US Bridges

CR 121 over Branch of Deep Creek

Good

Nassau County, Florida · 0.9 MI North of US 90 · Structure no. 740044

Built
1950
75 years old
Condition
Good
inspected June 2024
Type
Culvert
Concrete
Length
25 ft
3 main spans
Daily traffic
3,100
2024 count
Owner
County
County Highway Agency

About this bridge

CR 121 over Branch of Deep Creek is a concrete culvert carrying CR 121 over Branch of Deep Creek in Nassau County, Florida. It was built in 1950, so it is 75 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 3,100 vehicles a day, roughly 5% of them trucks, projected to reach 5,378 by 2046. The structure is 25 ft (7.7 m) long. If it were closed, the detour would be 6.8 mi (11 km).

CarriesCR 121
CrossesBranch of Deep Creek
Location0.9 MI North of US 90
RouteCounty Highway 121
StateFlorida
Coordinates30.31481, -82.00847
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating27.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadUnknown
Structure length25 ft (7.7 m)
Longest span9 ft (2.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,100 (2024)
Projected traffic5,378 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 121 over Branch of Deep Creek built?

It was built in 1950, making it 75 years old in 2025.

What condition is CR 121 over Branch of Deep Creek 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 June 2024.

How much traffic does CR 121 over Branch of Deep Creek carry?

About 3,100 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is CR 121 over Branch of Deep Creek?

The structure is 25 ft (7.7 m) long with a longest span of 9 ft (2.7 m).

Who owns CR 121 over Branch of Deep Creek?

It is owned by the County Highway Agency.