Texas Porch

Flood

The Brazos River forms the eastern edge of Austin County — and a real flood risk

The Brazos River runs along Austin County's eastern border. Property near the river and its tributaries can sit in a FEMA high-risk flood zone. That can mean required flood insurance and stricter building rules.

Austin County Home & Property

The Brazos River forms the eastern boundary of Austin County. The river floods regularly after heavy rain. Flooding can come from storms that hit the county directly, or from heavy rain upstream that arrives days later.

Homes and land near the river, Allens Creek, and other streams can fall inside FEMA Zone AE. Zone AE is the high-risk flood zone. If your mortgage is federally backed and your home is in Zone AE, flood insurance is required.

Before buying property in Austin County, search the address at the FEMA Flood Map Service Center. Even land outside a mapped floodplain can still flood. Maps are updated over time, and some rural areas lack detailed flood studies. The Texas Water Development Board has a statewide flood viewer with current information.

The Brazos River Authority is developing a proposed Allens Creek Reservoir near the town of Wallis, where Allens Creek meets the Brazos. The goal is to boost regional water supply and reduce groundwater pumping. Construction is still many years away. If you own land near that confluence, check the BRA's project page for the latest boundary information.

Source to confirm: FEMA Flood Map Service Center

More Austin County notes

Property tax

Austin County has two separate property tax offices

The appraisal district values your property and collects taxes. The tax assessor-collector handles vehicle titles and registration. They are different offices at different addresses.

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Agriculture / Property tax

Productive land in Austin County can qualify for ag valuation

Landowners who farm, ranch, or manage land for wildlife may qualify for ag valuation (1-d-1). It taxes land on what it produces, not what it would sell for — often a much lower bill.

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State park / Outdoor recreation

Stephen F. Austin State Park offers camping and trails near the Brazos

Stephen F. Austin State Park sits along the Brazos River in San Felipe and offers year-round camping, five miles of trails, and easy access to the adjacent state historic site.

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History / State historic site

San Felipe de Austin was the original capital of Texas's first Anglo colony

The San Felipe de Austin State Historic Site in Austin County preserves the townsite of the first colonial capital of Stephen F. Austin's settlement — burned by its own residents during the Texas Revolution and now open to the public with a museum and trails.

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