US Bridges

US-1 NB (SR-15) over Car Seat Creek

Fair

Nassau County, Florida · 1.9 Mi. N. of SR-200 · Structure no. 740079

Built
1960
65 years old
Condition
Fair
inspected June 2024
Type
Culvert
Concrete
Length
43 ft
4 main spans
Daily traffic
8,100
2023 count
Owner
State
State Highway Agency

About this bridge

US-1 NB (SR-15) over Car Seat Creek is a concrete culvert carrying US-1 NB (SR-15) over Car Seat Creek in Nassau 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 8,100 vehicles a day, roughly 13% of them trucks, projected to reach 14,054 by 2045. The structure is 43 ft (13.1 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesUS-1 NB (SR-15)
CrossesCar Seat Creek
Location1.9 Mi. N. of SR-200
RouteU.S. Route 1
CountyNassau County
StateFlorida
Coordinates30.58838, -81.83004
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.8 US tons
Inventory rating46.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadH 15
Structure length43 ft (13.1 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,100 (2023)
Projected traffic14,054 by 2045
Trucks13%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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-1 NB (SR-15) over Car Seat Creek built?

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

What condition is US-1 NB (SR-15) over Car Seat Creek 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 US-1 NB (SR-15) over Car Seat Creek carry?

About 8,100 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is US-1 NB (SR-15) over Car Seat Creek?

The structure is 43 ft (13.1 m) long with a longest span of 10 ft (3 m).

Who owns US-1 NB (SR-15) over Car Seat Creek?

It is owned by the State Highway Agency.