US Bridges

SR-408 over Lk Underhill RD (SR-15)

Fair

Orange County, Florida · SR-408 Wb-Lk Underhill RD · Structure no. 750120

Built
1973
52 years old, rebuilt 2010
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
175 ft
3 main spans
Daily traffic
77,500
2022 count
Owner
Toll Authority
State Toll Authority

About this bridge

SR-408 over Lk Underhill RD (SR-15) is a prestressed concrete stringer/multi-beam or girder carrying SR-408 over Lk Underhill RD (SR-15) in Orange County, Florida. It was built in 1973 and reconstructed in 2010, so it is 52 years old, older than the Florida average of 41.3 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 77,500 vehicles a day, roughly 3% of them trucks, projected to reach 134,462 by 2044. The structure is 175 ft (53.2 m) long and 83 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSR-408
CrossesLk Underhill RD (SR-15)
LocationSR-408 Wb-Lk Underhill RD
RouteState Highway 408
CountyOrange County
StateFlorida
Coordinates28.5385, -81.34183
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.8 US tons
Inventory rating39.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length175 ft (53.2 m)
Longest span80 ft (24.5 m)
Deck width83 ft (25.3 m)
Roadway width80 ft (24.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic77,500 (2022)
Projected traffic134,462 by 2044
Trucks3%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a toll road
National Highway SystemYes

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR-408 over Lk Underhill RD (SR-15) built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 2010.

What condition is SR-408 over Lk Underhill RD (SR-15) 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 March 2024.

How much traffic does SR-408 over Lk Underhill RD (SR-15) carry?

About 77,500 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is SR-408 over Lk Underhill RD (SR-15)?

The structure is 175 ft (53.2 m) long with a longest span of 80 ft (24.5 m) and a deck 83 ft wide.

Who owns SR-408 over Lk Underhill RD (SR-15)?

It is owned by the State Toll Authority.