| Secesh River | |
| Pushpin Map: | USA Idaho#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of the mouth of the Secesh River in Idaho |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Idaho |
| Length: | 27miles |
| Discharge1 Location: | Secesh Meadows[1] |
| Discharge1 Min: | 33cuft/s |
| Discharge1 Avg: | 194cuft/s[2] |
| Discharge1 Max: | 2500cuft/s |
| Source1: | Confluence of Lake Creek and Summit Creek |
| Source1 Location: | Burgdorf, Idaho County |
| Source1 Coordinates: | 45.2758°N -115.9186°W[3] |
| Source1 Elevation: | 6099feet |
| Mouth: | South Fork Salmon River |
| Mouth Location: | Browns Camp, Valley County |
| Mouth Coordinates: | 45.025°N -115.7075°W |
| Mouth Elevation: | 3629feet |
| Tributaries Left: | Lake Creek (Idaho), Piah Creek, Warm Springs Creek (Idaho) |
| Tributaries Right: | Summit Creek, Loon Creek, Lick Creek (Idaho) |
The Secesh River is a 27miles[4] tributary of the South Fork Salmon River in Idaho and Valley Counties, Idaho in the United States. The river begins at the confluence of Lake Creek and Summit Creek near the unincorporated community of Burgdorf and flows generally southeast, through Secesh Meadows and a series of canyons, emptying into the South Fork near Browns Camp.[5]
The river drains a remote wilderness watershed in the Salmon River Mountains. Situated in the Payette National Forest, it is a popular destination for whitewater boating, and its confluence with the South Fork also marks the beginning of the South Fork's main whitewater run.