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FM 531 over S Fork Mustang Creek

Lavaca County, Texas · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

FM 531 over S Fork Mustang Creek in Lavaca County, Texas, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1954, making it 71 years old at the 2025 inventory.
It carries about 398 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 121 of the 262 inventoried bridges in Lavaca County rated fair (46.2%); 10 (3.8%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Continuous steel stringer or multi-beam girder
Length	about 130 ft
Location	0.40 Mi NW of US 77A
NBI structure number	131430026910028
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the Texas department of transportation.

Bridge	Built	Vehicles/day	Condition
US 77 over Lavaca River	1925	14,949	Fair
US 90A over Brushy Creek	2015	8,496	Good
US 77A over Spring Branch	1924	7,210	Fair
US 77A over Smothers Creek	1924	7,210	Good
US 77A/US 90A over Smothers Creek Relief	1930	7,210	Fair
US 77 over West Navidad River	1958	6,738	Good