US Bridges

Middle Road over Spell Swamp

Fair

Nassau County, Florida · 5.1 Miles North of US 1 · Structure no. 744308

Built
1976
49 years old
Condition
Fair
inspected June 2024
Type
Culvert
Steel
Length
79 ft
10 main spans
Daily traffic
1,200
2024 count
Owner
County
County Highway Agency

About this bridge

Middle Road over Spell Swamp is a steel culvert carrying Middle Road over Spell Swamp in Nassau County, Florida. It was built in 1976, so it is 49 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 1,200 vehicles a day, roughly 5% of them trucks, projected to reach 2,082 by 2046. The structure is 79 ft (24 m) long. If it were closed, the detour would be 3.1 mi (5 km).

CarriesMiddle Road
CrossesSpell Swamp
Location5.1 Miles North of US 1
RouteCounty Highway 0
StateFlorida
Coordinates30.65111, -81.78861
Functional classRural Major 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
Channel and channel protection7 GoodSome minor problems.
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating70.5 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans10
Design loadUnknown
Structure length79 ft (24 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2024)
Projected traffic2,082 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Middle Road over Spell Swamp built?

It was built in 1976, making it 49 years old in 2025.

What condition is Middle Road over Spell Swamp 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 Middle Road over Spell Swamp carry?

About 1,200 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Middle Road over Spell Swamp?

The structure is 79 ft (24 m) long with a longest span of 8 ft (2.4 m).

Who owns Middle Road over Spell Swamp?

It is owned by the County Highway Agency.