Lake Travis Water Level History

Accessing and Working with Lake Travis Water Level Data

Lake Travis sits on the Colorado River in the Hill Country west of Austin, and its water level history is tracked through a combination of USGS stream gauges, USACE monitoring stations, and the Lower Colorado River Authority. If you need historical data, the most reliable starting point is the USGS National Water Information System. The gauge near Austin (station 08168991) has records going back to 1983, but the primary monitoring point for the lake itself is the USACE gauge at the dam, which has more complete records going back to when the reservoir was impounded in 1942. I spent a few weeks last winter trying to compile a continuous daily pool elevation record for a property assessment project along the west shore. The USGS website would let you download data, but their raw time series has gaps — missing days during sensor maintenance, inconsistent reporting when the lake was near spillway threshold during the 2021 drought, and a few periods where the datum reference shifted slightly between different monitoring stations. I ended up building a script that pulled from three sources and reconciled the discrepancies manually, which took about four hours instead of the thirty minutes it should have taken. The practical way to get this data is to visit waterdata.usgs.gov and search for station 08169500, the USGS gauge at Lake Travis near Austin. You can export daily mean stage in feet above NAVD 88. For pool elevation, you need to add the gauge datum offset, which is approximately 557.0 feet above sea level at the Zero Pool. The USACE provides a cleaner dataset directly through their Upper Colorado Region office, and they report in pool elevation rather than raw stage, which saves you from having to do the conversion yourself.

What most people don't realize is that "Lake Travis water level" isn't a single number — it varies by about two feet across the reservoir depending on flow conditions and wind setup. The official gauge reading at the dam under normal flow conditions will differ from what the water level actually is at your dock on the north end near Bee Cave. During high inflow events after heavy rain, the gradient can be three or four feet from the dam to the north tip. So if you're tracking water level history for a specific property, the dam gauge might be misleading you by a foot or two depending on the season and flow conditions. I also ran into an issue where the 2011 drought records and the 2022-2023 drought records show noticeably different reporting quality. The USGS automated systems seemed to have more frequent outages during the worst of the 2022 drawdown when the lake hit 569 feet — that's roughly 8% of deadpool — and there were several stretches where only estimated values filled the gaps. The USACE sometimes used modeled estimates rather than direct measurements during those periods, and they don't always flag which values are observed versus estimated in their public datasets. You can get a sense of data reliability by checking the auxiliary field parameters in the USGS download; if temperature and conductance readings disappear around the same dates as missing stage data, those stage values are likely interpolated rather than measured.

Key Events in Lake Travis Water Level History

The lake's full pool elevation is 1,001 feet, and conservation pool is 991 feet. That 10-foot band between them is where most of the conflict happens. The lake has dropped below 900 feet only a handful of times in recorded history — most notably during the 1950s drought, the 2011 crisis when it hit around 851 feet, and the extended drought from 2022 through 2024 when it went as low as 569 feet in November 2023. That 569-foot mark is significant because it's close to the elevation where the main power plant intake would become compromised, though the dam has never actually reached that point in operation. The 2011 drought is worth understanding because it shaped current management policy. The lake dropped to about 60% of capacity, shoreline properties lost usable beach area, and the LCRA had to negotiate emergency water releases with the USACE that essentially bypassed normal reservoir operations. That event led to the implementation of the Lower Colorado River Drought Contingency Plan, which changed how releases are managed during extended dry periods. If you're looking at water level history from before 2011 versus after, you'll notice a structural difference in how quickly the lake responds to rainfall events — the post-2011 operating rules prioritize downstream flow requirements more aggressively than the old rules did. On the flip side, the massive flood events in 2015 and 2018 pushed the lake well above conservation pool. The May 2015 event brought record inflows that filled the lake past 1,001 feet and opened the spillways for the first time in over a decade. These high-water periods are actually where the historical record gets more interesting from an engineering perspective. Spillway discharge during those events created significant erosion around the downstream toe of the dam, and the USACE had to do emergency rehabilitation work that wasn't in the original budget cycle. The water level receded relatively quickly after those storm events, but the ecological impact on the Colorado River reaches downstream lasted for months.

Another thing that matters for anyone working with this data: the gauge datum has been re-verified a couple of times. The NAVD 88 adjustment in 2011 shifted all historical elevations slightly, and some older reports you find online may be using the older NAD 83 datum without conversion. If you're comparing a 2005 report to a 2023 report and the numbers don't line up even though they're describing the same physical event, check which vertical datum each source uses. The difference is small — maybe a few inches — but it adds up when you're looking at property lines and setback requirements that are measured in feet.

Where to Download the Data

The USGS data explorer at waterdata.usgs.gov/tx/nwis/ is the free, no-account-needed option. You can select the Lake Travis gauge, choose a date range, and export CSV. The USACE publishes their daily reservoir reports on their Upper Colorado Region website, which includes pool elevation, inflow, outflow, and storage all in one table. Those reports go back to the early 1990s in downloadable format. For records going further back, the LCRA archives their historical pool elevation charts, though those are mostly in PDF format and not machine-readable, which makes automated analysis difficult. If you need pre-processed data without doing the datum conversions yourself, the Colorado River Unit's real-time dashboard at water.texas.gov has a cleaner interface, but the historical archive there only goes back to about 2000. Anything before that requires going to the LCRA archives or the USGS station history page, which is where the manual reconciliation work comes in. For most practical purposes — property evaluations, annual trend analysis, comparing current levels to historical norms — the USGS daily mean data from station 08169500 will serve you fine if you're careful about the datum and the estimated values during extreme low-flow periods.