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Hydrograph River at a Glance Download
Penobscot River above Grindstone Stage (ft)Flow (kcfs)Observed: 6.63 ft at 2:45PM Sep 25, 2023Observed: 6.63 ft at 3:00PM Sep 25, 2023Observed: 6.63 ft at 3:15PM Sep 25, 2023Observed: 6.63 ft at 3:30PM Sep 25, 2023Highest Observation: 6.64 ft at 3:45PM Sep 25, 2023Observed: 6.63 ft at 4:00PM Sep 25, 2023Highest Observation: 6.64 ft at 4:15PM Sep 25, 2023Observed: 6.63 ft at 4:30PM Sep 25, 2023Observed: 6.63 ft at 4:45PM Sep 25, 2023Observed: 6.63 ft at 5:00PM Sep 25, 2023Observed: 6.63 ft at 5:15PM Sep 25, 2023Observed: 6.63 ft at 5:30PM Sep 25, 2023Observed: 6.63 ft at 5:45PM Sep 25, 2023Observed: 6.63 ft at 6:00PM Sep 25, 2023Observed: 6.63 ft at 6:15PM Sep 25, 2023Observed: 6.63 ft at 6:30PM Sep 25, 2023Observed: 6.63 ft at 6:45PM Sep 25, 2023Observed: 6.63 ft at 7:00PM Sep 25, 2023Observed: 6.63 ft at 7:15PM Sep 25, 2023Observed: 6.63 ft at 7:30PM Sep 25, 2023Observed: 6.63 ft at 7:45PM Sep 25, 2023Observed: 6.63 ft at 8:00PM Sep 25, 2023Observed: 6.63 ft at 8:15PM Sep 25, 2023Observed: 6.63 ft at 8:30PM Sep 25, 2023Observed: 6.63 ft at 8:45PM Sep 25, 2023Observed: 6.63 ft at 9:00PM Sep 25, 2023Observed: 6.63 ft at 9:15PM Sep 25, 2023Observed: 6.62 ft at 9:30PM Sep 25, 2023Observed: 6.62 ft at 9:45PM Sep 25, 2023Observed: 6.62 ft at 10:00PM Sep 25, 2023Observed: 6.62 ft at 10:15PM Sep 25, 2023Observed: 6.62 ft at 10:30PM Sep 25, 2023Observed: 6.62 ft at 10:45PM Sep 25, 2023Observed: 6.62 ft at 11:00PM Sep 25, 2023Observed: 6.62 ft at 11:15PM Sep 25, 2023Observed: 6.62 ft at 11:30PM Sep 25, 2023Observed: 6.62 ft at 11:45PM Sep 25, 2023Observed: 6.61 ft at 12:00AM Sep 26, 2023Observed: 6.61 ft at 12:15AM Sep 26, 2023Observed: 6.61 ft at 12:30AM Sep 26, 2023Observed: 6.61 ft at 12:45AM Sep 26, 2023Observed: 6.61 ft at 1:00AM Sep 26, 2023Observed: 6.61 ft at 1:15AM Sep 26, 2023Observed: 6.61 ft at 1:30AM Sep 26, 2023Observed: 6.61 ft at 1:45AM Sep 26, 2023Observed: 6.61 ft at 2:00AM Sep 26, 2023Observed: 6.61 ft at 2:15AM Sep 26, 2023Observed: 6.61 ft at 2:30AM Sep 26, 2023Observed: 6.6 ft at 2:45AM Sep 26, 2023Observed: 6.6 ft at 3:00AM Sep 26, 2023Observed: 6.6 ft at 3:15AM Sep 26, 2023Observed: 6.6 ft at 3:30AM Sep 26, 2023Observed: 6.6 ft at 3:45AM Sep 26, 2023Observed: 6.6 ft at 4:00AM Sep 26, 2023Observed: 6.6 ft at 4:15AM Sep 26, 2023Observed: 6.6 ft at 4:30AM Sep 26, 2023Observed: 6.6 ft at 4:45AM Sep 26, 2023Observed: 6.6 ft at 5:00AM Sep 26, 2023Observed: 6.59 ft at 5:15AM Sep 26, 2023Observed: 6.59 ft at 5:30AM Sep 26, 2023Observed: 6.59 ft at 5:45AM Sep 26, 2023Observed: 6.59 ft at 6:00AM Sep 26, 2023Observed: 6.59 ft at 6:15AM Sep 26, 2023Observed: 6.59 ft at 6:30AM Sep 26, 2023Observed: 6.59 ft at 6:45AM Sep 26, 2023Observed: 6.59 ft at 7:00AM Sep 26, 2023Observed: 6.59 ft at 7:15AM Sep 26, 2023Observed: 6.58 ft at 7:30AM Sep 26, 2023Observed: 6.58 ft at 7:45AM Sep 26, 2023Observed: 6.58 ft at 8:00AM Sep 26, 2023Observed: 6.58 ft at 8:15AM Sep 26, 2023Observed: 6.58 ft at 8:30AM Sep 26, 2023Observed: 6.58 ft at 8:45AM Sep 26, 2023Observed: 6.58 ft at 9:00AM Sep 26, 2023Observed: 6.58 ft at 9:15AM Sep 26, 2023Observed: 6.58 ft at 9:30AM Sep 26, 2023Observed: 6.58 ft at 9:45AM Sep 26, 2023Observed: 6.58 ft at 10:00AM Sep 26, 2023Observed: 6.58 ft at 10:15AM Sep 26, 2023Observed: 6.58 ft at 10:30AM Sep 26, 2023Observed: 6.57 ft at 10:45AM Sep 26, 2023Observed: 6.57 ft at 11:00AM Sep 26, 2023Observed: 6.57 ft at 11:15AM Sep 26, 2023Observed: 6.57 ft at 11:30AM Sep 26, 2023Observed: 6.57 ft at 11:45AM Sep 26, 2023Observed: 6.57 ft at 12:00PM Sep 26, 2023Observed: 6.57 ft at 12:15PM Sep 26, 2023Observed: 6.56 ft at 12:30PM Sep 26, 2023Observed: 6.56 ft at 12:45PM Sep 26, 2023Observed: 6.56 ft at 1:00PM Sep 26, 2023Observed: 6.56 ft at 1:15PM Sep 26, 2023Observed: 6.56 ft at 1:30PM Sep 26, 2023Observed: 6.56 ft at 1:45PM Sep 26, 2023Observed: 6.56 ft at 2:00PM Sep 26, 2023Observed: 6.56 ft at 2:15PM Sep 26, 2023Observed: 6.56 ft at 2:30PM Sep 26, 2023Observed: 6.56 ft at 2:45PM Sep 26, 2023Observed: 6.55 ft at 3:00PM Sep 26, 2023Observed: 6.55 ft at 3:15PM Sep 26, 2023Observed: 6.55 ft at 3:30PM Sep 26, 2023Observed: 6.55 ft at 3:45PM Sep 26, 2023Observed: 6.55 ft at 4:00PM Sep 26, 2023Observed: 6.55 ft at 4:15PM Sep 26, 2023Observed: 6.55 ft at 4:30PM Sep 26, 2023Observed: 6.55 ft at 4:45PM Sep 26, 2023Observed: 6.54 ft at 5:00PM Sep 26, 2023Observed: 6.54 ft at 5:15PM Sep 26, 2023Observed: 6.54 ft at 5:30PM Sep 26, 2023Observed: 6.54 ft at 5:45PM Sep 26, 2023Observed: 6.54 ft at 6:00PM Sep 26, 2023Observed: 6.54 ft at 6:15PM Sep 26, 2023Observed: 6.54 ft at 6:30PM Sep 26, 2023Observed: 6.54 ft at 6:45PM Sep 26, 2023Observed: 6.54 ft at 7:00PM Sep 26, 2023Observed: 6.54 ft at 7:15PM Sep 26, 2023Observed: 6.54 ft at 7:30PM Sep 26, 2023Observed: 6.54 ft at 7:45PM Sep 26, 2023Observed: 6.53 ft at 8:00PM Sep 26, 2023Observed: 6.53 ft at 8:15PM Sep 26, 2023Observed: 6.53 ft at 8:30PM Sep 26, 2023Observed: 6.53 ft at 8:45PM Sep 26, 2023Observed: 6.53 ft at 9:00PM Sep 26, 2023Observed: 6.53 ft at 9:15PM Sep 26, 2023Observed: 6.53 ft at 9:30PM Sep 26, 2023Observed: 6.53 ft at 9:45PM Sep 26, 2023Observed: 6.53 ft at 10:00PM Sep 26, 2023Observed: 6.53 ft at 10:15PM Sep 26, 2023Observed: 6.53 ft at 10:30PM Sep 26, 2023Observed: 6.53 ft at 10:45PM Sep 26, 2023Observed: 6.53 ft at 11:00PM Sep 26, 2023Observed: 6.53 ft at 11:15PM Sep 26, 2023Observed: 6.52 ft at 11:30PM Sep 26, 2023Observed: 6.52 ft at 11:45PM Sep 26, 2023Observed: 6.52 ft at 12:00AM Sep 27, 2023Observed: 6.52 ft at 12:15AM Sep 27, 2023Observed: 6.52 ft at 12:30AM Sep 27, 2023Observed: 6.52 ft at 12:45AM Sep 27, 2023Observed: 6.52 ft at 1:00AM Sep 27, 2023Observed: 6.52 ft at 1:15AM Sep 27, 2023Observed: 6.52 ft at 1:30AM Sep 27, 2023Observed: 6.52 ft at 1:45AM Sep 27, 2023Observed: 6.52 ft at 2:00AM Sep 27, 2023Observed: 6.51 ft at 2:15AM Sep 27, 2023Observed: 6.51 ft at 2:30AM Sep 27, 2023Observed: 6.51 ft at 2:45AM Sep 27, 2023Observed: 6.51 ft at 3:00AM Sep 27, 2023Observed: 6.51 ft at 3:15AM Sep 27, 2023Observed: 6.51 ft at 3:30AM Sep 27, 2023Observed: 6.51 ft at 3:45AM Sep 27, 2023Observed: 6.51 ft at 4:00AM Sep 27, 2023Observed: 6.51 ft at 4:15AM Sep 27, 2023Observed: 6.5 ft at 4:30AM Sep 27, 2023Observed: 6.5 ft at 4:45AM Sep 27, 2023Observed: 6.5 ft at 5:00AM Sep 27, 2023Observed: 6.5 ft at 5:15AM Sep 27, 2023Observed: 6.5 ft at 5:30AM Sep 27, 2023Observed: 6.5 ft at 5:45AM Sep 27, 2023Observed: 6.5 ft at 6:00AM Sep 27, 2023Observed: 6.5 ft at 6:15AM Sep 27, 2023Observed: 6.5 ft at 6:30AM Sep 27, 2023Observed: 6.5 ft at 6:45AM Sep 27, 2023Observed: 6.49 ft at 7:00AM Sep 27, 2023Observed: 6.49 ft at 7:15AM Sep 27, 2023Observed: 6.49 ft at 7:30AM Sep 27, 2023Observed: 6.49 ft at 7:45AM Sep 27, 2023Observed: 6.49 ft at 8:00AM Sep 27, 2023Observed: 6.49 ft at 8:15AM Sep 27, 2023Observed: 6.49 ft at 8:30AM Sep 27, 2023Observed: 6.49 ft at 8:45AM Sep 27, 2023Observed: 6.49 ft at 9:00AM Sep 27, 2023Observed: 6.49 ft at 9:15AM Sep 27, 2023Observed: 6.49 ft at 9:30AM Sep 27, 2023Observed: 6.49 ft at 9:45AM Sep 27, 2023Observed: 6.48 ft at 10:00AM Sep 27, 2023Observed: 6.49 ft at 10:15AM Sep 27, 2023Observed: 6.49 ft at 10:30AM Sep 27, 2023Observed: 6.48 ft at 10:45AM Sep 27, 2023Observed: 6.48 ft at 11:00AM Sep 27, 2023Observed: 6.48 ft at 11:15AM Sep 27, 2023Observed: 6.48 ft at 11:30AM Sep 27, 2023Observed: 6.48 ft at 11:45AM Sep 27, 2023Observed: 6.48 ft at 12:00PM Sep 27, 2023Observed: 6.48 ft at 12:15PM Sep 27, 2023Observed: 6.48 ft at 12:30PM Sep 27, 2023Observed: 6.47 ft at 12:45PM Sep 27, 2023Observed: 6.47 ft at 1:00PM Sep 27, 2023Observed: 6.47 ft at 1:15PM Sep 27, 2023Observed: 6.47 ft at 1:30PM Sep 27, 2023Observed: 6.47 ft at 1:45PM Sep 27, 2023Observed: 6.47 ft at 2:00PM Sep 27, 2023Observed: 6.47 ft at 2:15PM Sep 27, 2023Observed: 6.47 ft at 2:30PM Sep 27, 2023Observed: 6.47 ft at 2:45PM Sep 27, 2023Observed: 6.47 ft at 3:00PM Sep 27, 2023Observed: 6.47 ft at 3:15PM Sep 27, 2023Observed: 6.46 ft at 3:30PM Sep 27, 2023Observed: 6.46 ft at 3:45PM Sep 27, 2023Observed: 6.46 ft at 4:00PM Sep 27, 2023Observed: 6.46 ft at 4:15PM Sep 27, 2023Observed: 6.46 ft at 4:30PM Sep 27, 2023Observed: 6.46 ft at 4:45PM Sep 27, 2023Observed: 6.46 ft at 5:00PM Sep 27, 2023Observed: 6.46 ft at 5:15PM Sep 27, 2023Observed: 6.46 ft at 5:30PM Sep 27, 2023Observed: 6.46 ft at 5:45PM Sep 27, 2023Observed: 6.46 ft at 6:00PM Sep 27, 2023Observed: 6.46 ft at 6:15PM Sep 27, 2023Observed: 6.47 ft at 6:30PM Sep 27, 2023Observed: 6.47 ft at 6:45PM Sep 27, 2023Observed: 6.47 ft at 7:00PM Sep 27, 2023Observed: 6.47 ft at 7:15PM Sep 27, 2023Observed: 6.48 ft at 7:30PM Sep 27, 2023Observed: 6.48 ft at 7:45PM Sep 27, 2023Observed: 6.48 ft at 8:00PM Sep 27, 2023Observed: 6.48 ft at 8:15PM Sep 27, 2023Observed: 6.48 ft at 8:30PM Sep 27, 2023Observed: 6.48 ft at 8:45PM Sep 27, 2023Observed: 6.48 ft at 9:00PM Sep 27, 2023Observed: 6.48 ft at 9:15PM Sep 27, 2023Observed: 6.48 ft at 9:30PM Sep 27, 2023Observed: 6.48 ft at 9:45PM Sep 27, 2023Observed: 6.48 ft at 10:00PM Sep 27, 2023Observed: 6.47 ft at 10:15PM Sep 27, 2023Observed: 6.47 ft at 10:30PM Sep 27, 2023Observed: 6.47 ft at 10:45PM Sep 27, 2023Observed: 6.47 ft at 11:00PM Sep 27, 2023Observed: 6.47 ft at 11:15PM Sep 27, 2023Observed: 6.47 ft at 11:30PM Sep 27, 2023Observed: 6.46 ft at 11:45PM Sep 27, 2023Observed: 6.46 ft at 12:00AM Sep 28, 2023Observed: 6.46 ft at 12:15AM Sep 28, 2023Observed: 6.46 ft at 12:30AM Sep 28, 2023Observed: 6.46 ft at 12:45AM Sep 28, 2023Observed: 6.45 ft at 1:00AM Sep 28, 2023Observed: 6.45 ft at 1:15AM Sep 28, 2023Observed: 6.45 ft at 1:30AM Sep 28, 2023Observed: 6.45 ft at 1:45AM Sep 28, 2023Observed: 6.45 ft at 2:00AM Sep 28, 2023Observed: 6.44 ft at 2:15AM Sep 28, 2023Observed: 6.44 ft at 2:30AM Sep 28, 2023Observed: 6.44 ft at 2:45AM Sep 28, 2023Observed: 6.44 ft at 3:00AM Sep 28, 2023Observed: 6.44 ft at 3:15AM Sep 28, 2023Observed: 6.44 ft at 3:30AM Sep 28, 2023Observed: 6.44 ft at 3:45AM Sep 28, 2023Observed: 6.44 ft at 4:00AM Sep 28, 2023Observed: 6.43 ft at 4:15AM Sep 28, 2023Observed: 6.43 ft at 4:30AM Sep 28, 2023Observed: 6.43 ft at 4:45AM Sep 28, 2023Observed: 6.43 ft at 5:00AM Sep 28, 2023Observed: 6.43 ft at 5:15AM Sep 28, 2023Observed: 6.43 ft at 5:30AM Sep 28, 2023Observed: 6.43 ft at 5:45AM Sep 28, 2023Observed: 6.42 ft at 6:00AM Sep 28, 2023Observed: 6.42 ft at 6:15AM Sep 28, 2023Observed: 6.42 ft at 6:30AM Sep 28, 2023Observed: 6.42 ft at 6:45AM Sep 28, 2023Observed: 6.42 ft at 7:00AM Sep 28, 2023Observed: 6.42 ft at 7:15AM Sep 28, 2023Observed: 6.42 ft at 7:30AM Sep 28, 2023Observed: 6.41 ft at 7:45AM Sep 28, 2023Observed: 6.42 ft at 8:00AM Sep 28, 2023Observed: 6.41 ft at 8:15AM Sep 28, 2023Observed: 6.41 ft at 8:30AM Sep 28, 2023Observed: 6.41 ft at 8:45AM Sep 28, 2023Observed: 6.41 ft at 9:00AM Sep 28, 2023Observed: 6.41 ft at 9:15AM Sep 28, 2023Observed: 6.41 ft at 9:30AM Sep 28, 2023Observed: 6.41 ft at 9:45AM Sep 28, 2023Observed: 6.41 ft at 10:00AM Sep 28, 2023Observed: 6.41 ft at 10:15AM Sep 28, 2023Observed: 6.41 ft at 10:30AM Sep 28, 2023Observed: 6.41 ft at 10:45AM Sep 28, 2023Observed: 6.41 ft at 11:00AM Sep 28, 2023Observed: 6.41 ft at 11:15AM Sep 28, 2023Observed: 6.4 ft at 11:30AM Sep 28, 2023Observed: 6.4 ft at 11:45AM Sep 28, 2023Observed: 6.4 ft at 12:00PM Sep 28, 2023Observed: 6.4 ft at 12:15PM Sep 28, 2023Observed: 6.4 ft at 12:30PM Sep 28, 2023Observed: 6.4 ft at 12:45PM Sep 28, 2023Observed: 6.4 ft at 1:00PM Sep 28, 2023Observed: 6.4 ft at 1:15PM Sep 28, 2023Observed: 6.4 ft at 1:30PM Sep 28, 2023Observed: 6.4 ft at 1:45PM Sep 28, 2023Observed: 6.4 ft at 2:00PM Sep 28, 2023Highest Forecast: 6.4 ft 8:00PM Sep 28, 2023Forecast: 6.3 ft 2:00AM Sep 29, 2023Forecast: 6.3 ft 8:00AM Sep 29, 2023Forecast: 6.3 ft 2:00PM Sep 29, 2023Forecast: 6.3 ft 8:00PM Sep 29, 2023Forecast: 6.2 ft 2:00AM Sep 30, 2023Forecast: 6.2 ft 8:00AM Sep 30, 2023Forecast: 6.2 ft 2:00PM Sep 30, 2023Forecast: 6.1 ft 8:00PM Sep 30, 2023Forecast: 6.1 ft 2:00AM Oct 01, 2023Forecast: 6.1 ft 8:00AM Oct 01, 2023USGS--Water Resources of the United StatesGRNM1(plotting HGIRG) Graph Created (2:31PM Sep 28, 2023)ObservedForecast (issued 11:13AM Sep 28)Latest observed value: 6.4 ft at 2:00 PM EDT 28-Sep-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: 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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