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Housatonic River
| States | Connecticut (85 mi), Massachusetts (54 mi) |
| Length | 139.0 miles |
| Watershed Length* | 586 miles |
| Mouth | Long Island Sound ⤏ Atlantic Ocean |
| GNIS | 212670 |
Tributaries
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| Name | Distance from Mouth (miles) | Length (miles) | Watershed Length (miles) |
|---|---|---|---|
| Blackberry River | 84 | 10 | 22 |
| Eightmile Brook | 19 | 13 | 13 |
| Farmill River | 7 | 12 | 12 |
| Green River | 100 | 21 | 21 |
| Hollenbeck River | 78 | 18 | 18 |
| Hop Brook | 121 | 12 | 12 |
| Housatonic River - East Branch | 139 | 19 | 19 |
| Housatonic River - West Branch | 139 | 7 | 13 |
| Hubbard Brook | 94 | 9 | 21 |
| Konkapot River | 85 | 22 | 22 |
| Naugatuck River | 12 | 40 | 70 |
| Pomperaug River | 26 | 13 | 34 |
| Pootatuck River | 27 | 11 | 11 |
| Shepaug River | 31 | 26 | 47 |
| Still River | 40 | 25 | 25 |
| Tenmile River | 52 | 16 | 62 |
| West Aspetuck River | 43 | 15 | 15 |
| Williams River | 106 | 11 | 11 |
* Note: Watershed is mostly rivers/streams 15+ miles in length.
Data from United States Geological Survey