SP 421 over Martinez Creek
GoodBexar County, Texas · 0.1 MI W of IH 10 · Structure no. 150150029111071
- Built
- 1947
- 78 years old, rebuilt 1992
- Condition
- Good
- inspected August 2024
- Type
- Tee Beam
- Concrete Continuous
- Length
- 137 ft
- 3 main spans
- Daily traffic
- 31,404
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
SP 421 over Martinez Creek is a concrete continuous tee beam carrying SP 421 over Martinez Creek in Bexar County, Texas. It was built in 1947 and reconstructed in 1992, so it is 78 years old, older than the Texas average of 44.4 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 31,404 vehicles a day, roughly 12% of them trucks, projected to reach 45,580 by 2033. The structure is 137 ft (41.8 m) long and 75 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SP 421 over Martinez Creek built?
It was built in 1947, making it 78 years old in 2025. It was reconstructed in 1992.
What condition is SP 421 over Martinez Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.
How much traffic does SP 421 over Martinez Creek carry?
About 31,404 vehicles per day (2019 count), of which roughly 12% are trucks.
How long is SP 421 over Martinez Creek?
The structure is 137 ft (41.8 m) long with a longest span of 40 ft (12.2 m) and a deck 75 ft wide.
Who owns SP 421 over Martinez Creek?
It is owned by the State Highway Agency.