US Bridges

SR-21 SB over Little Black Creek

Fair

Clay County, Florida · 3.4 Mi. N. of CR-220 · Structure no. 710056

Built
1985
40 years old, rebuilt 2010
Condition
Fair
inspected August 2024
Type
Slab
Prestressed Concrete
Length
350 ft
10 main spans
Daily traffic
24,000
2023 count
Owner
State
State Highway Agency

About this bridge

SR-21 SB over Little Black Creek is a prestressed concrete slab carrying SR-21 SB over Little Black Creek in Clay County, Florida. It was built in 1985 and reconstructed in 2010, so it is 40 years old, younger 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 24,000 vehicles a day, roughly 6% of them trucks, projected to reach 41,640 by 2045. The structure is 350 ft (106.7 m) long and 53 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSR-21 SB
CrossesLittle Black Creek
Location3.4 Mi. N. of CR-220
RouteState Highway 21
CountyClay County
StateFlorida
Coordinates30.11759, -81.80812
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
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 rating46.8 US tons
Inventory rating38.9 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans10
Design loadHS 20
Structure length350 ft (106.7 m)
Longest span35 ft (10.7 m)
Deck width53 ft (16.2 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,000 (2023)
Projected traffic41,640 by 2045
Trucks6%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 SR-21 SB over Little Black Creek built?

It was built in 1985, making it 40 years old in 2025. It was reconstructed in 2010.

What condition is SR-21 SB over Little Black 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 August 2024.

How much traffic does SR-21 SB over Little Black Creek carry?

About 24,000 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is SR-21 SB over Little Black Creek?

The structure is 350 ft (106.7 m) long with a longest span of 35 ft (10.7 m) and a deck 53 ft wide.

Who owns SR-21 SB over Little Black Creek?

It is owned by the State Highway Agency.