US Bridges

SH 48 over San Martin Lake

Good

Cameron County, Texas · 8.10 MI NE of FM 511 · Structure no. 210310022007028

Built
2007
18 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
300 ft
4 main spans
Daily traffic
12,608
2024 count
Owner
State
State Highway Agency

About this bridge

SH 48 over San Martin Lake is a prestressed concrete stringer/multi-beam or girder carrying SH 48 over San Martin Lake in Cameron County, Texas. It was built in 2007, so it is 18 years old, younger 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 12,608 vehicles a day, roughly 4% of them trucks, projected to reach 8,860 by 2033. The structure is 300 ft (91.4 m) long and 86 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesSH 48
CrossesSan Martin Lake
Location8.10 MI NE of FM 511
RouteState Highway 48
StateTexas
Coordinates26.00218, -97.29942
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour evaluation has not been made
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length300 ft (91.4 m)
Longest span75 ft (22.9 m)
Deck width86 ft (26.2 m)
Roadway width84 ft (25.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,608 (2024)
Projected traffic8,860 by 2033
Trucks4%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 48 over San Martin Lake built?

It was built in 2007, making it 18 years old in 2025.

What condition is SH 48 over San Martin Lake 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 March 2023.

How much traffic does SH 48 over San Martin Lake carry?

About 12,608 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is SH 48 over San Martin Lake?

The structure is 300 ft (91.4 m) long with a longest span of 75 ft (22.9 m) and a deck 86 ft wide.

Who owns SH 48 over San Martin Lake?

It is owned by the State Highway Agency.