US Bridges

CR-579 over Little Manatee River

Fair

Hillsborough County, Florida · 3.5MI South of SR-674 · Structure no. 100260

Built
1954
71 years old
Condition
Fair
inspected May 2024
Type
Slab
Concrete
Length
150 ft
10 main spans
Daily traffic
800
2024 count
Owner
County
County Highway Agency

About this bridge

CR-579 over Little Manatee River is a concrete slab carrying CR-579 over Little Manatee River in Hillsborough County, Florida. It was built in 1954, so it is 71 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 800 vehicles a day, roughly 9% of them trucks, projected to reach 1,388 by 2042. The structure is 150 ft (45.7 m) long and 22 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesCR-579
CrossesLittle Manatee River
Location3.5MI South of SR-674
RouteCounty Highway 579
StateFlorida
Coordinates27.66279, -82.301
Functional classRural Minor Collector

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 inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37.3 US tons
Inventory rating22.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans10
Design loadH 20
Structure length150 ft (45.7 m)
Longest span15 ft (4.6 m)
Deck width22 ft (6.6 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic800 (2024)
Projected traffic1,388 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 CR-579 over Little Manatee River built?

It was built in 1954, making it 71 years old in 2025.

What condition is CR-579 over Little Manatee 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 May 2024.

How much traffic does CR-579 over Little Manatee River carry?

About 800 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is CR-579 over Little Manatee River?

The structure is 150 ft (45.7 m) long with a longest span of 15 ft (4.6 m) and a deck 22 ft wide.

Who owns CR-579 over Little Manatee River?

It is owned by the County Highway Agency.