US Bridges

SR1004 over Flat River

Fair

Durham County, North Carolina · 0.3 Mi. N. Jct. SR1680 · Structure no. 000000000630272

Built
1981
44 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
265 ft
4 main spans
Daily traffic
3,800
2021 count
Owner
State
State Highway Agency

About this bridge

SR1004 over Flat River is a prestressed concrete stringer/multi-beam or girder carrying SR1004 over Flat River in Durham County, North Carolina. It was built in 1981, so it is 44 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 3,800 vehicles a day, roughly 7% of them trucks, projected to reach 7,600 by 2040. The structure is 265 ft (80.7 m) long and 35 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesSR1004
CrossesFlat River
Location0.3 Mi. N. Jct. SR1680
RouteState Highway 1004
CountyDurham County
StateNorth Carolina
Coordinates36.13153, -78.82797
Functional classRural Major 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4 (+2 approach)
Design loadHS 20 + Mod
Structure length265 ft (80.7 m)
Longest span65 ft (19.8 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,800 (2021)
Projected traffic7,600 by 2040
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR1004 over Flat River built?

It was built in 1981, making it 44 years old in 2025.

What condition is SR1004 over Flat River 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 June 2023.

How much traffic does SR1004 over Flat River carry?

About 3,800 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is SR1004 over Flat River?

The structure is 265 ft (80.7 m) long with a longest span of 65 ft (19.8 m) and a deck 35 ft wide.

Who owns SR1004 over Flat River?

It is owned by the State Highway Agency.