US Bridges

SP 348 over Lake Carolyn

Fair

Dallas County, Texas · 2.2 MI NW of Lp 12 · Structure no. 180570035304126

Built
1975
50 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
30 ft
1 main span
Daily traffic
15,941
2023 count
Owner
State
State Highway Agency

About this bridge

SP 348 over Lake Carolyn is a concrete stringer/multi-beam or girder carrying SP 348 over Lake Carolyn in Dallas County, Texas. It was built in 1975, so it is 50 years old, older than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 15,941 vehicles a day, roughly 10% of them trucks, projected to reach 47,530 by 2033. The structure is 30 ft (9.1 m) long and 88 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSP 348
CrossesLake Carolyn
Location2.2 MI NW of Lp 12
RouteState Highway 348
CountyDallas County
StateTexas
Coordinates32.87562, -96.93528
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating75 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width88 ft (26.9 m)
Roadway width73 ft (22.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,941 (2023)
Projected traffic47,530 by 2033
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SP 348 over Lake Carolyn built?

It was built in 1975, making it 50 years old in 2025.

What condition is SP 348 over Lake Carolyn in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2024.

How much traffic does SP 348 over Lake Carolyn carry?

About 15,941 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SP 348 over Lake Carolyn?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 88 ft wide.

Who owns SP 348 over Lake Carolyn?

It is owned by the State Highway Agency.