Texas · Junction, TX
South Llano River float season
Gauge 08149900 on the South Llano River State Park into Junction. Spring-fed and reliably flowing beneath a state park's turkey roosts, this is the go-to summer float when much of the Hill Country runs dry.
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 South Llano River. Provisional data — subject to revision.
The year on this river
In a typical year at the Junction gauge, the South Llano River runs fullest May–Jul and leanest Feb–Apr. The swing is small by river standards — flows hold fairly steady through the seasons, which usually points to springs or dam releases doing the work. Half of all past June days at this gauge ran above 69 CFS; the April median is 52 CFS.
| Month | Typical flow (CFS) | Relative volume |
|---|---|---|
| January | 55 | |
| February | 54 | |
| March | 53 | |
| April | 52 | |
| May | 58 | |
| June | 69 | |
| July | 55 | |
| August | 52 | |
| September | 59 | |
| October | 56 | |
| November | 62 | |
| December | 59 |
Record context
This gauge has measured daily flow since 2013 — 13 years of record. The largest daily average ever logged here was 20,000 CFS, in October 2019. 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 Texas float rivers
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Blanco River
Wimberley through the cypress-lined bends toward Five Mile Dam near Kyle
Fullest: Mar–May
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Brazos River
Below Morris Sheppard Dam at Possum Kingdom down to the Highway 180 bridge
Fullest: Jun–Aug
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Colorado River
El Camino Real paddling trail from Bastrop toward Smithville
Fullest: May–Jul
-
Comal River
Prince Solms Park through the Tube Chute to the Guadalupe confluence
Fullest: Jan–Mar
-
Frio River
Garner State Park through the Concan crossings
Fullest: Mar–May
-
Guadalupe River
Canyon Dam tailrace from Sattler through the Horseshoe Loop toward New Braunfels
Fullest: Apr–Jun
Common questions
When is the South Llano River usually at its fullest?
At the Junction gauge, the fullest stretch of a typical year is May–Jul, with the single highest monthly median in June (about 69 CFS). The leanest months are usually Feb–Apr. This river holds unusually steady across the year, so the swing between those extremes is small.
What is a typical summer flow on the South Llano River?
The July median at this gauge is about 55 CFS — half of past Julys ran higher, half lower. Check the ribbon chart above to see how summer compares with the rest of the year here.
Is the South Llano 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 13 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 08149900 (S Llano Rv at Flat Rock Ln at Junction, TX), chosen because it best represents the South Llano River State Park into Junction. Daily records here reach back to 2013.
Data: USGS gauge 08149900, approved daily records 2013–2026, retrieved 2026-08-07. Live readings are provisional and subject to revision. U.S. Geological Survey data is public domain.