US Bridges

US-17 (SR-15) over Johnson Slough

Fair

Clay County, Florida · 0.4 Mi. S. of SR-224 · Structure no. 710012

Built
1967
58 years old, rebuilt 2010
Condition
Fair
inspected January 2025
Type
Slab
Prestressed Concrete
Length
75 ft
3 main spans
Daily traffic
51,000
2023 count
Owner
State
State Highway Agency

About this bridge

US-17 (SR-15) over Johnson Slough is a prestressed concrete slab carrying US-17 (SR-15) over Johnson Slough in Clay County, Florida. It was built in 1967 and reconstructed in 2010, so it is 58 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 5 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 51,000 vehicles a day, roughly 10% of them trucks, projected to reach 88,485 by 2045. The structure is 75 ft (22.9 m) long and 99 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesUS-17 (SR-15)
CrossesJohnson Slough
Location0.4 Mi. S. of SR-224
RouteU.S. Route 17
CountyClay County
StateFlorida
Coordinates30.16013, -81.70083
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.9 US tons
Inventory rating54.9 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length75 ft (22.9 m)
Longest span25 ft (7.6 m)
Deck width99 ft (30.3 m)
Roadway width83 ft (25.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic51,000 (2023)
Projected traffic88,485 by 2045
Trucks10%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed16.8 mi (27 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US-17 (SR-15) over Johnson Slough built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 2010.

What condition is US-17 (SR-15) over Johnson Slough 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 2025.

How much traffic does US-17 (SR-15) over Johnson Slough carry?

About 51,000 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is US-17 (SR-15) over Johnson Slough?

The structure is 75 ft (22.9 m) long with a longest span of 25 ft (7.6 m) and a deck 99 ft wide.

Who owns US-17 (SR-15) over Johnson Slough?

It is owned by the State Highway Agency.