umpqua River | 111 mi | Southwest | Pacific Ocean |
| Deschutes River | 252 mi | Central | Columbia River |
| John Day River | 284 mi | North | Columbia River |
| Santiam River | 57 mi | West | Willamette River |
| Clackamas River | 83 mi | West | Willamette River |
| McKenzie River | 90 mi | West | Willamette River |
| Siuslaw River | 110 mi | West | Pacific Ocean |
| Coos River | 36 mi | Southwest | Pacific Ocean |
| Coquille River | 121 mi | Southwest | Pacific Ocean |
| Nehalem River | 119 mi | Northwest | Pacific Ocean |
| Grande Ronde River | 185 mi | Northeast | Snake River |
| Wallowa River | 50 mi | Northeast | Grande Ronde River |
| Malheur River | 190 mi | East | Snake River |
| Owyhee River | 346 mi | East | Snake River |
Major Lakes in Oregon
| Lake | Type | Region |
|---|---|---|
| Crater Lake | Natural lake | South |
| Klamath Lake | Natural lake | South |
| Upper Klamath Lake | Natural lake | South |
| Detroit Lake | Reservoir | West |
| Odell Lake | Natural lake | Central |
| Wallowa Lake | Natural lake | Northeast |
| Lake Billy Chinook | Reservoir | Central |
| Fern Ridge Reservoir | Reservoir | West |
| Lookout Point Lake | Reservoir | West |
| Green Peter Lake | Reservoir | West |
Major River Basins in Oregon
Oregon鈥檚 river basins are primarily part of the Columbia River system, with additional coastal basins draining directly into the Pacific Ocean. Eastern areas also include internal basins that do not reach the ocean.
- Columbia River Basin
- Willamette River Basin
- Snake River Basin
- Deschutes River Basin
- Rogue River Basin
- Umpqua River Basin
- John Day River Basin
- Klamath River Basin
- Owyhee River Basin
Oregon Rivers Facts
| State | Oregon |
| Total Rivers & Streams | 110,000+ miles of streams |
| Major Rivers | Columbia, Willamette, Snake, Rogue |
| Total Waterway Length | 115,000+ miles |
| Main Drainage | Pacific Ocean & Columbia River System |
| Longest River | Columbia River |
| Shortest River | Coos River |
| Major River Basins | 9 Primary Basins |
| Primary Outlet | Pacific Ocean |
| Key Uses | Hydropower, irrigation, fisheries, recreation |
| Longest River Within State | Willamette River |
| Number of River Basins | 8鈥�10 Basins |
| Major Reservoirs | Detroit Lake, Fern Ridge, Lookout Point Lake |
| Primary Water Source | Surface water and snowmelt |
River Map OF U.S. 50 States - Click on State name for its River Map
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