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| The river was named in July 1805 by Meriwether Lewis at Three Forks. The central fork of the three, it was named for U.S. Secretary of State James Madison, who would succeed Thomas Jefferson as President in 1809. |
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 | Source : | Madison Junction |  |
| Lattitude: | 44.6422233581543 | |
| Longitude: | -110.86555480957 | |
| Location: | Madison Junction | |
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 | Mouth : | | |
| Lattitude: | 45.9275016784668 | |
| Longitude: | -111.508056640625 | |
| Location: | Missouri River
Three Forks, Montana | |
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| Tributary | Lat/Lon | | | Connected | |
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