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Penobscot River
| States | Maine |
| Length | 109.4 miles |
| Watershed Length* | 1,818 miles |
| Mouth | Atlantic Ocean |
| GNIS | 573182 |
Tributaries
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| Name | Distance from Mouth (miles) | Length (miles) | Watershed Length (miles) |
|---|---|---|---|
| Great Works Stream | 43 | 23 | 23 |
| Hemlock Stream | 56 | 16 | 16 |
| Kenduskeag Stream | 32 | 42 | 42 |
| Marsh Stream | 16 | 34 | 48 |
| Mattamiscontis Stream | 79 | 15 | 30 |
| Mattawamkeag River | 97 | 51 | 391 |
| Medunkeunk Stream | 84 | 19 | 19 |
| Olamon Stream | 61 | 23 | 23 |
| Passadumkeag River | 66 | 48 | 48 |
| Penobscot River - East Branch | 109 | 75 | 204 |
| Penobscot River - West Branch | 109 | 116 | 301 |
| Piscataquis River | 70 | 65 | 386 |
| Salmon Stream | 104 | 25 | 25 |
| Souadabscook Stream | 26 | 21 | 21 |
| Stillwater River | 40 | 11 | 104 |
| Sunkhaze Stream | 49 | 27 | 27 |
* Note: Watershed is mostly rivers/streams 15+ miles in length.
Data from United States Geological Survey