There are several USGS gages on the Penobscot River.

In additional, the National Weather Services' "Advanced Hydrological Prediction" Services provides the following forecasts:


The USGS gauge at Eddington provides the best guidance for those paddling the stretch of the river between Old Town and Brewer, which has the most difficult rapids:

Less than 3': Low water. Rapids may be scratchy, but are less likely to swamp open boats. Careful route finding may be necessary. 

3 to 7 feet: Medium Water: Best flows for clean lines, but may be challenging for loaded boat. Canoes should be outfitted with flotation. Portaging may be appropriate, especially early season.

Greater than 7 feet: High water. Long swims possible.

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