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Hydrograph River at a Glance Download
Penobscot River above Grindstone Stage (ft)Flow (kcfs)Highest Observation: 6.39 ft at 2:00AM May 22, 2024Highest Observation: 6.39 ft at 2:15AM May 22, 2024Highest Observation: 6.39 ft at 2:30AM May 22, 2024Highest Observation: 6.39 ft at 2:45AM May 22, 2024Observed: 6.38 ft at 3:00AM May 22, 2024Observed: 6.38 ft at 3:15AM May 22, 2024Observed: 6.37 ft at 3:30AM May 22, 2024Observed: 6.37 ft at 3:45AM May 22, 2024Observed: 6.36 ft at 4:00AM May 22, 2024Observed: 6.36 ft at 4:15AM May 22, 2024Observed: 6.35 ft at 4:30AM May 22, 2024Observed: 6.34 ft at 4:45AM May 22, 2024Observed: 6.33 ft at 5:00AM May 22, 2024Observed: 6.32 ft at 5:15AM May 22, 2024Observed: 6.32 ft at 5:30AM May 22, 2024Observed: 6.31 ft at 5:45AM May 22, 2024Observed: 6.3 ft at 6:00AM May 22, 2024Observed: 6.29 ft at 6:15AM May 22, 2024Observed: 6.27 ft at 6:30AM May 22, 2024Observed: 6.26 ft at 6:45AM May 22, 2024Observed: 6.25 ft at 7:00AM May 22, 2024Observed: 6.24 ft at 7:15AM May 22, 2024Observed: 6.23 ft at 7:30AM May 22, 2024Observed: 6.21 ft at 7:45AM May 22, 2024Observed: 6.2 ft at 8:00AM May 22, 2024Observed: 6.19 ft at 8:15AM May 22, 2024Observed: 6.17 ft at 8:30AM May 22, 2024Observed: 6.16 ft at 8:45AM May 22, 2024Observed: 6.15 ft at 9:00AM May 22, 2024Observed: 6.13 ft at 9:15AM May 22, 2024Observed: 6.12 ft at 9:30AM May 22, 2024Observed: 6.11 ft at 9:45AM May 22, 2024Observed: 6.1 ft at 10:00AM May 22, 2024Observed: 6.08 ft at 10:15AM May 22, 2024Observed: 6.07 ft at 10:30AM May 22, 2024Observed: 6.06 ft at 10:45AM May 22, 2024Observed: 6.04 ft at 11:00AM May 22, 2024Observed: 6.04 ft at 11:15AM May 22, 2024Observed: 6.02 ft at 11:30AM May 22, 2024Observed: 6.01 ft at 11:45AM May 22, 2024Observed: 6 ft at 12:00PM May 22, 2024Observed: 5.99 ft at 12:15PM May 22, 2024Observed: 5.98 ft at 12:30PM May 22, 2024Observed: 5.97 ft at 12:45PM May 22, 2024Observed: 5.96 ft at 1:00PM May 22, 2024Observed: 5.95 ft at 1:15PM May 22, 2024Observed: 5.94 ft at 1:30PM May 22, 2024Observed: 5.93 ft at 1:45PM May 22, 2024Observed: 5.92 ft at 2:00PM May 22, 2024Observed: 5.91 ft at 2:15PM May 22, 2024Observed: 5.9 ft at 2:30PM May 22, 2024Observed: 5.9 ft at 2:45PM May 22, 2024Observed: 5.89 ft at 3:00PM May 22, 2024Observed: 5.88 ft at 3:15PM May 22, 2024Observed: 5.88 ft at 3:30PM May 22, 2024Observed: 5.87 ft at 3:45PM May 22, 2024Observed: 5.86 ft at 4:00PM May 22, 2024Observed: 5.86 ft at 4:15PM May 22, 2024Observed: 5.85 ft at 4:30PM May 22, 2024Observed: 5.84 ft at 4:45PM May 22, 2024Observed: 5.84 ft at 5:00PM May 22, 2024Observed: 5.83 ft at 5:15PM May 22, 2024Observed: 5.83 ft at 5:30PM May 22, 2024Observed: 5.82 ft at 5:45PM May 22, 2024Observed: 5.82 ft at 6:00PM May 22, 2024Observed: 5.81 ft at 6:15PM May 22, 2024Observed: 5.81 ft at 6:30PM May 22, 2024Observed: 5.8 ft at 6:45PM May 22, 2024Observed: 5.8 ft at 7:00PM May 22, 2024Observed: 5.8 ft at 7:15PM May 22, 2024Observed: 5.79 ft at 7:30PM May 22, 2024Observed: 5.79 ft at 7:45PM May 22, 2024Observed: 5.78 ft at 8:00PM May 22, 2024Observed: 5.78 ft at 8:15PM May 22, 2024Observed: 5.78 ft at 8:30PM May 22, 2024Observed: 5.78 ft at 8:45PM May 22, 2024Observed: 5.77 ft at 9:00PM May 22, 2024Observed: 5.77 ft at 9:15PM May 22, 2024Observed: 5.77 ft at 9:30PM May 22, 2024Observed: 5.77 ft at 9:45PM May 22, 2024Observed: 5.76 ft at 10:00PM May 22, 2024Observed: 5.76 ft at 10:15PM May 22, 2024Observed: 5.76 ft at 10:30PM May 22, 2024Observed: 5.75 ft at 10:45PM May 22, 2024Observed: 5.75 ft at 11:00PM May 22, 2024Observed: 5.75 ft at 11:15PM May 22, 2024Observed: 5.75 ft at 11:30PM May 22, 2024Observed: 5.74 ft at 11:45PM May 22, 2024Observed: 5.74 ft at 12:00AM May 23, 2024Observed: 5.74 ft at 12:15AM May 23, 2024Observed: 5.74 ft at 12:30AM May 23, 2024Observed: 5.74 ft at 12:45AM May 23, 2024Observed: 5.73 ft at 1:00AM May 23, 2024Observed: 5.73 ft at 1:15AM May 23, 2024Observed: 5.73 ft at 1:30AM May 23, 2024Observed: 5.73 ft at 1:45AM May 23, 2024Observed: 5.73 ft at 2:00AM May 23, 2024Observed: 5.73 ft at 2:15AM May 23, 2024Observed: 5.72 ft at 2:30AM May 23, 2024Observed: 5.72 ft at 2:45AM May 23, 2024Observed: 5.72 ft at 3:00AM May 23, 2024Observed: 5.72 ft at 3:15AM May 23, 2024Observed: 5.72 ft at 3:30AM May 23, 2024Observed: 5.71 ft at 3:45AM May 23, 2024Observed: 5.72 ft at 4:00AM May 23, 2024Observed: 5.71 ft at 4:15AM May 23, 2024Observed: 5.71 ft at 4:30AM May 23, 2024Observed: 5.71 ft at 4:45AM May 23, 2024Observed: 5.71 ft at 5:00AM May 23, 2024Observed: 5.71 ft at 5:15AM May 23, 2024Observed: 5.7 ft at 5:30AM May 23, 2024Observed: 5.7 ft at 5:45AM May 23, 2024Observed: 5.7 ft at 6:00AM May 23, 2024Observed: 5.7 ft at 6:15AM May 23, 2024Observed: 5.7 ft at 6:30AM May 23, 2024Observed: 5.7 ft at 6:45AM May 23, 2024Observed: 5.7 ft at 7:00AM May 23, 2024Observed: 5.7 ft at 7:15AM May 23, 2024Observed: 5.7 ft at 7:30AM May 23, 2024Observed: 5.7 ft at 7:45AM May 23, 2024Observed: 5.69 ft at 8:00AM May 23, 2024Observed: 5.69 ft at 8:15AM May 23, 2024Observed: 5.69 ft at 8:30AM May 23, 2024Observed: 5.69 ft at 8:45AM May 23, 2024Observed: 5.69 ft at 9:00AM May 23, 2024Observed: 5.69 ft at 9:15AM May 23, 2024Observed: 5.69 ft at 9:30AM May 23, 2024Observed: 5.69 ft at 9:45AM May 23, 2024Observed: 5.7 ft at 10:00AM May 23, 2024Observed: 5.71 ft at 10:15AM May 23, 2024Observed: 5.71 ft at 10:30AM May 23, 2024Observed: 5.7 ft at 10:45AM May 23, 2024Observed: 5.7 ft at 11:00AM May 23, 2024Observed: 5.7 ft at 11:15AM May 23, 2024Observed: 5.7 ft at 11:30AM May 23, 2024Observed: 5.7 ft at 11:45AM May 23, 2024Observed: 5.7 ft at 12:00PM May 23, 2024Observed: 5.69 ft at 12:15PM May 23, 2024Observed: 5.69 ft at 12:30PM May 23, 2024Observed: 5.69 ft at 12:45PM May 23, 2024Observed: 5.69 ft at 1:00PM May 23, 2024Observed: 5.69 ft at 1:15PM May 23, 2024Observed: 5.69 ft at 1:30PM May 23, 2024Observed: 5.68 ft at 1:45PM May 23, 2024Observed: 5.68 ft at 2:00PM May 23, 2024Observed: 5.68 ft at 2:15PM May 23, 2024Observed: 5.68 ft at 2:30PM May 23, 2024Observed: 5.68 ft at 2:45PM May 23, 2024Observed: 5.68 ft at 3:00PM May 23, 2024Observed: 5.68 ft at 3:15PM May 23, 2024Observed: 5.68 ft at 3:30PM May 23, 2024Observed: 5.67 ft at 3:45PM May 23, 2024Observed: 5.67 ft at 4:00PM May 23, 2024Observed: 5.68 ft at 4:15PM May 23, 2024Observed: 5.68 ft at 4:30PM May 23, 2024Observed: 5.67 ft at 4:45PM May 23, 2024Observed: 5.67 ft at 5:00PM May 23, 2024Observed: 5.67 ft at 5:15PM May 23, 2024Observed: 5.68 ft at 5:30PM May 23, 2024Observed: 5.68 ft at 5:45PM May 23, 2024Observed: 5.68 ft at 6:00PM May 23, 2024Observed: 5.68 ft at 6:15PM May 23, 2024Observed: 5.69 ft at 6:30PM May 23, 2024Observed: 5.69 ft at 6:45PM May 23, 2024Observed: 5.69 ft at 7:00PM May 23, 2024Observed: 5.7 ft at 7:15PM May 23, 2024Observed: 5.71 ft at 7:30PM May 23, 2024Observed: 5.71 ft at 7:45PM May 23, 2024Observed: 5.72 ft at 8:00PM May 23, 2024Observed: 5.72 ft at 8:15PM May 23, 2024Observed: 5.73 ft at 8:30PM May 23, 2024Observed: 5.73 ft at 8:45PM May 23, 2024Observed: 5.74 ft at 9:00PM May 23, 2024Observed: 5.74 ft at 9:15PM May 23, 2024Observed: 5.74 ft at 9:30PM May 23, 2024Observed: 5.75 ft at 9:45PM May 23, 2024Observed: 5.75 ft at 10:00PM May 23, 2024Observed: 5.75 ft at 10:15PM May 23, 2024Observed: 5.76 ft at 10:30PM May 23, 2024Observed: 5.76 ft at 10:45PM May 23, 2024Observed: 5.76 ft at 11:00PM May 23, 2024Observed: 5.76 ft at 11:15PM May 23, 2024Observed: 5.77 ft at 11:30PM May 23, 2024Observed: 5.77 ft at 11:45PM May 23, 2024Observed: 5.77 ft at 12:00AM May 24, 2024Observed: 5.77 ft at 12:15AM May 24, 2024Observed: 5.77 ft at 12:30AM May 24, 2024Observed: 5.77 ft at 12:45AM May 24, 2024Observed: 5.77 ft at 1:00AM May 24, 2024Observed: 5.77 ft at 1:15AM May 24, 2024Observed: 5.77 ft at 1:30AM May 24, 2024Observed: 5.77 ft at 1:45AM May 24, 2024Observed: 5.77 ft at 2:00AM May 24, 2024Observed: 5.77 ft at 2:15AM May 24, 2024Observed: 5.77 ft at 2:30AM May 24, 2024Observed: 5.77 ft at 2:45AM May 24, 2024Observed: 5.77 ft at 3:00AM May 24, 2024Observed: 5.77 ft at 3:15AM May 24, 2024Observed: 5.77 ft at 3:30AM May 24, 2024Observed: 5.77 ft at 3:45AM May 24, 2024Observed: 5.77 ft at 4:00AM May 24, 2024Observed: 5.77 ft at 4:15AM May 24, 2024Observed: 5.77 ft at 4:30AM May 24, 2024Observed: 5.78 ft at 4:45AM May 24, 2024Observed: 5.78 ft at 5:00AM May 24, 2024Observed: 5.79 ft at 5:15AM May 24, 2024Observed: 5.79 ft at 5:30AM May 24, 2024Observed: 5.79 ft at 5:45AM May 24, 2024Observed: 5.8 ft at 6:00AM May 24, 2024Observed: 5.8 ft at 6:15AM May 24, 2024Observed: 5.81 ft at 6:30AM May 24, 2024Observed: 5.81 ft at 6:45AM May 24, 2024Observed: 5.82 ft at 7:00AM May 24, 2024Observed: 5.82 ft at 7:15AM May 24, 2024Observed: 5.83 ft at 7:30AM May 24, 2024Observed: 5.84 ft at 7:45AM May 24, 2024Observed: 5.84 ft at 8:00AM May 24, 2024Observed: 5.85 ft at 8:15AM May 24, 2024Observed: 5.86 ft at 8:30AM May 24, 2024Observed: 5.86 ft at 8:45AM May 24, 2024Observed: 5.87 ft at 9:00AM May 24, 2024Observed: 5.87 ft at 9:15AM May 24, 2024Observed: 5.88 ft at 9:30AM May 24, 2024Observed: 5.88 ft at 9:45AM May 24, 2024Observed: 5.89 ft at 10:00AM May 24, 2024Observed: 5.89 ft at 10:15AM May 24, 2024Observed: 5.9 ft at 10:30AM May 24, 2024Observed: 5.9 ft at 10:45AM May 24, 2024Observed: 5.9 ft at 11:00AM May 24, 2024Observed: 5.9 ft at 11:15AM May 24, 2024Observed: 5.9 ft at 11:30AM May 24, 2024Observed: 5.91 ft at 11:45AM May 24, 2024Observed: 5.9 ft at 12:00PM May 24, 2024Observed: 5.91 ft at 12:15PM May 24, 2024Observed: 5.91 ft at 12:30PM May 24, 2024Observed: 5.91 ft at 12:45PM May 24, 2024Observed: 5.91 ft at 1:00PM May 24, 2024Observed: 5.91 ft at 1:15PM May 24, 2024Observed: 5.91 ft at 1:30PM May 24, 2024Observed: 5.91 ft at 1:45PM May 24, 2024Observed: 5.91 ft at 2:00PM May 24, 2024Observed: 5.91 ft at 2:15PM May 24, 2024Observed: 5.91 ft at 2:30PM May 24, 2024Observed: 5.9 ft at 2:45PM May 24, 2024Observed: 5.9 ft at 3:00PM May 24, 2024Observed: 5.9 ft at 3:15PM May 24, 2024Observed: 5.9 ft at 3:30PM May 24, 2024Observed: 5.9 ft at 3:45PM May 24, 2024Observed: 5.89 ft at 4:00PM May 24, 2024Observed: 5.89 ft at 4:15PM May 24, 2024Observed: 5.89 ft at 4:30PM May 24, 2024Observed: 5.89 ft at 4:45PM May 24, 2024Observed: 5.89 ft at 5:00PM May 24, 2024Observed: 5.89 ft at 5:15PM May 24, 2024Observed: 5.88 ft at 5:30PM May 24, 2024Observed: 5.89 ft at 5:45PM May 24, 2024Observed: 5.89 ft at 6:00PM May 24, 2024Observed: 5.88 ft at 6:15PM May 24, 2024Observed: 5.88 ft at 6:30PM May 24, 2024Observed: 5.88 ft at 6:45PM May 24, 2024Observed: 5.87 ft at 7:00PM May 24, 2024Observed: 5.87 ft at 7:15PM May 24, 2024Observed: 5.87 ft at 7:30PM May 24, 2024Observed: 5.87 ft at 7:45PM May 24, 2024Observed: 5.87 ft at 8:00PM May 24, 2024Observed: 5.87 ft at 8:15PM May 24, 2024Observed: 5.86 ft at 8:30PM May 24, 2024Observed: 5.86 ft at 8:45PM May 24, 2024Observed: 5.86 ft at 9:00PM May 24, 2024Observed: 5.86 ft at 9:15PM May 24, 2024Observed: 5.86 ft at 9:30PM May 24, 2024Observed: 5.85 ft at 9:45PM May 24, 2024Observed: 5.85 ft at 10:00PM May 24, 2024Observed: 5.85 ft at 10:15PM May 24, 2024Observed: 5.85 ft at 10:30PM May 24, 2024Observed: 5.85 ft at 10:45PM May 24, 2024Observed: 5.84 ft at 11:00PM May 24, 2024Observed: 5.84 ft at 11:15PM May 24, 2024Observed: 5.84 ft at 11:30PM May 24, 2024Observed: 5.84 ft at 11:45PM May 24, 2024Observed: 5.83 ft at 12:00AM May 25, 2024Observed: 5.83 ft at 12:15AM May 25, 2024Observed: 5.83 ft at 12:30AM May 25, 2024Observed: 5.83 ft at 12:45AM May 25, 2024Observed: 5.83 ft at 1:00AM May 25, 2024Highest Forecast: 6 ft 2:00AM May 25, 2024Highest Forecast: 6 ft 8:00AM May 25, 2024Forecast: 5.9 ft 2:00PM May 25, 2024Forecast: 5.9 ft 8:00PM May 25, 2024Forecast: 5.8 ft 2:00AM May 26, 2024Forecast: 5.8 ft 8:00AM May 26, 2024Forecast: 5.8 ft 2:00PM May 26, 2024Forecast: 5.7 ft 8:00PM May 26, 2024Forecast: 5.7 ft 2:00AM May 27, 2024Forecast: 5.7 ft 8:00AM May 27, 2024USGS--Water Resources of the United StatesGRNM1(plotting HGIRG) Graph Created (1:46AM May 25, 2024)ObservedForecast (issued 11:03AM May 24)Latest observed value: 5.83 ft at 1:00 AM EDT 25-May-2024. Flood Stage is 14 ft
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: NGVD29
Metadata
NOTE: Gauge reading may be affected by ice. Forecast flows are unadjusted for ice.

NOTE: Forecasts for the Penobscot River above Grindstone are issued routinely year-round.

Return to Area Map
Downstream Gauge Downstream Gauge - at West Enfield
Flood Categories (in feet)
Major Flood Stage: 17
Moderate Flood Stage: 16
Flood Stage: 14
Action Stage: 11.5
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) 14.67 ft on 12/19/2023
(5) 14.30 ft on 09/29/1909
(6) 14.00 ft on 03/20/1936
(7) 12.50 ft on 04/28/2019
(8) 12.49 ft on 12/14/2010
(9) 12.22 ft on 04/27/2018
(10) 11.87 ft on 04/16/2014
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 14.67 ft on 12/19/2023
(2) 11.22 ft on 10/19/2022
(3) 10.70 ft on 04/14/2020
(4) 12.50 ft on 04/28/2019
(5) 12.22 ft on 04/27/2018
(6) 11.87 ft on 04/16/2014
(7) 12.49 ft on 12/14/2010
(8) 15.02 ft on 04/30/2008
(9) 10.41 ft on 11/17/2007
(10) 14.71 ft on 04/29/1973
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
Zoom Level:16
KML Image
Gauge LocationGauge Map Marker
Disclaimer
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
17 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.
16 State Route 11 significantly flooded and impassable to all travel in several areas between Medway and the Penobscot River Trails in Grindstone. Homes and camps inundated. Logging roads west and near the river will be flooded. Hathaway Road flooded near the river.
14.5 State Route 11 becomes impassable between the Penobscot River Trails road and Hay Brook with significant backwater flooding. Additional flooding of State Route 11 near Frazier Road to the Grindstone Falls Rest Area. 1-2 feet of inundation of State Route 11 near the USGS gage at the railroad trestle. Low lying structures are threatened downstream to Medway.
14 State Route 11 flooded in places but remains passable. Homes and camps begin to get threatened. Significant flooding of Penobscot River Trails and unaccessable. Moderate backwater flooding of Mud & Hay Brooks.
13 Minor flooding of the flood plain through Penobscot River Trails cutting some trails off from access.
12 River rising nearing bankfull with minor floodplain flooding along the Penobscot River Trails.
Photos
(1) Gage House
(2) Old Gage House 750 Downstream of New Gage
(3) Bubbler Pipe
(4) Crest-Stage Gage
(5) Gage House Looking South
About This Location Collapse

Latitude: 45.731300° N, Longitude: 68.589300° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 14 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
Elevation
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 294.74 ft 307.74 ft Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:

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.

Resources Collapse
Hydrologic Resources Additional Resources
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
National Weather Service
Caribou Weather Forecast Office
810 Main St.
Caribou, ME 04736
(207) 492-0170
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Page last modified: 30-Oct-2020 4:10 PM
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