US Bridges

SR-574 (m.L. King) over Hillsborough River

Fair

Hillsborough County, Florida · 1.3 Miles West of I-275 · Structure no. 100500

Built
1960
65 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
872 ft
3 main spans
Daily traffic
32,000
2024 count
Owner
State
State Highway Agency

About this bridge

SR-574 (m.L. King) over Hillsborough River is a steel continuous stringer/multi-beam or girder carrying SR-574 (m.L. King) over Hillsborough River in Hillsborough County, Florida. It was built in 1960, so it is 65 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 32,000 vehicles a day, roughly 19% of them trucks, projected to reach 55,520 by 2046. The structure is 872 ft (265.9 m) long and 55 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesSR-574 (m.L. King)
CrossesHillsborough River
Location1.3 Miles West of I-275
RouteState Highway 574
CountyHillsborough County
StateFlorida
Coordinates27.9815, -82.47561
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating64 US tons
Inventory rating38.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+9 approach)
Design loadHS 20 + Mod
Structure length872 ft (265.9 m)
Longest span111 ft (33.7 m)
Deck width55 ft (16.9 m)
Roadway width42 ft (12.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,000 (2024)
Projected traffic55,520 by 2046
Trucks19%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and waterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SR-574 (m.L. King) over Hillsborough River built?

It was built in 1960, making it 65 years old in 2025.

What condition is SR-574 (m.L. King) over Hillsborough River 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 June 2024.

How much traffic does SR-574 (m.L. King) over Hillsborough River carry?

About 32,000 vehicles per day (2024 count), of which roughly 19% are trucks.

How long is SR-574 (m.L. King) over Hillsborough River?

The structure is 872 ft (265.9 m) long with a longest span of 111 ft (33.7 m) and a deck 55 ft wide.

Who owns SR-574 (m.L. King) over Hillsborough River?

It is owned by the State Highway Agency.