US Bridges

CR107 Blackrock RD over Lanceford Creek

Good

Nassau County, Florida · 0.9 MI North of SR 200 · Structure no. 744315

Built
2014
11 years old
Condition
Good
inspected September 2024
Type
Slab
Prestressed Concrete
Length
44 ft
1 main span
Daily traffic
1,900
2024 count
Owner
County
County Highway Agency

About this bridge

CR107 Blackrock RD over Lanceford Creek is a prestressed concrete slab carrying CR107 Blackrock RD over Lanceford Creek in Nassau County, Florida. It was built in 2014, so it is 11 years old, younger 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 1,900 vehicles a day, roughly 4% of them trucks, projected to reach 3,297 by 2046. The structure is 44 ft (13.4 m) long and 37 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesCR107 Blackrock RD
CrossesLanceford Creek
Location0.9 MI North of SR 200
RouteCounty Highway 107
StateFlorida
Coordinates30.63494, -81.52958
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.7 US tons
Inventory rating47.2 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length44 ft (13.4 m)
Longest span44 ft (13.4 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,900 (2024)
Projected traffic3,297 by 2046
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 CR107 Blackrock RD over Lanceford Creek built?

It was built in 2014, making it 11 years old in 2025.

What condition is CR107 Blackrock RD over Lanceford 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 September 2024.

How much traffic does CR107 Blackrock RD over Lanceford Creek carry?

About 1,900 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is CR107 Blackrock RD over Lanceford Creek?

The structure is 44 ft (13.4 m) long with a longest span of 44 ft (13.4 m) and a deck 37 ft wide.

Who owns CR107 Blackrock RD over Lanceford Creek?

It is owned by the County Highway Agency.