If the creek near Lost Creek Boulevard is still moving in October, why are Twin Falls and Sculpture Falls down to still water? Both are on the same creek, a few miles apart. In its reading for 5 a.m. on October 5, 2026, the live condition tracker at ATX Things listed all four named Greenbelt swimming holes as "pools only." Sculpture Falls, Twin Falls, Gus Fruh and Campbell's Hole each had standing water in the plunge pool and no cascade. Upstream, the USGS gauge at Lost Creek recorded a daily mean of 1.3 cubic feet per second on October 4. That's thin, but it is flowing.
The gap is normal, and it goes back decades. The water hasn't gone anywhere. Most of it is underground.
One Creek, Three Very Different Years
Three USGS gauges measure Barton Creek between the Hill Country and Barton Springs. Over the first 277 days of 2026, they told three different stories. The tracker counts each day with a daily mean of 1 cfs or more, the level at which the falls start running.
| USGS gauge | Position relative to the recharge zone | Days at 1 cfs or more in 2026, through October 4 | Daily mean, October 4, 2026 |
|---|---|---|---|
| Barton Creek at Lost Creek, 08155240 | Upstream | 226 of 277 | 1.3 cfs |
| Barton Creek at Loop 360, 08155300 | Within | 14 of 277 | 0.0 cfs |
| Barton Creek above Barton Springs, 08155400 | Within | 9 of 277 | 0.0 cfs |
The second column comes from the Barton Springs Edwards Aquifer Conservation District. It puts the Lost Creek gauge upstream of the Edwards Aquifer recharge zone and both lower gauges inside it. That line explains the table. The Lost Creek gauge sits on the reach that runs past the Barton Creek and Lost Creek neighborhoods, and that reach behaves like a Hill Country stream. Once the creek crosses into the recharge zone near the Greenbelt, its behavior changes.
The long-term record shows the same pattern. Across 49 years of USGS daily statistics at Loop 360, the median daily mean for October 4 is 0.0 cfs. At that gauge, the median day falls below 1 cfs in every month of the year. At Lost Creek, the October 4 median across 37 years is 0.8 cfs. This year's 1.3 cfs falls between the 50th and 75th percentiles for the date. So by the standard of an average October, the creek upstream is in decent shape this week.
Where the Water Goes
The U.S. Geological Survey explains that most recharge to the Barton Springs segment of the Edwards Aquifer comes from losing streams, which are creeks that give water to the ground as they cross the unconfined recharge zone. Fractures and karst conduits worn into the limestone can move surface water underground quickly.
A City of Austin watershed study from October 1997 put rough numbers on this for the reach between Lost Creek and Loop 360. It estimated that flows at Lost Creek below roughly 20 to 30 cfs were lost entirely to recharge before reaching Loop 360. Flows between 30 and 130 cfs lost about 30 cfs, and above 130 cfs about 23 percent of the flow went underground. Those figures are a nearly 30-year-old estimate, not a current measurement. They still match the 2026 gauge record. A creek that only now and then runs above 20 or 30 cfs upstream will reach the Greenbelt falls only now and then.
This week's readings show the effect on a small scale. The Lost Creek gauge peaked at 4.4 cfs at 12:20 p.m. on Thursday, October 1. Loop 360 peaked at 0.2 cfs the next day, and the gauge above Barton Springs reached 0.1 cfs. Nearly all of that small pulse went into the ground before reaching the trail.
The water comes back at Barton Springs Pool, which is fed by the aquifer and stays around 68 to 70 degrees all year whatever the creek gauges say. The rain that crosses the upper creek in October ends up at the spring-fed pool downtown. The Greenbelt swimming holes don't get it.
What It Took to Fill the Greenbelt in June
That math is why June mattered. On June 16, KXAN reported that the Greenbelt was flowing at pre-2020 levels after weeks of rain. The Flats and Campbell's Hole, between the Spyglass entrance and Barton Springs, had been bare rock a couple of weeks earlier. White-water kayakers were running The Flats. One of them, James Gill, told the station he had paddled Barton Creek since 2008:
"Well, we've been checking for the last six years, this is about the first time we've been able to do it since June of 2019."
Over the past 12 months, the highest daily means reached 470 cfs at Lost Creek, 575 cfs at Loop 360 and 584 cfs above Barton Springs. Only when flows get that high does the creek carry more water than the limestone can absorb, and the lower Greenbelt fills from end to end.
Even then, the City advised people not to get in. Austin Parks and Recreation said water recreation was not advised, citing the water level, fast current and stormwater pollution. Shay Hlavaty of the Barton Springs Edwards Aquifer Conservation District told KXAN that heavy rain washes bacteria off streets and from pet waste into the creek. The weeks when the creek runs high are also the weeks when the water is least suited to swimming.
Reading the Gauges Before a Fall Hike
Since the reach by the neighborhood and the reach at the falls behave so differently, a glance at the creek near Lost Creek tells you little about Sculpture Falls. ATX Things uses these flow bands for the swimming holes:
- Under 1 cfs: pools only. The cascades stop, and the plunge pools hold still, warming water.
- 1 to 5 cfs: low. The creek is running, but thin.
- 5 to 15 cfs: fair.
- 15 to 50 cfs: good, and the range the site calls ideal for most holes.
- 50 to 120 cfs: strong.
- Above roughly 120 cfs: dangerous currents.
Sculpture Falls sits between the Lost Creek and Loop 360 gauges, so the tracker estimates its flow from both. Its pool lasts through dry spells, but the cascade slows to a trickle. Gus Fruh, a deep pool against a cliff wall below Loop 360, holds its depth better than the upstream falls in low water. The swimming-hole numbers are model estimates. The raw readings are public on the USGS Lost Creek gauge page and the USGS Loop 360 gauge page. Austin Parks says its staff do not monitor creek levels, which can change fast, and points visitors to USGS and LCRA monitors.
When the creek is low, the trail itself is the main attraction. From the Barton Creek side, three public trailheads are the usual ways in:
- Loop 360 trailhead, 3753 S. Capital of Texas Hwy. northbound. Free dedicated lot, composting restrooms, and access to the mile 2 to 4.5 section. From here the trail heads west toward Twin Falls and Sculpture Falls.
- Trail's End at Camp Craft, 1712 Camp Craft Rd. Leads to the Hill of Life. Street parking is paid from 8 a.m. to 8 p.m., and a restroom is about 0.05 miles away.
- Gaines Park at MoPac, 3918 S. MoPac Expy. service road. Access to Twin Falls with limited free street parking and no restroom.
The City's Greenbelt materials don't list a public trailhead at Lost Creek Boulevard or in Barton Creek Wilderness Park. The reach that has run longest this year is mostly a creek you see from the neighborhood, with no public trail down to it.
October on the Creek
The City says the Barton Creek Greenbelt will stay open through Austin City Limits. Nearby streets and parking lots will close for the second festival weekend, October 9 to 11.
Over three Saturdays this month, Austin Parks Foundation, Austin Parks and Recreation and Siglo Group are running Restoration Reset volunteer shifts on the Greenbelt. Volunteers learn invasive species removal, trail construction, erosion control, and native seed collection and planting. Each shift runs 9 a.m. to noon:
- October 10: Spyglass Trailhead, 1601 Spyglass Dr.
- October 17: Spyglass Trailhead.
- October 24: Gus Fruh Trailhead.
This kind of work affects the aquifer too. The conservation district notes that native vegetation and restoration on protected land help water soak into the ground, while impervious development reduces it.
Farther west, Austin Water's Wildlands program has scheduled a guided four-mile hike called "Big Views on Little Barton" for Saturday, October 31. It covers a 928-acre conservation tract near Bee Cave, Hamilton Pool and Highway 71, along Little Barton Creek rather than the main creek. Austin Water says its Wildlands are conservation land, not parks, and some areas can only be visited on guided hikes or volunteer events.
Upstream, The Nature Conservancy's Barton Creek Habitat Preserve covers 4,050 acres with four miles of creek frontage. It is open by appointment only, plus scheduled events and volunteer days. Hill Country Conservancy describes the Violet Crown Trail as 13 miles from Zilker Park to the Wildflower Center. It says the planned 30-mile route will pass through Barton Creek Wilderness Park and the Water Quality Protection Lands, which would put a public trail on that upper reach in the future.
The Dara Luxury Group keeps track of how this part of west Austin works, from the creek gauges to the trailheads. If you're thinking about what your home near Barton Creek is worth, Dara Allen can prepare a Private Home Valuation built on the same close knowledge of the area.
