US Bridges

CR 12 over Johnson Mill Brch

Fair

Liberty County, Florida · 11.9 Miles West of SR 65 · Structure no. 560028

Built
1952
73 years old, rebuilt 1960
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
31 ft
3 main spans
Daily traffic
2,100
2023 count
Owner
County
County Highway Agency

About this bridge

CR 12 over Johnson Mill Brch is a concrete culvert carrying CR 12 over Johnson Mill Brch in Liberty County, Florida. It was built in 1952 and reconstructed in 1960, so it is 73 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 2,100 vehicles a day, roughly 11% of them trucks, projected to reach 2,310 by 2043. The structure is 31 ft (9.5 m) long. If it were closed, the detour would be 26.1 mi (42 km).

Location

Open in Google Maps
CarriesCR 12
CrossesJohnson Mill Brch
Location11.9 Miles West of SR 65
RouteCounty Highway 12
CountyLiberty County
StateFlorida
Coordinates30.33451, -84.99406
Functional classRural Minor 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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating35.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length31 ft (9.5 m)
Longest span11 ft (3.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,100 (2023)
Projected traffic2,310 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.1 mi (42 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 CR 12 over Johnson Mill Brch built?

It was built in 1952, making it 73 years old in 2025. It was reconstructed in 1960.

What condition is CR 12 over Johnson Mill Brch 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 January 2025.

How much traffic does CR 12 over Johnson Mill Brch carry?

About 2,100 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is CR 12 over Johnson Mill Brch?

The structure is 31 ft (9.5 m) long with a longest span of 11 ft (3.3 m).

Who owns CR 12 over Johnson Mill Brch?

It is owned by the County Highway Agency.