| Mad River | |
| Country | United States |
|---|---|
| State | Washington |
| County | Chelan |
| Source | Cascade Range |
| - coordinates | [1] |
| Mouth | Entiat River |
| - coordinates | [1] |
| Basin | 92.4 sq mi (239 km2) [2] |
| Discharge | for river mile 0.4 at Ardenvoir |
| - average | 76.7 cu ft/s (2 m3/s) [2] |
| - max | 659 cu ft/s (19 m3/s) |
| - min | 9.0 cu ft/s (0 m3/s) |
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Location of the mouth of the Mad River in Washington
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The Mad River is a river in the U.S. state of Washington. It rises in the Cascade Mountains and flows southeast to join the Entiat River. It is part of the Columbia River basin, being a tributary of the Entiat River, which empties into the Columbia River.