US Bridges

SR3998 over I485

Fair

Mecklenburg County, North Carolina · 1.1 Mi. N. Jct. NC51 · Structure no. 000000001190559

Built
1990
35 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
305 ft
4 main spans
Daily traffic
18,000
2022 count
Owner
State
State Highway Agency

About this bridge

SR3998 over I485 is a steel stringer/multi-beam or girder carrying SR3998 over I485 in Mecklenburg County, North Carolina. It was built in 1990, so it is 35 years old, younger 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 18,000 vehicles a day, roughly 6% of them trucks, projected to reach 36,000 by 2040. The structure is 305 ft (92.9 m) long and 94 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR3998
CrossesI485
Location1.1 Mi. N. Jct. NC51
RouteState Highway 3998
CountyMecklenburg County
StateNorth Carolina
Coordinates35.1017, -80.88081
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 inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.9 US tons
Inventory rating39.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length305 ft (92.9 m)
Longest span93 ft (28.3 m)
Deck width94 ft (28.8 m)
Roadway width91 ft (27.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,000 (2022)
Projected traffic36,000 by 2040
Trucks6%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 SR3998 over I485 built?

It was built in 1990, making it 35 years old in 2025.

What condition is SR3998 over I485 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 2024.

How much traffic does SR3998 over I485 carry?

About 18,000 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is SR3998 over I485?

The structure is 305 ft (92.9 m) long with a longest span of 93 ft (28.3 m) and a deck 94 ft wide.

Who owns SR3998 over I485?

It is owned by the State Highway Agency.