Kentucky · Munfordville, KY
Green River float season
Gauge 03308500 on the Munfordville through Mammoth Cave National Park to Green River Ferry. An underground-fed river that drifts green and calm beneath the bluffs of Mammoth Cave National Park, with springs boiling up mid-channel from the cave system below.
Right now at this gauge
loading CFS
Checking the live gauge…
Well above typical for this date
Live reading from the USGS gauge page for Green River. Provisional data — subject to revision.
The year on this river
In a typical year at the Munfordville gauge, the Green River runs fullest Jan–Mar and leanest Aug–Oct. Where today's reading falls inside that rhythm matters more than the raw number — the same flow that feels thin in spring can be the summer norm. Half of all past February days at this gauge ran above 4,700 CFS; the September median is 362 CFS.
| Month | Typical flow (CFS) | Relative volume |
|---|---|---|
| January | 3,800 | |
| February | 4,700 | |
| March | 4,280 | |
| April | 2,865 | |
| May | 1,750 | |
| June | 839 | |
| July | 573 | |
| August | 457 | |
| September | 362 | |
| October | 502 | |
| November | 1,240 | |
| December | 2,930 |
Record context
This gauge has measured daily flow since 1970 — 56 years of record. The largest daily average ever logged here was 62,800 CFS, in May 1984. Rivers do that sometimes; it's why the safety panel above isn't decoration.
Planning dates? The trip-window checker shows what flows have historically looked like on any week you pick for this river, or see what a CFS actually looks like.
More Kentucky float rivers
-
Cumberland River
Cumberland River Blueway at Williamsburg above Cumberland Falls
Fullest: Feb–Apr
-
Elkhorn Creek
Forks of the Elkhorn through the palisades below Frankfort
Fullest: Jan–Mar
-
Red River
Red River Gorge scenic stretch from Copperas Creek to Clay City
Fullest: Feb–Apr
-
Rockcastle River
Lower Rockcastle narrows from KY 80 toward Bee Rock
Fullest: Feb–Apr
Common questions
When is the Green River usually at its fullest?
At the Munfordville gauge, the fullest stretch of a typical year is Jan–Mar, with the single highest monthly median in February (about 4,700 CFS). The leanest months are usually Aug–Oct.
What is a typical summer flow on the Green River?
The July median at this gauge is about 573 CFS — half of past Julys ran higher, half lower. Late summer is this river's lean season, so expect readings to drift down as the season goes on.
Is the Green River safe to float right now?
No flow number can answer that, and this site never labels a river safe. What the data can tell you is how today's reading compares with 52 years of this date's history — well above typical means pushier, colder, faster water. Pair that context with a PFD, a look at the river from the bank, and a call to a local outfitter before you commit.
Which USGS gauge does this page use?
USGS gauge 03308500 (GREEN RIVER AT MUNFORDVILLE, KY), chosen because it best represents the Munfordville through Mammoth Cave National Park to Green River Ferry. Daily records here reach back to 1970.
Data: USGS gauge 03308500, approved daily records 1970–2026, retrieved 2026-08-07. Live readings are provisional and subject to revision. U.S. Geological Survey data is public domain.