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This probabilistic forecast is issued by the Northeast River Forecast Center.
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About this graph
Forecasts for the Penobscot River above Grindstone are issued routinely year-round.
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Downstream Gauge Downstream Gauge - at West Enfield
Zoom Level:16
Flood Categories (in feet)
Major Flood Stage: 16
Moderate Flood Stage: 15
Flood Stage: 13
Action Stage: 11
Low Stage (in feet): -9999

Historic Crests
(1) 16.90 ft on 04/30/1923
(2) 15.02 ft on 04/30/2008
(3) 14.71 ft on 04/29/1973
(4) 14.30 ft on 09/29/1909
(5) 14.00 ft on 03/20/1936
(6) 12.50 ft on 04/28/2019
(7) 12.49 ft on 12/14/2010
(8) 12.22 ft on 04/27/2018
(9) 11.87 ft on 04/16/2014
(10) 11.22 ft on 10/19/2022
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 11.22 ft on 10/19/2022
(2) 10.70 ft on 04/14/2020
(3) 12.50 ft on 04/28/2019
(4) 12.22 ft on 04/27/2018
(5) 11.87 ft on 04/16/2014
(6) 12.49 ft on 12/14/2010
(7) 15.02 ft on 04/30/2008
(8) 10.41 ft on 11/17/2007
(9) 14.71 ft on 04/29/1973
(10) 14.00 ft on 03/20/1936
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 4.25 ft on 10/10/2018
(2) 4.30 ft on 10/16/2016
(3) 4.36 ft on 10/07/2020
(4) 4.38 ft on 09/23/2019
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Gauge LocationGauge Map Marker
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
16 Widespread flooding of State Route 11 from Hay Brook to Grindstone to Medway. Numerous homes, camps and campgrounds inundated. Flooding similar to April 1923. Penobscot River Trails inaccessible. Widespread flooding upstream to the Swift Brook Road in T3 R7 Wels.
15 State Route 11 flooded and impassable. Homes and camps inundated. Logging roads west and near the river will be flooded. Hathaway Road flooded near the river.
13 State Route 11 flooded in places. Homes and camps threatened. Significant flooding of Penobscot River Trails. Moderate backwater flooding of Mud & Hay Brooks.
12 State Route 11 gets water across the road, but passable. Minor flooding of Penobscot River Trails with some trails being cut off. Backwater flooding of Mud, Hay and Tots Brooks.
11 River rising with minor lowland flooding along the Penobscot River Trails.
(1) Gage House
(2) Old Gage House 750 Downstream of New Gage
(3) Bubbler Pipe
(4) Crest-Stage Gage
(5) Gage House Looking South

Other Real-time and/or Archive Data Sources:

Additional Information Collapse
Potential River Levels
Used to Estimate the Chance of Flooding and the Range of Possible River Levels
10 Day (HEFS) 7 Day (NAEFS) 7 Day (GEFS)
HEFS Ensemble NAEFS Ensemble GEFS Ensemble

Note: Use the official hydrograph at the top of this web page for river levels within the next 72 hours.

Click individual graphics to enlarge.

Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
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Caribou, ME 04736
(207) 492-0170
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Page last modified: 2-Nov-2020 7:30 PM
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