St. Joe River
| Saint Joe River | |
 Saint Joe River in the St. Joe National Forest
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| Country | United States |
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| State | Idaho |
| Counties | Shoshone County, Benewah County, Kootenai County |
| Source | Northern Bitterroot Range |
| - location | southwest of Superior, Montana, Shoshone County, Idaho |
| - elevation | 6,487 ft (1,977 m) |
| - coordinates | 47°01′07″N 115°04′58″W / 47.01861°N 115.08278°W |
| Mouth | Coeur d'Alene Lake |
| - location | north of Heyburn State Park, Kootenai County, Idaho |
| - elevation | 2,129 ft (649 m) |
| - coordinates | 47°23′35″N 116°45′15″W / 47.39306°N 116.75417°WCoordinates: 47°23′35″N 116°45′15″W / 47.39306°N 116.75417°W |
| Length | 140 mi (225 km) |
| Basin | 1,850 sq mi (4,791 km2) |
  Location of the mouth of the Saint Joe River in Idaho
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The Saint Joe River (sometimes abbreviated St. Joe River) is a 140-mile (225 km) longtributary of Coeur d'Alene Lake in northern Idaho. Beginning at an elevation of 6,487 feet (1,977 m) in the Northern Bitterroot Range of eastern Shoshone County, it flows generally west through the Saint Joe River Valley and the communities of Avery and Calder. Past Calder, it flows into Benewah County and through the town of St. Maries, where it receives its largest tributary, the Saint Maries River. It then turns northwest, passing through Heyburn State Park before reaching its mouth just north of the Kootenai County line. Much of the river's route through Heyburn State Park is partially flooded due to raised water levels from Post Falls Dam on the Spokane River below Coeur d'Alene Lake. With a mouth elevation of 2,129 feet (648.9 m), it has been described as the highest navigable river in the world.
In 1978, 66.3 miles (107 km) of the river were protected by the National Wild and Scenic Rivers System, with 26.6 miles (42.8 km) designated as wild and another 39.7 miles (63.9 km) designated as recreational.
The Saint Joe River drains 1,850 square miles (4,791 km2) of the Idaho Panhandle. It is part of the Spokane River watershed, which in turn is part of the Columbia River basin. About 68 percent is owned by the United States Forest Service (the St. Joe National Forest), 4 percent is owned by the Bureau of Land Management, 2 percent is owned by the State of Idaho, and the rest is privately owned.
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