US Bridges

SR1820 over I74 US311

Fair

Guilford County, North Carolina · 1.26 Mi. E. Jct. SR1003 · Structure no. 000000000810080

Built
1979
46 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
257 ft
2 main spans
Daily traffic
6,800
2021 count
Owner
State
State Highway Agency

About this bridge

SR1820 over I74 US311 is a steel stringer/multi-beam or girder carrying SR1820 over I74 US311 in Guilford County, North Carolina. It was built in 1979, so it is 46 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 6,800 vehicles a day, roughly 6% of them trucks, projected to reach 13,600 by 2040. The structure is 257 ft (78.3 m) long and 47 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesSR1820
CrossesI74 US311
Location1.26 Mi. E. Jct. SR1003
RouteState Highway 1820
CountyGuilford County
StateNorth Carolina
Coordinates36.01685, -80.04294
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating78.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length257 ft (78.3 m)
Longest span136 ft (41.4 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,800 (2021)
Projected traffic13,600 by 2040
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed2.5 mi (4 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 SR1820 over I74 US311 built?

It was built in 1979, making it 46 years old in 2025.

What condition is SR1820 over I74 US311 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 SR1820 over I74 US311 carry?

About 6,800 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is SR1820 over I74 US311?

The structure is 257 ft (78.3 m) long with a longest span of 136 ft (41.4 m) and a deck 47 ft wide.

Who owns SR1820 over I74 US311?

It is owned by the State Highway Agency.