US Bridges

Darby ROAD/CR-578A over I-75 (SR-93)

Good

Pasco County, Florida · 2.2 MI N/O SR-52 · Structure no. 140046

Built
1965
60 years old
Condition
Good
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
299 ft
4 main spans
Daily traffic
850
2025 count
Owner
State
State Highway Agency

About this bridge

Darby ROAD/CR-578A over I-75 (SR-93) is a prestressed concrete stringer/multi-beam or girder carrying Darby ROAD/CR-578A over I-75 (SR-93) in Pasco County, Florida. It was built in 1965, so it is 60 years old, older than the Florida average of 41.3 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 850 vehicles a day, roughly 6% of them trucks, projected to reach 1,474 by 2045. The structure is 299 ft (91.1 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesDarby ROAD/CR-578A
CrossesI-75 (SR-93)
Location2.2 MI N/O SR-52
RouteCounty Highway 578A
CountyPasco County
StateFlorida
Coordinates28.3566, -82.31974
Functional classRural Major Collector

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.
Substructure8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating59 US tons
Inventory rating48 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length299 ft (91.1 m)
Longest span98 ft (29.9 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic850 (2025)
Projected traffic1,474 by 2045
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Darby ROAD/CR-578A over I-75 (SR-93) built?

It was built in 1965, making it 60 years old in 2025.

What condition is Darby ROAD/CR-578A over I-75 (SR-93) 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 January 2025.

How much traffic does Darby ROAD/CR-578A over I-75 (SR-93) carry?

About 850 vehicles per day (2025 count), of which roughly 6% are trucks.

How long is Darby ROAD/CR-578A over I-75 (SR-93)?

The structure is 299 ft (91.1 m) long with a longest span of 98 ft (29.9 m) and a deck 34 ft wide.

Who owns Darby ROAD/CR-578A over I-75 (SR-93)?

It is owned by the State Highway Agency.