US Bridges

CR-18 over I-75 (SR-93)

Good

Columbia County, Florida · CR-18 / I-75 · Structure no. 290084

Built
1963
62 years old
Condition
Good
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
257 ft
4 main spans
Daily traffic
1,000
2022 count
Owner
State
State Highway Agency

About this bridge

CR-18 over I-75 (SR-93) is a prestressed concrete stringer/multi-beam or girder carrying CR-18 over I-75 (SR-93) in Columbia County, Florida. It was built in 1963, so it is 62 years old, older than the Florida average of 41.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,000 vehicles a day, roughly 4% of them trucks, projected to reach 1,735 by 2044. The structure is 257 ft (78.3 m) long and 34 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesCR-18
CrossesI-75 (SR-93)
LocationCR-18 / I-75
RouteCounty Highway 18
CountyColumbia County
StateFlorida
Coordinates29.95222, -82.56917
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
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 rating41.6 US tons
Inventory rating35.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length257 ft (78.3 m)
Longest span81 ft (24.7 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2022)
Projected traffic1,735 by 2044
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

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 CR-18 over I-75 (SR-93) built?

It was built in 1963, making it 62 years old in 2025.

What condition is CR-18 over I-75 (SR-93) in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2024.

How much traffic does CR-18 over I-75 (SR-93) carry?

About 1,000 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is CR-18 over I-75 (SR-93)?

The structure is 257 ft (78.3 m) long with a longest span of 81 ft (24.7 m) and a deck 34 ft wide.

Who owns CR-18 over I-75 (SR-93)?

It is owned by the State Highway Agency.