Congress Avenue Bridge Bats
The Ann W. Richards Congress Avenue Bridge in downtown Austin hosts the largest urban bat colony in North America, with between 750,000 and 1.5 million Mexican free-tailed bats roosting underneath it. The colony is seasonal, present roughly spring through fall, and its dusk emergence is free to watch from the bridge, the banks of Lady Bird Lake, or a boat on the water.
Important Information:
What to Bring:
- A layer for after dark; Austin evenings cool down fast once the sun is gone, and the emergence happens right at dusk.
- Bug spray if you're watching from the shoreline trail rather than the bridge itself.
- Binoculars if you want more than a silhouette view of the emergence from a distance.
About Congress Avenue Bridge Bats
Congress Avenue Bridge Bats
The Ann W. Richards Congress Avenue Bridge in downtown Austin is home to the largest urban bat colony in North America, somewhere between 750,000 and 1.5 million Mexican free-tailed bats roosting in the gaps beneath the bridge deck. Every evening during the warmer months, the colony streams out at dusk in a dense, shifting cloud, a free spectacle that's become one of Austin's signature things to do.
The colony wasn't always welcome here. In the 1980s the bats were widely seen as a nuisance and were at real risk of being exterminated before conservation efforts turned that around. Today the same colony draws roughly 100,000 visitors a year and generates a meaningful economic impact for the city, watched from the bridge itself, the banks of Lady Bird Lake, or a boat out on the water.
✨ Highlights
- Up to 1.5 million Mexican free-tailed bats, the largest urban bat colony in North America.
- A free nightly dusk emergence, visible from the bridge deck or the shoreline trails on either side.
- A maternity colony, with pups raised here through the summer and into fall.
- Multiple viewing options, from the bridge itself to guided boat tours out on Lady Bird Lake.
📖 History
The bats began roosting under the bridge after modifications to its underside created ideal gaps for them, and by the 1980s the colony had grown large enough to draw public concern, with extermination considered before conservation advocates intervened in 1986 and helped shift public opinion. What was once seen as a problem is now one of the city's best- known free attractions.
📍 How to Get There
The Ann W. Richards Congress Avenue Bridge crosses Lady Bird Lake in downtown Austin, a short walk south from the Texas State Capitol along Congress Avenue and just north of the South Congress district.
📌 Good to Know
The colony is seasonal and its exact arrival and departure dates shift year to year with weather; there's nothing to see under the bridge in winter. [CONFIRM current-year season dates and typical emergence time directly before publish; those figures are not sourced in this draft.]
See every tour that stops here on the Austin tours page.
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