US Bridges

SR-21 over US-17 (SR-15)

Fair

Duval County, Florida · Blanding BLVD./US-17 & RR · Structure no. 720118

Built
1968
57 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
495 ft
8 main spans
Daily traffic
26,500
2022 count
Owner
State
State Highway Agency

About this bridge

SR-21 over US-17 (SR-15) is a prestressed concrete stringer/multi-beam or girder carrying SR-21 over US-17 (SR-15) in Duval County, Florida. It was built in 1968, so it is 57 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 26,500 vehicles a day, roughly 4% of them trucks, projected to reach 45,978 by 2044. The structure is 495 ft (150.9 m) long and 67 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR-21
CrossesUS-17 (SR-15)
LocationBlanding BLVD./US-17 & RR
RouteState Highway 21
CountyDuval County
StateFlorida
Coordinates30.29583, -81.72056
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.1 US tons
Inventory rating35.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length495 ft (150.9 m)
Longest span75 ft (22.9 m)
Deck width67 ft (20.5 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,500 (2022)
Projected traffic45,978 by 2044
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR-21 over US-17 (SR-15) built?

It was built in 1968, making it 57 years old in 2025.

What condition is SR-21 over US-17 (SR-15) 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 December 2023.

How much traffic does SR-21 over US-17 (SR-15) carry?

About 26,500 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is SR-21 over US-17 (SR-15)?

The structure is 495 ft (150.9 m) long with a longest span of 75 ft (22.9 m) and a deck 67 ft wide.

Who owns SR-21 over US-17 (SR-15)?

It is owned by the State Highway Agency.