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Hydrograph River at a Glance Download
Penobscot River above Grindstone Stage (ft)Flow (kcfs)Observed: 5.52 ft at 10:30PM Mar 18, 2023Observed: 5.52 ft at 10:45PM Mar 18, 2023Observed: 5.52 ft at 11:00PM Mar 18, 2023Observed: 5.53 ft at 11:15PM Mar 18, 2023Observed: 5.53 ft at 11:30PM Mar 18, 2023Observed: 5.53 ft at 11:45PM Mar 18, 2023Observed: 5.53 ft at 12:00AM Mar 19, 2023Observed: 5.54 ft at 12:15AM Mar 19, 2023Observed: 5.54 ft at 12:30AM Mar 19, 2023Observed: 5.54 ft at 12:45AM Mar 19, 2023Observed: 5.54 ft at 1:00AM Mar 19, 2023Observed: 5.55 ft at 1:15AM Mar 19, 2023Observed: 5.55 ft at 1:30AM Mar 19, 2023Observed: 5.55 ft at 1:45AM Mar 19, 2023Observed: 5.55 ft at 2:00AM Mar 19, 2023Observed: 5.55 ft at 2:15AM Mar 19, 2023Observed: 5.56 ft at 2:30AM Mar 19, 2023Observed: 5.56 ft at 2:45AM Mar 19, 2023Observed: 5.56 ft at 3:00AM Mar 19, 2023Observed: 5.57 ft at 3:15AM Mar 19, 2023Observed: 5.57 ft at 3:30AM Mar 19, 2023Observed: 5.57 ft at 3:45AM Mar 19, 2023Observed: 5.57 ft at 4:00AM Mar 19, 2023Observed: 5.58 ft at 4:15AM Mar 19, 2023Observed: 5.58 ft at 4:30AM Mar 19, 2023Observed: 5.58 ft at 4:45AM Mar 19, 2023Observed: 5.58 ft at 5:00AM Mar 19, 2023Observed: 5.59 ft at 5:15AM Mar 19, 2023Observed: 5.59 ft at 5:30AM Mar 19, 2023Observed: 5.59 ft at 5:45AM Mar 19, 2023Observed: 5.59 ft at 6:00AM Mar 19, 2023Observed: 5.59 ft at 6:15AM Mar 19, 2023Observed: 5.6 ft at 6:30AM Mar 19, 2023Observed: 5.6 ft at 6:45AM Mar 19, 2023Observed: 5.6 ft at 7:00AM Mar 19, 2023Observed: 5.6 ft at 7:15AM Mar 19, 2023Observed: 5.6 ft at 7:30AM Mar 19, 2023Observed: 5.6 ft at 7:45AM Mar 19, 2023Observed: 5.6 ft at 8:00AM Mar 19, 2023Observed: 5.6 ft at 8:15AM Mar 19, 2023Observed: 5.61 ft at 8:30AM Mar 19, 2023Observed: 5.61 ft at 8:45AM Mar 19, 2023Observed: 5.61 ft at 9:00AM Mar 19, 2023Observed: 5.61 ft at 9:15AM Mar 19, 2023Observed: 5.61 ft at 9:30AM Mar 19, 2023Observed: 5.61 ft at 9:45AM Mar 19, 2023Observed: 5.61 ft at 10:00AM Mar 19, 2023Observed: 5.61 ft at 10:15AM Mar 19, 2023Observed: 5.61 ft at 10:30AM Mar 19, 2023Observed: 5.61 ft at 10:45AM Mar 19, 2023Observed: 5.61 ft at 11:00AM Mar 19, 2023Observed: 5.61 ft at 11:15AM Mar 19, 2023Observed: 5.61 ft at 11:30AM Mar 19, 2023Observed: 5.61 ft at 11:45AM Mar 19, 2023Observed: 5.61 ft at 12:00PM Mar 19, 2023Observed: 5.61 ft at 12:15PM Mar 19, 2023Observed: 5.61 ft at 12:30PM Mar 19, 2023Observed: 5.61 ft at 12:45PM Mar 19, 2023Observed: 5.61 ft at 1:00PM Mar 19, 2023Observed: 5.61 ft at 1:15PM Mar 19, 2023Observed: 5.61 ft at 1:30PM Mar 19, 2023Observed: 5.61 ft at 1:45PM Mar 19, 2023Observed: 5.61 ft at 2:00PM Mar 19, 2023Observed: 5.61 ft at 2:15PM Mar 19, 2023Observed: 5.62 ft at 2:30PM Mar 19, 2023Observed: 5.61 ft at 2:45PM Mar 19, 2023Observed: 5.61 ft at 3:00PM Mar 19, 2023Observed: 5.62 ft at 3:15PM Mar 19, 2023Observed: 5.61 ft at 3:30PM Mar 19, 2023Observed: 5.61 ft at 3:45PM Mar 19, 2023Observed: 5.62 ft at 4:00PM Mar 19, 2023Observed: 5.61 ft at 4:15PM Mar 19, 2023Observed: 5.61 ft at 4:30PM Mar 19, 2023Observed: 5.62 ft at 4:45PM Mar 19, 2023Observed: 5.62 ft at 5:00PM Mar 19, 2023Observed: 5.62 ft at 5:15PM Mar 19, 2023Observed: 5.62 ft at 5:30PM Mar 19, 2023Observed: 5.62 ft at 5:45PM Mar 19, 2023Observed: 5.62 ft at 6:00PM Mar 19, 2023Observed: 5.62 ft at 6:15PM Mar 19, 2023Observed: 5.62 ft at 6:30PM Mar 19, 2023Observed: 5.62 ft at 6:45PM Mar 19, 2023Observed: 5.62 ft at 7:00PM Mar 19, 2023Observed: 5.62 ft at 7:15PM Mar 19, 2023Observed: 5.62 ft at 7:30PM Mar 19, 2023Observed: 5.62 ft at 7:45PM Mar 19, 2023Observed: 5.62 ft at 8:00PM Mar 19, 2023Observed: 5.63 ft at 8:15PM Mar 19, 2023Observed: 5.62 ft at 8:30PM Mar 19, 2023Observed: 5.63 ft at 8:45PM Mar 19, 2023Observed: 5.63 ft at 9:00PM Mar 19, 2023Observed: 5.62 ft at 9:15PM Mar 19, 2023Observed: 5.62 ft at 9:30PM Mar 19, 2023Observed: 5.62 ft at 9:45PM Mar 19, 2023Observed: 5.62 ft at 10:00PM Mar 19, 2023Observed: 5.62 ft at 10:15PM Mar 19, 2023Observed: 5.62 ft at 10:30PM Mar 19, 2023Observed: 5.62 ft at 10:45PM Mar 19, 2023Observed: 5.62 ft at 11:00PM Mar 19, 2023Observed: 5.62 ft at 11:15PM Mar 19, 2023Observed: 5.62 ft at 11:30PM Mar 19, 2023Observed: 5.61 ft at 11:45PM Mar 19, 2023Observed: 5.61 ft at 12:00AM Mar 20, 2023Observed: 5.61 ft at 12:15AM Mar 20, 2023Observed: 5.61 ft at 12:30AM Mar 20, 2023Observed: 5.61 ft at 12:45AM Mar 20, 2023Observed: 5.61 ft at 1:00AM Mar 20, 2023Observed: 5.61 ft at 1:15AM Mar 20, 2023Observed: 5.61 ft at 1:30AM Mar 20, 2023Observed: 5.61 ft at 1:45AM Mar 20, 2023Observed: 5.61 ft at 2:00AM Mar 20, 2023Observed: 5.61 ft at 2:15AM Mar 20, 2023Observed: 5.61 ft at 2:30AM Mar 20, 2023Observed: 5.61 ft at 2:45AM Mar 20, 2023Observed: 5.61 ft at 3:00AM Mar 20, 2023Observed: 5.61 ft at 3:15AM Mar 20, 2023Observed: 5.61 ft at 3:30AM Mar 20, 2023Observed: 5.61 ft at 3:45AM Mar 20, 2023Observed: 5.61 ft at 4:00AM Mar 20, 2023Observed: 5.61 ft at 4:15AM Mar 20, 2023Observed: 5.61 ft at 4:30AM Mar 20, 2023Observed: 5.61 ft at 4:45AM Mar 20, 2023Observed: 5.61 ft at 5:00AM Mar 20, 2023Observed: 5.61 ft at 5:15AM Mar 20, 2023Observed: 5.61 ft at 5:30AM Mar 20, 2023Observed: 5.6 ft at 5:45AM Mar 20, 2023Observed: 5.6 ft at 6:00AM Mar 20, 2023Observed: 5.6 ft at 6:15AM Mar 20, 2023Observed: 5.59 ft at 6:30AM Mar 20, 2023Observed: 5.59 ft at 6:45AM Mar 20, 2023Observed: 5.59 ft at 7:00AM Mar 20, 2023Observed: 5.58 ft at 7:15AM Mar 20, 2023Observed: 5.58 ft at 7:30AM Mar 20, 2023Observed: 5.58 ft at 7:45AM Mar 20, 2023Observed: 5.57 ft at 8:00AM Mar 20, 2023Observed: 5.56 ft at 8:15AM Mar 20, 2023Observed: 5.56 ft at 8:30AM Mar 20, 2023Observed: 5.55 ft at 8:45AM Mar 20, 2023Observed: 5.55 ft at 9:00AM Mar 20, 2023Observed: 5.54 ft at 9:15AM Mar 20, 2023Observed: 5.53 ft at 9:30AM Mar 20, 2023Observed: 5.53 ft at 9:45AM Mar 20, 2023Observed: 5.52 ft at 10:00AM Mar 20, 2023Observed: 5.51 ft at 10:15AM Mar 20, 2023Observed: 5.51 ft at 10:30AM Mar 20, 2023Observed: 5.5 ft at 10:45AM Mar 20, 2023Observed: 5.49 ft at 11:00AM Mar 20, 2023Observed: 5.49 ft at 11:15AM Mar 20, 2023Observed: 5.48 ft at 11:30AM Mar 20, 2023Observed: 5.47 ft at 11:45AM Mar 20, 2023Observed: 5.47 ft at 12:00PM Mar 20, 2023Observed: 5.46 ft at 12:15PM Mar 20, 2023Observed: 5.46 ft at 12:30PM Mar 20, 2023Observed: 5.45 ft at 12:45PM Mar 20, 2023Observed: 5.45 ft at 1:00PM Mar 20, 2023Observed: 5.44 ft at 1:15PM Mar 20, 2023Observed: 5.44 ft at 1:30PM Mar 20, 2023Observed: 5.43 ft at 1:45PM Mar 20, 2023Observed: 5.43 ft at 2:00PM Mar 20, 2023Observed: 5.42 ft at 2:15PM Mar 20, 2023Observed: 5.42 ft at 2:30PM Mar 20, 2023Observed: 5.41 ft at 2:45PM Mar 20, 2023Observed: 5.41 ft at 3:00PM Mar 20, 2023Observed: 5.4 ft at 3:15PM Mar 20, 2023Observed: 5.4 ft at 3:30PM Mar 20, 2023Observed: 5.4 ft at 3:45PM Mar 20, 2023Observed: 5.4 ft at 4:00PM Mar 20, 2023Observed: 5.4 ft at 4:15PM Mar 20, 2023Observed: 5.4 ft at 4:30PM Mar 20, 2023Observed: 5.4 ft at 4:45PM Mar 20, 2023Observed: 5.4 ft at 5:00PM Mar 20, 2023Observed: 5.39 ft at 5:15PM Mar 20, 2023Observed: 5.4 ft at 5:30PM Mar 20, 2023Observed: 5.4 ft at 5:45PM Mar 20, 2023Observed: 5.4 ft at 6:00PM Mar 20, 2023Observed: 5.4 ft at 6:15PM Mar 20, 2023Observed: 5.4 ft at 6:30PM Mar 20, 2023Observed: 5.41 ft at 6:45PM Mar 20, 2023Observed: 5.41 ft at 7:00PM Mar 20, 2023Observed: 5.41 ft at 7:15PM Mar 20, 2023Observed: 5.41 ft at 7:30PM Mar 20, 2023Observed: 5.41 ft at 7:45PM Mar 20, 2023Observed: 5.41 ft at 8:00PM Mar 20, 2023Observed: 5.41 ft at 8:15PM Mar 20, 2023Observed: 5.41 ft at 8:30PM Mar 20, 2023Observed: 5.41 ft at 8:45PM Mar 20, 2023Observed: 5.41 ft at 9:00PM Mar 20, 2023Observed: 5.41 ft at 9:15PM Mar 20, 2023Observed: 5.41 ft at 9:30PM Mar 20, 2023Observed: 5.41 ft at 9:45PM Mar 20, 2023Observed: 5.41 ft at 10:00PM Mar 20, 2023Observed: 5.41 ft at 10:15PM Mar 20, 2023Observed: 5.41 ft at 10:30PM Mar 20, 2023Observed: 5.42 ft at 10:45PM Mar 20, 2023Observed: 5.42 ft at 11:00PM Mar 20, 2023Observed: 5.42 ft at 11:15PM Mar 20, 2023Observed: 5.42 ft at 11:30PM Mar 20, 2023Observed: 5.43 ft at 11:45PM Mar 20, 2023Observed: 5.43 ft at 12:00AM Mar 21, 2023Observed: 5.44 ft at 12:15AM Mar 21, 2023Observed: 5.44 ft at 12:30AM Mar 21, 2023Observed: 5.45 ft at 12:45AM Mar 21, 2023Observed: 5.46 ft at 1:00AM Mar 21, 2023Observed: 5.47 ft at 1:15AM Mar 21, 2023Observed: 5.48 ft at 1:30AM Mar 21, 2023Observed: 5.48 ft at 1:45AM Mar 21, 2023Observed: 5.49 ft at 2:00AM Mar 21, 2023Observed: 5.5 ft at 2:15AM Mar 21, 2023Observed: 5.51 ft at 2:30AM Mar 21, 2023Observed: 5.52 ft at 2:45AM Mar 21, 2023Observed: 5.53 ft at 3:00AM Mar 21, 2023Observed: 5.54 ft at 3:15AM Mar 21, 2023Observed: 5.55 ft at 3:30AM Mar 21, 2023Observed: 5.56 ft at 3:45AM Mar 21, 2023Observed: 5.57 ft at 4:00AM Mar 21, 2023Observed: 5.57 ft at 4:15AM Mar 21, 2023Observed: 5.58 ft at 4:30AM Mar 21, 2023Observed: 5.59 ft at 4:45AM Mar 21, 2023Observed: 5.6 ft at 5:00AM Mar 21, 2023Observed: 5.61 ft at 5:15AM Mar 21, 2023Observed: 5.61 ft at 5:30AM Mar 21, 2023Observed: 5.62 ft at 5:45AM Mar 21, 2023Observed: 5.63 ft at 6:00AM Mar 21, 2023Observed: 5.63 ft at 6:15AM Mar 21, 2023Observed: 5.64 ft at 6:30AM Mar 21, 2023Observed: 5.64 ft at 6:45AM Mar 21, 2023Observed: 5.64 ft at 7:00AM Mar 21, 2023Highest Observation: 5.65 ft at 7:15AM Mar 21, 2023Highest Observation: 5.65 ft at 7:30AM Mar 21, 2023Highest Observation: 5.65 ft at 7:45AM Mar 21, 2023Highest Observation: 5.65 ft at 8:00AM Mar 21, 2023Highest Observation: 5.65 ft at 8:15AM Mar 21, 2023Highest Observation: 5.65 ft at 8:30AM Mar 21, 2023Highest Observation: 5.65 ft at 8:45AM Mar 21, 2023Highest Observation: 5.65 ft at 9:00AM Mar 21, 2023Highest Observation: 5.65 ft at 9:15AM Mar 21, 2023Highest Observation: 5.65 ft at 9:30AM Mar 21, 2023Observed: 5.64 ft at 9:45AM Mar 21, 2023Observed: 5.64 ft at 10:00AM Mar 21, 2023Observed: 5.64 ft at 10:15AM Mar 21, 2023Observed: 5.63 ft at 10:30AM Mar 21, 2023Observed: 5.63 ft at 10:45AM Mar 21, 2023Observed: 5.63 ft at 11:00AM Mar 21, 2023Observed: 5.62 ft at 11:15AM Mar 21, 2023Observed: 5.61 ft at 11:30AM Mar 21, 2023Observed: 5.61 ft at 11:45AM Mar 21, 2023Observed: 5.6 ft at 12:00PM Mar 21, 2023Observed: 5.6 ft at 12:15PM Mar 21, 2023Observed: 5.59 ft at 12:30PM Mar 21, 2023Observed: 5.58 ft at 12:45PM Mar 21, 2023Observed: 5.58 ft at 1:00PM Mar 21, 2023Observed: 5.57 ft at 1:15PM Mar 21, 2023Observed: 5.56 ft at 1:30PM Mar 21, 2023Observed: 5.56 ft at 1:45PM Mar 21, 2023Observed: 5.55 ft at 2:00PM Mar 21, 2023Observed: 5.55 ft at 2:15PM Mar 21, 2023Observed: 5.54 ft at 2:30PM Mar 21, 2023Observed: 5.54 ft at 2:45PM Mar 21, 2023Observed: 5.53 ft at 3:00PM Mar 21, 2023Observed: 5.53 ft at 3:15PM Mar 21, 2023Observed: 5.53 ft at 3:30PM Mar 21, 2023Observed: 5.52 ft at 3:45PM Mar 21, 2023Observed: 5.52 ft at 4:00PM Mar 21, 2023Observed: 5.52 ft at 4:15PM Mar 21, 2023Observed: 5.52 ft at 4:30PM Mar 21, 2023Observed: 5.51 ft at 4:45PM Mar 21, 2023Observed: 5.51 ft at 5:00PM Mar 21, 2023Observed: 5.51 ft at 5:15PM Mar 21, 2023Observed: 5.51 ft at 5:30PM Mar 21, 2023Observed: 5.51 ft at 5:45PM Mar 21, 2023Observed: 5.51 ft at 6:00PM Mar 21, 2023Observed: 5.51 ft at 6:15PM Mar 21, 2023Observed: 5.5 ft at 6:30PM Mar 21, 2023Observed: 5.5 ft at 6:45PM Mar 21, 2023Observed: 5.51 ft at 7:00PM Mar 21, 2023Observed: 5.5 ft at 7:15PM Mar 21, 2023Observed: 5.5 ft at 7:30PM Mar 21, 2023Observed: 5.5 ft at 7:45PM Mar 21, 2023Observed: 5.5 ft at 8:00PM Mar 21, 2023Observed: 5.51 ft at 8:15PM Mar 21, 2023Observed: 5.51 ft at 8:30PM Mar 21, 2023Observed: 5.51 ft at 8:45PM Mar 21, 2023Observed: 5.51 ft at 9:00PM Mar 21, 2023Forecast: 5.4 ft 2:00AM Mar 22, 2023Forecast: 5.4 ft 8:00AM Mar 22, 2023Forecast: 5.4 ft 2:00PM Mar 22, 2023Forecast: 5.4 ft 8:00PM Mar 22, 2023Forecast: 5.4 ft 2:00AM Mar 23, 2023Forecast: 5.4 ft 8:00AM Mar 23, 2023Forecast: 5.4 ft 2:00PM Mar 23, 2023Forecast: 5.4 ft 8:00PM Mar 23, 2023Forecast: 5.5 ft 2:00AM Mar 24, 2023Highest Forecast: 5.6 ft 8:00AM Mar 24, 2023USGS--Water Resources of the United StatesGRNM1(plotting HGIRG) Graph Created (10:16PM Mar 21, 2023)ObservedForecast (issued 11:19AM Mar 21)Latest observed value: 5.51 ft at 9:00 PM EDT 21-Mar-2023. Flood Stage is 13 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: 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
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 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.
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 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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