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Hydrograph River at a Glance Download
Green River (KY) near Mammoth Cave Stage (ft)Observed: 18.56 ft at 12:30AM May 20, 2024Observed: 18.56 ft at 12:45AM May 20, 2024Observed: 18.56 ft at 1:00AM May 20, 2024Observed: 18.56 ft at 1:15AM May 20, 2024Observed: 18.54 ft at 1:30AM May 20, 2024Observed: 18.55 ft at 1:45AM May 20, 2024Observed: 18.54 ft at 2:00AM May 20, 2024Observed: 18.55 ft at 2:15AM May 20, 2024Observed: 18.54 ft at 2:30AM May 20, 2024Observed: 18.54 ft at 2:45AM May 20, 2024Observed: 18.54 ft at 3:00AM May 20, 2024Observed: 18.53 ft at 3:15AM May 20, 2024Observed: 18.54 ft at 3:30AM May 20, 2024Observed: 18.53 ft at 3:45AM May 20, 2024Observed: 18.53 ft at 4:00AM May 20, 2024Observed: 18.52 ft at 4:15AM May 20, 2024Observed: 18.52 ft at 4:30AM May 20, 2024Observed: 18.52 ft at 4:45AM May 20, 2024Observed: 18.52 ft at 5:00AM May 20, 2024Observed: 18.51 ft at 5:15AM May 20, 2024Observed: 18.51 ft at 5:30AM May 20, 2024Observed: 18.51 ft at 5:45AM May 20, 2024Observed: 18.51 ft at 6:00AM May 20, 2024Observed: 18.51 ft at 6:15AM May 20, 2024Observed: 18.51 ft at 6:30AM May 20, 2024Observed: 18.5 ft at 6:45AM May 20, 2024Observed: 18.5 ft at 7:00AM May 20, 2024Observed: 18.49 ft at 7:15AM May 20, 2024Observed: 18.49 ft at 7:30AM May 20, 2024Observed: 18.49 ft at 7:45AM May 20, 2024Observed: 18.48 ft at 8:00AM May 20, 2024Observed: 18.49 ft at 8:15AM May 20, 2024Observed: 18.48 ft at 8:30AM May 20, 2024Observed: 18.48 ft at 8:45AM May 20, 2024Observed: 18.48 ft at 9:00AM May 20, 2024Observed: 18.47 ft at 9:15AM May 20, 2024Observed: 18.47 ft at 9:30AM May 20, 2024Observed: 18.48 ft at 9:45AM May 20, 2024Observed: 18.47 ft at 10:00AM May 20, 2024Observed: 18.47 ft at 10:15AM May 20, 2024Observed: 18.47 ft at 10:30AM May 20, 2024Observed: 18.47 ft at 10:45AM May 20, 2024Observed: 18.47 ft at 11:00AM May 20, 2024Observed: 18.47 ft at 11:15AM May 20, 2024Observed: 18.47 ft at 11:30AM May 20, 2024Observed: 18.47 ft at 11:45AM May 20, 2024Observed: 18.46 ft at 12:00PM May 20, 2024Observed: 18.47 ft at 12:15PM May 20, 2024Observed: 18.48 ft at 12:30PM May 20, 2024Observed: 18.47 ft at 12:45PM May 20, 2024Observed: 18.45 ft at 1:00PM May 20, 2024Observed: 18.46 ft at 1:15PM May 20, 2024Observed: 18.47 ft at 1:30PM May 20, 2024Observed: 18.48 ft at 1:45PM May 20, 2024Observed: 18.47 ft at 2:00PM May 20, 2024Observed: 18.48 ft at 2:15PM May 20, 2024Observed: 18.48 ft at 2:30PM May 20, 2024Observed: 18.48 ft at 2:45PM May 20, 2024Observed: 18.48 ft at 3:00PM May 20, 2024Observed: 18.48 ft at 3:15PM May 20, 2024Observed: 18.49 ft at 3:30PM May 20, 2024Observed: 18.47 ft at 3:45PM May 20, 2024Observed: 18.49 ft at 4:00PM May 20, 2024Observed: 18.49 ft at 4:15PM May 20, 2024Observed: 18.5 ft at 4:30PM May 20, 2024Observed: 18.51 ft at 4:45PM May 20, 2024Observed: 18.51 ft at 5:00PM May 20, 2024Observed: 18.52 ft at 5:15PM May 20, 2024Observed: 18.52 ft at 5:30PM May 20, 2024Observed: 18.52 ft at 5:45PM May 20, 2024Observed: 18.52 ft at 6:00PM May 20, 2024Observed: 18.53 ft at 6:15PM May 20, 2024Observed: 18.54 ft at 6:30PM May 20, 2024Observed: 18.54 ft at 6:45PM May 20, 2024Observed: 18.55 ft at 7:00PM May 20, 2024Observed: 18.56 ft at 7:15PM May 20, 2024Observed: 18.56 ft at 7:30PM May 20, 2024Observed: 18.58 ft at 7:45PM May 20, 2024Observed: 18.58 ft at 8:00PM May 20, 2024Observed: 18.59 ft at 8:15PM May 20, 2024Observed: 18.6 ft at 8:30PM May 20, 2024Observed: 18.61 ft at 8:45PM May 20, 2024Observed: 18.61 ft at 9:00PM May 20, 2024Observed: 18.63 ft at 9:15PM May 20, 2024Observed: 18.63 ft at 9:30PM May 20, 2024Observed: 18.64 ft at 9:45PM May 20, 2024Observed: 18.65 ft at 10:00PM May 20, 2024Observed: 18.66 ft at 10:15PM May 20, 2024Observed: 18.67 ft at 10:30PM May 20, 2024Observed: 18.68 ft at 10:45PM May 20, 2024Observed: 18.68 ft at 11:00PM May 20, 2024Observed: 18.69 ft at 11:15PM May 20, 2024Observed: 18.7 ft at 11:30PM May 20, 2024Observed: 18.71 ft at 11:45PM May 20, 2024Observed: 18.73 ft at 12:00AM May 21, 2024Observed: 18.73 ft at 12:15AM May 21, 2024Observed: 18.74 ft at 12:30AM May 21, 2024Observed: 18.75 ft at 12:45AM May 21, 2024Observed: 18.75 ft at 1:00AM May 21, 2024Observed: 18.77 ft at 1:15AM May 21, 2024Observed: 18.77 ft at 1:30AM May 21, 2024Observed: 18.78 ft at 1:45AM May 21, 2024Observed: 18.79 ft at 2:00AM May 21, 2024Observed: 18.8 ft at 2:15AM May 21, 2024Observed: 18.8 ft at 2:30AM May 21, 2024Observed: 18.81 ft at 2:45AM May 21, 2024Observed: 18.82 ft at 3:00AM May 21, 2024Observed: 18.83 ft at 3:15AM May 21, 2024Observed: 18.84 ft at 3:30AM May 21, 2024Observed: 18.84 ft at 3:45AM May 21, 2024Observed: 18.84 ft at 4:00AM May 21, 2024Observed: 18.86 ft at 4:15AM May 21, 2024Observed: 18.86 ft at 4:30AM May 21, 2024Observed: 18.87 ft at 4:45AM May 21, 2024Observed: 18.88 ft at 5:00AM May 21, 2024Observed: 18.88 ft at 5:15AM May 21, 2024Observed: 18.89 ft at 5:30AM May 21, 2024Observed: 18.9 ft at 5:45AM May 21, 2024Observed: 18.91 ft at 6:00AM May 21, 2024Observed: 18.89 ft at 6:15AM May 21, 2024Observed: 18.91 ft at 6:30AM May 21, 2024Observed: 18.91 ft at 6:45AM May 21, 2024Observed: 18.93 ft at 7:00AM May 21, 2024Observed: 18.93 ft at 7:15AM May 21, 2024Observed: 18.93 ft at 7:30AM May 21, 2024Observed: 18.93 ft at 7:45AM May 21, 2024Observed: 18.95 ft at 8:00AM May 21, 2024Observed: 18.96 ft at 8:15AM May 21, 2024Observed: 18.96 ft at 8:30AM May 21, 2024Observed: 18.96 ft at 8:45AM May 21, 2024Observed: 18.97 ft at 9:00AM May 21, 2024Observed: 18.97 ft at 9:15AM May 21, 2024Observed: 18.96 ft at 9:30AM May 21, 2024Observed: 18.97 ft at 9:45AM May 21, 2024Observed: 18.97 ft at 10:00AM May 21, 2024Observed: 18.98 ft at 10:15AM May 21, 2024Observed: 18.98 ft at 10:30AM May 21, 2024Observed: 18.98 ft at 10:45AM May 21, 2024Observed: 18.99 ft at 11:00AM May 21, 2024Observed: 19 ft at 11:15AM May 21, 2024Observed: 18.99 ft at 11:30AM May 21, 2024Observed: 19 ft at 11:45AM May 21, 2024Observed: 19 ft at 12:00PM May 21, 2024Observed: 19 ft at 12:15PM May 21, 2024Observed: 19.01 ft at 12:30PM May 21, 2024Highest Observation: 19.02 ft at 12:45PM May 21, 2024Observed: 19 ft at 1:00PM May 21, 2024Observed: 19.01 ft at 1:15PM May 21, 2024Observed: 19 ft at 1:30PM May 21, 2024Observed: 19 ft at 1:45PM May 21, 2024Observed: 19.01 ft at 2:00PM May 21, 2024Observed: 19.01 ft at 2:15PM May 21, 2024Observed: 19.01 ft at 2:30PM May 21, 2024Observed: 19.01 ft at 2:45PM May 21, 2024Highest Observation: 19.02 ft at 3:00PM May 21, 2024Highest Observation: 19.02 ft at 3:15PM May 21, 2024Observed: 19.01 ft at 3:30PM May 21, 2024Highest Observation: 19.02 ft at 3:45PM May 21, 2024Highest Observation: 19.02 ft at 4:00PM May 21, 2024Observed: 19.01 ft at 4:15PM May 21, 2024Highest Observation: 19.02 ft at 4:30PM May 21, 2024Observed: 19.01 ft at 4:45PM May 21, 2024Observed: 19.01 ft at 5:00PM May 21, 2024Observed: 19.01 ft at 5:15PM May 21, 2024Observed: 19.01 ft at 5:30PM May 21, 2024Observed: 19 ft at 5:45PM May 21, 2024Observed: 19 ft at 6:00PM May 21, 2024Observed: 19.01 ft at 6:15PM May 21, 2024Observed: 19.01 ft at 6:30PM May 21, 2024Observed: 19 ft at 6:45PM May 21, 2024Observed: 19 ft at 7:00PM May 21, 2024Observed: 19 ft at 7:15PM May 21, 2024Observed: 19 ft at 7:30PM May 21, 2024Observed: 18.99 ft at 7:45PM May 21, 2024Observed: 18.99 ft at 8:00PM May 21, 2024Observed: 18.99 ft at 8:15PM May 21, 2024Observed: 18.98 ft at 8:30PM May 21, 2024Observed: 18.97 ft at 8:45PM May 21, 2024Observed: 18.97 ft at 9:00PM May 21, 2024Observed: 18.98 ft at 9:15PM May 21, 2024Observed: 18.97 ft at 9:30PM May 21, 2024Observed: 18.97 ft at 9:45PM May 21, 2024Observed: 18.97 ft at 10:00PM May 21, 2024Observed: 18.96 ft at 10:15PM May 21, 2024Observed: 18.96 ft at 10:30PM May 21, 2024Observed: 18.96 ft at 10:45PM May 21, 2024Observed: 18.95 ft at 11:00PM May 21, 2024Observed: 18.95 ft at 11:15PM May 21, 2024Observed: 18.95 ft at 11:30PM May 21, 2024Observed: 18.94 ft at 11:45PM May 21, 2024Observed: 18.94 ft at 12:00AM May 22, 2024Observed: 18.94 ft at 12:15AM May 22, 2024Observed: 18.94 ft at 12:30AM May 22, 2024Observed: 18.93 ft at 12:45AM May 22, 2024Observed: 18.92 ft at 1:00AM May 22, 2024Observed: 18.93 ft at 1:15AM May 22, 2024Observed: 18.92 ft at 1:30AM May 22, 2024Observed: 18.92 ft at 1:45AM May 22, 2024Observed: 18.92 ft at 2:00AM May 22, 2024Observed: 18.91 ft at 2:15AM May 22, 2024Observed: 18.91 ft at 2:30AM May 22, 2024Observed: 18.91 ft at 2:45AM May 22, 2024Observed: 18.89 ft at 3:00AM May 22, 2024Observed: 18.9 ft at 3:15AM May 22, 2024Observed: 18.9 ft at 3:30AM May 22, 2024Observed: 18.89 ft at 3:45AM May 22, 2024Observed: 18.89 ft at 4:00AM May 22, 2024Observed: 18.89 ft at 4:15AM May 22, 2024Observed: 18.88 ft at 4:30AM May 22, 2024Observed: 18.87 ft at 4:45AM May 22, 2024Observed: 18.88 ft at 5:00AM May 22, 2024Observed: 18.88 ft at 5:15AM May 22, 2024Observed: 18.88 ft at 5:30AM May 22, 2024Observed: 18.87 ft at 5:45AM May 22, 2024Observed: 18.88 ft at 6:00AM May 22, 2024Observed: 18.86 ft at 6:15AM May 22, 2024Observed: 18.87 ft at 6:30AM May 22, 2024Observed: 18.86 ft at 6:45AM May 22, 2024Observed: 18.87 ft at 7:00AM May 22, 2024Observed: 18.86 ft at 7:15AM May 22, 2024Observed: 18.86 ft at 7:30AM May 22, 2024Observed: 18.86 ft at 7:45AM May 22, 2024Observed: 18.85 ft at 8:00AM May 22, 2024Observed: 18.85 ft at 8:15AM May 22, 2024Observed: 18.84 ft at 8:30AM May 22, 2024Observed: 18.85 ft at 8:45AM May 22, 2024Observed: 18.86 ft at 9:00AM May 22, 2024Observed: 18.85 ft at 9:15AM May 22, 2024Observed: 18.85 ft at 9:30AM May 22, 2024Observed: 18.84 ft at 9:45AM May 22, 2024Observed: 18.84 ft at 10:00AM May 22, 2024Observed: 18.84 ft at 10:15AM May 22, 2024Observed: 18.84 ft at 10:30AM May 22, 2024Observed: 18.84 ft at 10:45AM May 22, 2024Observed: 18.84 ft at 11:00AM May 22, 2024Observed: 18.84 ft at 11:15AM May 22, 2024Observed: 18.84 ft at 11:30AM May 22, 2024Observed: 18.83 ft at 11:45AM May 22, 2024Observed: 18.83 ft at 12:00PM May 22, 2024Observed: 18.81 ft at 12:15PM May 22, 2024Observed: 18.83 ft at 12:30PM May 22, 2024Observed: 18.82 ft at 12:45PM May 22, 2024Observed: 18.81 ft at 1:00PM May 22, 2024Observed: 18.83 ft at 1:15PM May 22, 2024Observed: 18.81 ft at 1:30PM May 22, 2024Observed: 18.79 ft at 1:45PM May 22, 2024Observed: 18.81 ft at 2:00PM May 22, 2024Observed: 18.82 ft at 2:15PM May 22, 2024Observed: 18.8 ft at 2:30PM May 22, 2024Observed: 18.8 ft at 2:45PM May 22, 2024Observed: 18.81 ft at 3:00PM May 22, 2024Observed: 18.81 ft at 3:15PM May 22, 2024Observed: 18.79 ft at 3:30PM May 22, 2024Observed: 18.79 ft at 3:45PM May 22, 2024Observed: 18.79 ft at 4:00PM May 22, 2024Observed: 18.8 ft at 4:15PM May 22, 2024Observed: 18.8 ft at 4:30PM May 22, 2024Observed: 18.8 ft at 4:45PM May 22, 2024Observed: 18.78 ft at 5:00PM May 22, 2024Observed: 18.79 ft at 5:15PM May 22, 2024Observed: 18.8 ft at 5:30PM May 22, 2024Observed: 18.8 ft at 5:45PM May 22, 2024Observed: 18.79 ft at 6:00PM May 22, 2024Observed: 18.78 ft at 6:15PM May 22, 2024Observed: 18.79 ft at 6:30PM May 22, 2024Observed: 18.78 ft at 6:45PM May 22, 2024Observed: 18.77 ft at 7:00PM May 22, 2024Observed: 18.78 ft at 7:15PM May 22, 2024Observed: 18.78 ft at 7:30PM May 22, 2024Observed: 18.77 ft at 7:45PM May 22, 2024Observed: 18.77 ft at 8:00PM May 22, 2024Observed: 18.78 ft at 8:15PM May 22, 2024Observed: 18.77 ft at 8:30PM May 22, 2024Observed: 18.76 ft at 8:45PM May 22, 2024Observed: 18.76 ft at 9:00PM May 22, 2024Observed: 18.76 ft at 9:15PM May 22, 2024Observed: 18.76 ft at 9:30PM May 22, 2024Observed: 18.76 ft at 9:45PM May 22, 2024Observed: 18.75 ft at 10:00PM May 22, 2024Observed: 18.75 ft at 10:15PM May 22, 2024Observed: 18.75 ft at 10:30PM May 22, 2024Observed: 18.75 ft at 10:45PM May 22, 2024Observed: 18.75 ft at 11:00PM May 22, 2024Forecast: 18.9 ft 1:00AM May 23, 2024Forecast: 19.1 ft 7:00AM May 23, 2024Forecast: 19.5 ft 1:00PM May 23, 2024Forecast: 20.1 ft 7:00PM May 23, 2024Forecast: 21 ft 1:00AM May 24, 2024Forecast: 21.8 ft 7:00AM May 24, 2024Forecast: 22.3 ft 1:00PM May 24, 2024Highest Forecast: 22.5 ft 7:00PM May 24, 2024Forecast: 22.1 ft 1:00AM May 25, 2024Forecast: 21.3 ft 7:00AM May 25, 2024Forecast: 20.5 ft 1:00PM May 25, 2024Forecast: 19.9 ft 7:00PM May 25, 2024USGS--Water Resources of the United StatesMMCK2(plotting HGIRG) Graph Created (12:25AM May 23, 2024)ObservedForecast (issued 8:39PM May 22)Latest observed value: 18.75 ft at 11:00 PM CDT 22-May-2024. Flood Stage is 32 ft
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (CDT)
XML Data
RSS Files
Datum: NAVD88
Metadata
NOTE: River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time.

NOTE: Forecasts for the Green River (KY) near Mammoth Cave are issued routinely year-round.

Return to Area Map
Upstream Gauge - at Munfordville Upstream Gauge Downstream Gauge Downstream Gauge - near Brownsville
Flood Categories (in feet)
Major Flood Stage: 62
Moderate Flood Stage: 57
Flood Stage: 32
Action Stage: 20
Low Stage (in feet): -9999

Historic Crests
(1) 52.00 ft on 01/24/1937
(2) 50.94 ft on 03/03/2021
(3) 50.50 ft on 01/01/1913
(4) 43.00 ft on 02/18/1949
(5) 42.62 ft on 02/26/2019
(6) 42.60 ft on 01/01/1935
(7) 42.00 ft on 01/09/1950
(8) 38.10 ft on 04/16/1948
(9) 38.04 ft on 12/19/2019
(10) 34.60 ft on 01/04/1945
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 50.94 ft on 03/03/2021
(2) 38.04 ft on 12/19/2019
(3) 42.62 ft on 02/26/2019
(4) 34.60 ft on 02/12/2018
(5) 42.00 ft on 01/09/1950
(6) 43.00 ft on 02/18/1949
(7) 38.10 ft on 04/16/1948
(8) 34.60 ft on 01/04/1945
(9) 31.70 ft on 02/06/1939
(10) 52.00 ft on 01/24/1937
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
57 Cave tours that use the lower levels of the cave are closed.
42 Echo River Spring Trail and parking lot are under water and not accessible.
32 Green River Ferry closes to all traffic due to high water.
20.1 Launching of paddle craft is prohibited.
20 Green River Ferry closes to RV and trailer traffic due to high water. Heavy loads will be at the judgment of the ferry operator considering the 12 ton load limit of ferry. Backcountry camping on the Green River floodplain is prohibited.
Photos
(1) Green River Ferry at Mammoth Cave
(2) North Ferry Approach
(3) South Ferry Approach
(4) Downstream Staff Gauge
(5) Upstream Boat Ramp
(6) Upstream Staff Gauges
Low Water Impacts Collapse
If you notice any errors in the below information, please contact our Webmaster
10.5 Green River Ferry closes to RV/Trailer traffic and heavy loads due to low water.
9.5 Green River Ferry is closed to all traffic due to low water.
About This Location Collapse

Latitude: 37.180000° N, Longitude: 86.112500° W, Horizontal Datum: NAD27

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 32 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 409.35 441.35 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available 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
Potential River Levels
Used to Estimate the Chance of Flooding and the Range of Possible River Levels
10 Day (HEFS) 10 Day (NAEFS) River Forecast VS. River Potential
HEFS Ensemble NAEFS Ensemble River Forecast vs Potential

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.

USGS Average Streamflow Duration Hydrograph
How low could the river get?
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
Louisville Weather Forecast Office
6201 Theiler Lane
Louisville, KY 40229
(502) 969-8842
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