River stage
Mammoth Cave, Green River
- River level
- 8.58 ft
- Status
- Below flood stage
- 7-day change
- +0.12 ft
- Recent high
- 36.22 ft
- Recent low
- 8.44 ft
Last reported 2026-10-13 | NWS MMCK2
- 30-day change
- -1.12 ft
- Average
- 11.25 ft
- Readings
- 122
- Data span
- 122 days
- Record crest
- 59.66 ft
In brief
The Green River at Mammoth Cave, KY read 8.58 ft on Oct 13, 2026, 11.42 ft below action stage. That is 1.12 ft lower than 30 days earlier.
Source: National Weather Service gauge MMCK2
River level timeline
Stage threshold profile
Highest crests on record
| Rank | Crest | Date |
|---|---|---|
| 1 | 59.66 ft | 2025-04-06 |
| 2 | 52.46 ft | 2025-02-18 |
| 3 | 52.00 ft | 1937-01-24 |
| 4 | 50.94 ft | 2021-03-03 |
| 5 | 50.50 ft | 1913-01-01 |
| 6 | 43.00 ft | 1949-02-18 |
| 7 | 42.62 ft | 2019-02-26 |
| 8 | 42.60 ft | 1935-01-01 |
Flood crests recorded at this gauge by the National Weather Service.
What happens at each level
- 20.00 ft
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.
- 20.10 ft
Launching of paddle craft is prohibited.
- 32.00 ft
Green River Ferry closes to all traffic due to high water.
- 42.00 ft
Echo River Spring Trail and parking lot are under water and not accessible.
- 52.00 ft
Cave tours that use the lower levels of the cave are closed.
Written by the local National Weather Service forecast office for this exact gauge.
Frequently asked questions
Is the Green River flooding at Mammoth Cave?
No. The Green River at Mammoth Cave is at 8.58 ft, 11.42 ft below action stage.
What is the flood stage at Mammoth Cave?
The National Weather Service sets action stage 20 ft, minor flooding 32 ft, moderate flooding 57 ft and major flooding 62 ft.
What is the highest the Green River has been at Mammoth Cave?
The highest crest on record is 59.66 ft, on 2025-04-06.
Is the Green River high or low right now at Mammoth Cave?
At 8.58 ft it is higher than 16% of readings over the last 122 days.
Stage and flood information from the NOAA National Weather Service (gauge MMCK2); daily history from the U.S. Geological Survey (site 03309000). Last reading 2026-10-13. For flood safety decisions always follow official National Weather Service warnings.