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Hydrograph River at a Glance Download
Penobscot River above Grindstone Stage (ft)Flow (kcfs)Observed: 4.92 ft at 3:15PM Feb 26, 2021Observed: 4.92 ft at 3:30PM Feb 26, 2021Observed: 4.92 ft at 3:45PM Feb 26, 2021Observed: 4.92 ft at 4:00PM Feb 26, 2021Observed: 4.92 ft at 4:15PM Feb 26, 2021Observed: 4.92 ft at 4:30PM Feb 26, 2021Observed: 4.92 ft at 4:45PM Feb 26, 2021Observed: 4.92 ft at 5:00PM Feb 26, 2021Observed: 4.92 ft at 5:15PM Feb 26, 2021Observed: 4.92 ft at 5:30PM Feb 26, 2021Observed: 4.92 ft at 5:45PM Feb 26, 2021Observed: 4.92 ft at 6:00PM Feb 26, 2021Observed: 4.92 ft at 6:15PM Feb 26, 2021Observed: 4.92 ft at 6:30PM Feb 26, 2021Observed: 4.92 ft at 6:45PM Feb 26, 2021Observed: 4.92 ft at 7:00PM Feb 26, 2021Observed: 4.93 ft at 7:15PM Feb 26, 2021Observed: 4.92 ft at 7:30PM Feb 26, 2021Observed: 4.92 ft at 7:45PM Feb 26, 2021Observed: 4.92 ft at 8:00PM Feb 26, 2021Observed: 4.92 ft at 8:15PM Feb 26, 2021Observed: 4.92 ft at 8:30PM Feb 26, 2021Observed: 4.92 ft at 8:45PM Feb 26, 2021Observed: 4.92 ft at 9:00PM Feb 26, 2021Observed: 4.92 ft at 9:15PM Feb 26, 2021Observed: 4.92 ft at 9:30PM Feb 26, 2021Observed: 4.92 ft at 9:45PM Feb 26, 2021Observed: 4.92 ft at 10:00PM Feb 26, 2021Observed: 4.92 ft at 10:15PM Feb 26, 2021Observed: 4.91 ft at 10:30PM Feb 26, 2021Observed: 4.91 ft at 10:45PM Feb 26, 2021Observed: 4.91 ft at 11:00PM Feb 26, 2021Observed: 4.91 ft at 11:15PM Feb 26, 2021Observed: 4.91 ft at 11:30PM Feb 26, 2021Observed: 4.9 ft at 11:45PM Feb 26, 2021Observed: 4.9 ft at 12:00AM Feb 27, 2021Observed: 4.9 ft at 12:15AM Feb 27, 2021Observed: 4.9 ft at 12:30AM Feb 27, 2021Observed: 4.9 ft at 12:45AM Feb 27, 2021Observed: 4.89 ft at 1:00AM Feb 27, 2021Observed: 4.89 ft at 1:15AM Feb 27, 2021Observed: 4.89 ft at 1:30AM Feb 27, 2021Observed: 4.89 ft at 1:45AM Feb 27, 2021Observed: 4.89 ft at 2:00AM Feb 27, 2021Observed: 4.89 ft at 2:15AM Feb 27, 2021Observed: 4.89 ft at 2:30AM Feb 27, 2021Observed: 4.89 ft at 2:45AM Feb 27, 2021Observed: 4.89 ft at 3:00AM Feb 27, 2021Observed: 4.89 ft at 3:15AM Feb 27, 2021Observed: 4.89 ft at 3:30AM Feb 27, 2021Observed: 4.89 ft at 3:45AM Feb 27, 2021Observed: 4.89 ft at 4:00AM Feb 27, 2021Observed: 4.89 ft at 4:15AM Feb 27, 2021Observed: 4.89 ft at 4:30AM Feb 27, 2021Observed: 4.89 ft at 4:45AM Feb 27, 2021Observed: 4.89 ft at 5:00AM Feb 27, 2021Observed: 4.89 ft at 5:15AM Feb 27, 2021Observed: 4.89 ft at 5:30AM Feb 27, 2021Observed: 4.89 ft at 5:45AM Feb 27, 2021Observed: 4.89 ft at 6:00AM Feb 27, 2021Observed: 4.9 ft at 6:15AM Feb 27, 2021Observed: 4.9 ft at 6:30AM Feb 27, 2021Observed: 4.9 ft at 6:45AM Feb 27, 2021Observed: 4.9 ft at 7:00AM Feb 27, 2021Observed: 4.9 ft at 7:15AM Feb 27, 2021Observed: 4.9 ft at 7:30AM Feb 27, 2021Observed: 4.9 ft at 7:45AM Feb 27, 2021Observed: 4.9 ft at 8:00AM Feb 27, 2021Observed: 4.9 ft at 8:15AM Feb 27, 2021Observed: 4.9 ft at 8:30AM Feb 27, 2021Observed: 4.91 ft at 8:45AM Feb 27, 2021Observed: 4.91 ft at 9:00AM Feb 27, 2021Observed: 4.91 ft at 9:15AM Feb 27, 2021Observed: 4.91 ft at 9:30AM Feb 27, 2021Observed: 4.91 ft at 9:45AM Feb 27, 2021Observed: 4.91 ft at 10:00AM Feb 27, 2021Observed: 4.91 ft at 10:15AM Feb 27, 2021Observed: 4.91 ft at 10:30AM Feb 27, 2021Observed: 4.91 ft at 10:45AM Feb 27, 2021Observed: 4.91 ft at 11:00AM Feb 27, 2021Observed: 4.91 ft at 11:15AM Feb 27, 2021Observed: 4.91 ft at 11:30AM Feb 27, 2021Observed: 4.91 ft at 11:45AM Feb 27, 2021Observed: 4.91 ft at 12:00PM Feb 27, 2021Observed: 4.92 ft at 12:15PM Feb 27, 2021Observed: 4.92 ft at 12:30PM Feb 27, 2021Observed: 4.92 ft at 12:45PM Feb 27, 2021Observed: 4.92 ft at 1:00PM Feb 27, 2021Observed: 4.92 ft at 1:15PM Feb 27, 2021Observed: 4.92 ft at 1:30PM Feb 27, 2021Observed: 4.93 ft at 1:45PM Feb 27, 2021Observed: 4.93 ft at 2:00PM Feb 27, 2021Observed: 4.93 ft at 2:15PM Feb 27, 2021Observed: 4.93 ft at 2:30PM Feb 27, 2021Observed: 4.93 ft at 2:45PM Feb 27, 2021Observed: 4.94 ft at 3:00PM Feb 27, 2021Observed: 4.94 ft at 3:15PM Feb 27, 2021Observed: 4.94 ft at 3:30PM Feb 27, 2021Observed: 4.94 ft at 3:45PM Feb 27, 2021Observed: 4.94 ft at 4:00PM Feb 27, 2021Observed: 4.95 ft at 4:15PM Feb 27, 2021Observed: 4.95 ft at 4:30PM Feb 27, 2021Observed: 4.96 ft at 7:45PM Feb 27, 2021Observed: 4.96 ft at 8:00PM Feb 27, 2021Observed: 4.96 ft at 8:15PM Feb 27, 2021Observed: 4.96 ft at 8:30PM Feb 27, 2021Observed: 4.96 ft at 8:45PM Feb 27, 2021Observed: 4.96 ft at 9:00PM Feb 27, 2021Observed: 4.96 ft at 9:15PM Feb 27, 2021Observed: 4.96 ft at 9:30PM Feb 27, 2021Observed: 4.96 ft at 9:45PM Feb 27, 2021Observed: 4.96 ft at 10:00PM Feb 27, 2021Observed: 4.96 ft at 10:15PM Feb 27, 2021Observed: 4.95 ft at 10:30PM Feb 27, 2021Observed: 4.95 ft at 10:45PM Feb 27, 2021Observed: 4.95 ft at 11:00PM Feb 27, 2021Observed: 4.96 ft at 11:15PM Feb 27, 2021Observed: 4.95 ft at 11:30PM Feb 27, 2021Observed: 4.95 ft at 11:45PM Feb 27, 2021Observed: 4.95 ft at 12:00AM Feb 28, 2021Observed: 4.95 ft at 12:15AM Feb 28, 2021Observed: 4.94 ft at 12:30AM Feb 28, 2021Observed: 4.95 ft at 12:45AM Feb 28, 2021Observed: 4.95 ft at 1:00AM Feb 28, 2021Observed: 4.95 ft at 1:15AM Feb 28, 2021Observed: 4.95 ft at 1:30AM Feb 28, 2021Observed: 4.95 ft at 1:45AM Feb 28, 2021Observed: 4.95 ft at 2:00AM Feb 28, 2021Observed: 4.95 ft at 2:15AM Feb 28, 2021Observed: 4.95 ft at 2:30AM Feb 28, 2021Observed: 4.95 ft at 2:45AM Feb 28, 2021Observed: 4.95 ft at 3:00AM Feb 28, 2021Observed: 4.95 ft at 3:15AM Feb 28, 2021Observed: 4.95 ft at 3:30AM Feb 28, 2021Observed: 4.95 ft at 3:45AM Feb 28, 2021Observed: 4.95 ft at 4:00AM Feb 28, 2021Observed: 4.95 ft at 4:15AM Feb 28, 2021Observed: 4.95 ft at 4:30AM Feb 28, 2021Observed: 4.95 ft at 4:45AM Feb 28, 2021Observed: 4.95 ft at 5:00AM Feb 28, 2021Observed: 4.95 ft at 5:15AM Feb 28, 2021Observed: 4.95 ft at 5:30AM Feb 28, 2021Observed: 4.95 ft at 5:45AM Feb 28, 2021Observed: 4.95 ft at 6:00AM Feb 28, 2021Observed: 4.95 ft at 6:15AM Feb 28, 2021Observed: 4.95 ft at 6:30AM Feb 28, 2021Observed: 4.96 ft at 6:45AM Feb 28, 2021Observed: 4.95 ft at 7:00AM Feb 28, 2021Observed: 4.96 ft at 7:15AM Feb 28, 2021Observed: 4.96 ft at 7:30AM Feb 28, 2021Observed: 4.96 ft at 7:45AM Feb 28, 2021Observed: 4.96 ft at 8:00AM Feb 28, 2021Observed: 4.96 ft at 8:15AM Feb 28, 2021Observed: 4.96 ft at 8:30AM Feb 28, 2021Observed: 4.96 ft at 8:45AM Feb 28, 2021Observed: 4.96 ft at 9:00AM Feb 28, 2021Observed: 4.96 ft at 9:15AM Feb 28, 2021Observed: 4.96 ft at 9:30AM Feb 28, 2021Observed: 4.96 ft at 9:45AM Feb 28, 2021Observed: 4.96 ft at 10:00AM Feb 28, 2021Observed: 4.96 ft at 10:15AM Feb 28, 2021Observed: 4.96 ft at 10:30AM Feb 28, 2021Observed: 4.96 ft at 10:45AM Feb 28, 2021Observed: 4.96 ft at 11:00AM Feb 28, 2021Observed: 4.96 ft at 11:15AM Feb 28, 2021Observed: 4.96 ft at 11:30AM Feb 28, 2021Observed: 4.97 ft at 11:45AM Feb 28, 2021Observed: 4.97 ft at 12:00PM Feb 28, 2021Observed: 4.97 ft at 12:15PM Feb 28, 2021Observed: 4.97 ft at 12:30PM Feb 28, 2021Observed: 4.97 ft at 12:45PM Feb 28, 2021Observed: 4.97 ft at 1:00PM Feb 28, 2021Observed: 4.97 ft at 1:15PM Feb 28, 2021Observed: 4.97 ft at 1:30PM Feb 28, 2021Observed: 4.97 ft at 1:45PM Feb 28, 2021Observed: 4.97 ft at 2:00PM Feb 28, 2021Observed: 4.97 ft at 2:15PM Feb 28, 2021Observed: 4.97 ft at 2:30PM Feb 28, 2021Observed: 4.97 ft at 2:45PM Feb 28, 2021Observed: 4.97 ft at 3:00PM Feb 28, 2021Observed: 4.97 ft at 3:15PM Feb 28, 2021Observed: 4.97 ft at 3:30PM Feb 28, 2021Observed: 4.97 ft at 3:45PM Feb 28, 2021Observed: 4.98 ft at 4:00PM Feb 28, 2021Observed: 4.98 ft at 4:15PM Feb 28, 2021Observed: 4.98 ft at 4:30PM Feb 28, 2021Observed: 4.98 ft at 4:45PM Feb 28, 2021Observed: 4.98 ft at 5:00PM Feb 28, 2021Observed: 4.98 ft at 5:15PM Feb 28, 2021Observed: 4.99 ft at 5:30PM Feb 28, 2021Observed: 4.99 ft at 5:45PM Feb 28, 2021Observed: 4.99 ft at 6:00PM Feb 28, 2021Observed: 4.99 ft at 6:15PM Feb 28, 2021Observed: 4.99 ft at 6:30PM Feb 28, 2021Observed: 5 ft at 6:45PM Feb 28, 2021Observed: 5 ft at 7:00PM Feb 28, 2021Observed: 5 ft at 7:15PM Feb 28, 2021Observed: 5 ft at 7:30PM Feb 28, 2021Observed: 5 ft at 7:45PM Feb 28, 2021Observed: 5 ft at 8:00PM Feb 28, 2021Observed: 5 ft at 8:15PM Feb 28, 2021Observed: 5 ft at 8:30PM Feb 28, 2021Observed: 5 ft at 8:45PM Feb 28, 2021Observed: 5 ft at 9:00PM Feb 28, 2021Observed: 5 ft at 9:15PM Feb 28, 2021Observed: 5 ft at 9:30PM Feb 28, 2021Observed: 5 ft at 9:45PM Feb 28, 2021Observed: 5 ft at 10:00PM Feb 28, 2021Observed: 5 ft at 10:15PM Feb 28, 2021Observed: 5 ft at 10:30PM Feb 28, 2021Observed: 5 ft at 10:45PM Feb 28, 2021Observed: 5 ft at 11:00PM Feb 28, 2021Observed: 5 ft at 11:15PM Feb 28, 2021Observed: 5 ft at 11:30PM Feb 28, 2021Observed: 5 ft at 11:45PM Feb 28, 2021Observed: 5 ft at 12:00AM Mar 01, 2021Observed: 5 ft at 12:15AM Mar 01, 2021Observed: 5 ft at 12:30AM Mar 01, 2021Observed: 5 ft at 12:45AM Mar 01, 2021Observed: 4.99 ft at 1:00AM Mar 01, 2021Observed: 4.99 ft at 1:15AM Mar 01, 2021Observed: 4.99 ft at 1:30AM Mar 01, 2021Observed: 4.99 ft at 1:45AM Mar 01, 2021Observed: 4.99 ft at 2:00AM Mar 01, 2021Observed: 4.99 ft at 2:15AM Mar 01, 2021Observed: 4.99 ft at 2:30AM Mar 01, 2021Observed: 4.99 ft at 2:45AM Mar 01, 2021Observed: 4.99 ft at 3:00AM Mar 01, 2021Observed: 4.99 ft at 3:15AM Mar 01, 2021Observed: 4.99 ft at 3:30AM Mar 01, 2021Observed: 4.99 ft at 3:45AM Mar 01, 2021Observed: 4.99 ft at 4:00AM Mar 01, 2021Observed: 4.99 ft at 4:15AM Mar 01, 2021Observed: 5 ft at 4:30AM Mar 01, 2021Observed: 5 ft at 4:45AM Mar 01, 2021Observed: 5 ft at 5:00AM Mar 01, 2021Observed: 5 ft at 5:15AM Mar 01, 2021Observed: 5 ft at 5:30AM Mar 01, 2021Observed: 5 ft at 5:45AM Mar 01, 2021Observed: 5 ft at 6:00AM Mar 01, 2021Observed: 5 ft at 6:15AM Mar 01, 2021Observed: 5 ft at 6:30AM Mar 01, 2021Observed: 5 ft at 6:45AM Mar 01, 2021Observed: 5 ft at 7:00AM Mar 01, 2021Observed: 5 ft at 7:15AM Mar 01, 2021Observed: 5 ft at 7:30AM Mar 01, 2021Observed: 5 ft at 7:45AM Mar 01, 2021Observed: 5 ft at 8:00AM Mar 01, 2021Observed: 5.01 ft at 8:15AM Mar 01, 2021Observed: 5 ft at 8:30AM Mar 01, 2021Observed: 5.01 ft at 8:45AM Mar 01, 2021Observed: 5.01 ft at 9:00AM Mar 01, 2021Observed: 5.01 ft at 9:15AM Mar 01, 2021Observed: 5.01 ft at 9:30AM Mar 01, 2021Observed: 5.01 ft at 9:45AM Mar 01, 2021Observed: 5.01 ft at 10:00AM Mar 01, 2021Observed: 5.01 ft at 10:15AM Mar 01, 2021Observed: 5.01 ft at 10:30AM Mar 01, 2021Observed: 5.01 ft at 10:45AM Mar 01, 2021Observed: 5.01 ft at 11:00AM Mar 01, 2021Observed: 5.01 ft at 11:15AM Mar 01, 2021Observed: 5.01 ft at 11:30AM Mar 01, 2021Observed: 5.01 ft at 11:45AM Mar 01, 2021Observed: 5.01 ft at 12:00PM Mar 01, 2021Observed: 5.01 ft at 12:15PM Mar 01, 2021Observed: 5.01 ft at 12:30PM Mar 01, 2021Highest Observation: 5.02 ft at 12:45PM Mar 01, 2021Highest Observation: 5.02 ft at 1:00PM Mar 01, 2021Highest Observation: 5.02 ft at 1:15PM Mar 01, 2021Highest Observation: 5.02 ft at 1:30PM Mar 01, 2021Observed: 5.01 ft at 1:45PM Mar 01, 2021Observed: 5.01 ft at 2:00PM Mar 01, 2021Observed: 5.01 ft at 2:15PM Mar 01, 2021Observed: 5.01 ft at 2:30PM Mar 01, 2021Highest Forecast: 4.9 ft 7:00PM Mar 01, 2021Highest Forecast: 4.9 ft 1:00AM Mar 02, 2021Highest Forecast: 4.9 ft 7:00AM Mar 02, 2021Highest Forecast: 4.9 ft 1:00PM Mar 02, 2021Highest Forecast: 4.9 ft 7:00PM Mar 02, 2021Highest Forecast: 4.9 ft 1:00AM Mar 03, 2021Highest Forecast: 4.9 ft 7:00AM Mar 03, 2021Highest Forecast: 4.9 ft 1:00PM Mar 03, 2021Highest Forecast: 4.9 ft 7:00PM Mar 03, 2021Highest Forecast: 4.9 ft 1:00AM Mar 04, 2021Highest Forecast: 4.9 ft 7:00AM Mar 04, 2021USGS--Water Resources of the United StatesGRNM1(plotting HGIRG) Graph Created (3:02PM Mar 1, 2021)ObservedForecast (issued 11:54AM Mar 1)Latest observed value: 5.01 ft at 2:30 PM EST 1-Mar-2021. Flood Stage is 13 ft
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (EST)
XML Data
RSS Files
Datum: Not Available
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: 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
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 12.50 ft on 04/28/2019
(2) 12.09 ft on 04/27/2018
(3) 15.02 ft on 04/30/2008
(4) 14.71 ft on 04/29/1973
(5) 14.00 ft on 03/20/1936
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
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
16 Widespread flooding of State Route 11 from Grindstone to Medway. Numerous homes, camps and campgrounds inundated. Flooding akin to April 1923.
15 State Route 11 flooded and impassable. Homes/camps inundated.
13 State Route 11 flooded in places. Homes and camps threatened.
12 State Route 11 gets water across the road, but passable.
11 River rising with minor lowland flooding.
About This Location Collapse

Latitude: 45.730278° N, Longitude: 68.589444° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 13 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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