Green River in Kentucky
Around here
Around Green River
Data Source: Recreation.gov · Public land: USGS PAD-US
About this river
Green River is a 42.8 mile river. Streamflow is measured at the USGS gauge Green River at Mammoth Cave, KY (site 03309000). The National Hydrography Dataset places it at stream order 8. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1938 to 2026
Green River typically runs highest in February, at a median 4,650 cfs, and lowest in October, at 302 cfs. The highest flow on record for any single day is 55,700 cfs, in 2025.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 4,120 | 1,330 to 8,200 |
| February | 4,650 | 2,320 to 9,600 |
| March | 4,310 | 2,310 to 8,430 |
| April | 3,650 | 1,880 to 6,830 |
| May | 1,330 | 980 to 3,610 |
| June | 917 | 560 to 2,225 |
| July | 784 | 479 to 1,380 |
| August | 623 | 361 to 1,020 |
| September | 332 | 224 to 749 |
| October | 302 | 186 to 704 |
| November | 803 | 380 to 1,975 |
| December | 1,520 | 591 to 4,460 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 25 years of record. Statistics published by the US Geological Survey for Green River at Mammoth Cave, KY (site 03309000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
8 mapped launches sit in the mapped area of Green River, all of them public access. Ramp data comes from the USGS national boat-ramp inventory.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Green River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
See every free widget you can put on your site, including live conditions and a 7 day forecast.
