Green River (KY) near Mammoth Cave
Future / Actual / Minor
OWP 2.0 WWA Modal Title
01/11/2021, 10:04 PM UTC through 01/11/2021, 10:04 PM UTC
Sender
Sent
- Warning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.No secondary data available. Transformations for Flow data and a secondary Y axis cannot be made at this time.
Traces and Thresholds Click to turn on/off display
Observed (OBS) 04/04/2025 5:00 AM CDTOfficial Forecast (FCST) 04/03/2025 9:42 PM CDTCATEGORY STAGE 
Major Flooding 62 ft Moderate Flooding 57 ft Minor Flooding 32 ft Action 20 ft Reliability of the Forecast:
NOTE: Forecasts are issued routinely year-round.
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.
National Water Model Hydrograph
Official NWS streamflow forecasts are produced by NWS hydrologic forecasters for river gauge locations using hydrologic models which are calibrated to that location. This process considers additional guidance and information, including local expertise and experience, to produce the best forecast possible. The NWM output provides supplemental guidance to NWS forecasters and should not be considered an official NWS river forecast.
Flood Impacts
- 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.
Gauge Info
| Coordinates | 37.1800, -86.1125 |
| RFC | OHRFC |
| State | KY |
| WFO | LMK |
| County | Edmonson |
| Data Provider(s) | |
| US Geological Survey | USGS--Water Resources of the United States |
| USGS | 03309000 |
Gauge Location
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 | 1 |
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 | 1 |
| 6. | 43.00 ft | on 02-18-1949 | 1 |
| 7. | 38.10 ft | on 04-16-1948 | 1 |
| 8. | 34.60 ft | on 01-04-1945 | 1 |
| 9. | 31.70 ft | on 02-06-1939 | 1 |
| 10. | 52.00 ft | on 01-24-1937 | 1 |
| 11. | 42.60 ft | on 01-01-1935 | 1 |
| 12. | 50.50 ft | on 01-01-1913 | 1 |
Historic Crests
| 1. | 52.00 ft | on 01-24-1937 | 1 |
| 2. | 50.94 ft | on 03-03-2021 | |
| 3. | 50.50 ft | on 01-01-1913 | 1 |
| 4. | 43.00 ft | on 02-18-1949 | 1 |
| 5. | 42.62 ft | on 02-26-2019 |
Historic Crests
| 1. | 52.00 ft | on 01-24-1937 | 1 |
| 2. | 50.94 ft | on 03-03-2021 | |
| 3. | 50.50 ft | on 01-01-1913 | 1 |
| 4. | 43.00 ft | on 02-18-1949 | 1 |
| 5. | 42.62 ft | on 02-26-2019 | |
| 6. | 42.60 ft | on 01-01-1935 | 1 |
| 7. | 42.00 ft | on 01-09-1950 | 1 |
| 8. | 38.10 ft | on 04-16-1948 | 1 |
| 9. | 38.04 ft | on 12-19-2019 | |
| 10. | 34.60 ft | on 02-12-2018 | |
| 11. | 34.60 ft | on 01-04-1945 | 1 |
| 12. | 31.70 ft | on 02-06-1939 | 1 |
Low Water Records
Low Water Records
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | 471.35 ft |
| moderate Flooding | 466.35 ft |
| minor Flooding | 441.35 ft |
| action | 429.35 ft |
| Latest Value | 444.81 ft |
| Gauge Zero | 409.35 ft |
Unique Local Info
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Potential River Levels Used to Estimate the Chance of Flooding and the Range of Possible River Levels |
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| 10 Day (HEFS) | 10 Day (NAEFS) | River Forecast VS. River Potential |
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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 HydrographHow low could the river get?
Collaborative Agencies
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.
Resources
Hydrologic Resource Links
- River Forecast Centers
- NEW!! Mobile Friendly River Forecasts for the Entire Ohio River
- Text Products
- Past Precipitation
- Forecast Precipitation
- Flash Flood Guidance
- Hydrologic Program Overview
- Interactive Precipitation Map
- Interactive Snowfall Map
- Ohio Basin Water Resources Outlook
- KY Precipitation Frequencies
- IN Precipitation Frequencies
- Inundation Mapping Locations
- 1-7 Day Ensemble River Forecasts
- Ohio River Flows and Velocities
- USGS Waterwatch Toolkit