US Bridges

SR1175 over US421

Fair

Forsyth County, North Carolina · 1.2 Mi. N. Jct. SR1001 · Structure no. 000000000670174

Built
1958
67 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
277 ft
4 main spans
Daily traffic
900
2019 count
Owner
State
State Highway Agency

About this bridge

SR1175 over US421 is a steel stringer/multi-beam or girder carrying SR1175 over US421 in Forsyth County, North Carolina. It was built in 1958, so it is 67 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 5 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 900 vehicles a day, roughly 7% of them trucks, projected to reach 1,800 by 2040. The structure is 277 ft (84.4 m) long and 26 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSR1175
CrossesUS421
Location1.2 Mi. N. Jct. SR1001
RouteState Highway 1175
CountyForsyth County
StateNorth Carolina
Coordinates36.09561, -80.44903
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length277 ft (84.4 m)
Longest span71 ft (21.6 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic900 (2019)
Projected traffic1,800 by 2040
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR1175 over US421 built?

It was built in 1958, making it 67 years old in 2025.

What condition is SR1175 over US421 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 September 2024.

How much traffic does SR1175 over US421 carry?

About 900 vehicles per day (2019 count), of which roughly 7% are trucks.

How long is SR1175 over US421?

The structure is 277 ft (84.4 m) long with a longest span of 71 ft (21.6 m) and a deck 26 ft wide.

Who owns SR1175 over US421?

It is owned by the State Highway Agency.