US Bridges

SR1999 over I40

Fair

Durham County, North Carolina · 0.3 MI N JCT Nc 54 · Structure no. 000000000630224

Built
1973
52 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
231 ft
2 main spans
Daily traffic
24,000
2019 count
Owner
State
State Highway Agency

About this bridge

SR1999 over I40 is a steel continuous stringer/multi-beam or girder carrying SR1999 over I40 in Durham County, North Carolina. It was built in 1973, so it is 52 years old, older than the North Carolina average of 38.7 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 24,000 vehicles a day, roughly 6% of them trucks, projected to reach 48,000 by 2040. The structure is 231 ft (70.4 m) long and 94 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSR1999
CrossesI40
Location0.3 MI N JCT Nc 54
RouteState Highway 1999
CountyDurham County
StateNorth Carolina
Coordinates35.89443, -78.86006
Functional classUrban Minor 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.9 US tons
Inventory rating46 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length231 ft (70.4 m)
Longest span118 ft (35.9 m)
Deck width94 ft (28.6 m)
Roadway width92 ft (28 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,000 (2019)
Projected traffic48,000 by 2040
Trucks6%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed0.6 mi (1 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 SR1999 over I40 built?

It was built in 1973, making it 52 years old in 2025.

What condition is SR1999 over I40 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 August 2023.

How much traffic does SR1999 over I40 carry?

About 24,000 vehicles per day (2019 count), of which roughly 6% are trucks.

How long is SR1999 over I40?

The structure is 231 ft (70.4 m) long with a longest span of 118 ft (35.9 m) and a deck 94 ft wide.

Who owns SR1999 over I40?

It is owned by the State Highway Agency.