US Bridges

SR1670 over Norfolk & Western R.R.

Fair

Durham County, North Carolina · 0.1 MI E JCT SR1357 · Structure no. 000000000630244

Built
1985
40 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
137 ft
3 main spans
Daily traffic
14,500
2021 count
Owner
State
State Highway Agency

About this bridge

SR1670 over Norfolk & Western R.R. is a prestressed concrete stringer/multi-beam or girder carrying SR1670 over Norfolk & Western R.R. in Durham County, North Carolina. It was built in 1985, so it is 40 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 14,500 vehicles a day, roughly 6% of them trucks, projected to reach 29,000 by 2040. The structure is 137 ft (41.7 m) long and 62 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSR1670
CrossesNorfolk & Western R.R.
Location0.1 MI E JCT SR1357
RouteState Highway 1670
CountyDurham County
StateNorth Carolina
Coordinates36.00375, -78.88152
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.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length137 ft (41.7 m)
Longest span48 ft (14.6 m)
Deck width62 ft (19 m)
Roadway width52 ft (15.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,500 (2021)
Projected traffic29,000 by 2040
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
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 SR1670 over Norfolk & Western R.R. built?

It was built in 1985, making it 40 years old in 2025.

What condition is SR1670 over Norfolk & Western R.R. 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 SR1670 over Norfolk & Western R.R. carry?

About 14,500 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is SR1670 over Norfolk & Western R.R.?

The structure is 137 ft (41.7 m) long with a longest span of 48 ft (14.6 m) and a deck 62 ft wide.

Who owns SR1670 over Norfolk & Western R.R.?

It is owned by the State Highway Agency.