US Bridges

SR3977 over Swift Creek

Good

Wake County, North Carolina · .7 Mi.W.Of SR1300 · Structure no. 000000001830677

Built
1988
37 years old, rebuilt 1993
Condition
Good
inspected February 2022
Type
Culvert
Steel
Length
29 ft
2 main spans
Daily traffic
23,500
2019 count
Owner
State
State Highway Agency

About this bridge

SR3977 over Swift Creek is a steel culvert carrying SR3977 over Swift Creek in Wake County, North Carolina. It was built in 1988 and reconstructed in 1993, so it is 37 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 23,500 vehicles a day, roughly 6% of them trucks, projected to reach 47,000 by 2040. The structure is 29 ft (8.8 m) long. If it were closed, the detour would be 0.6 mi (1 km).

CarriesSR3977
CrossesSwift Creek
Location.7 Mi.W.Of SR1300
RouteState Highway 3977
Coordinates35.75607, -78.79511
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length29 ft (8.8 m)
Longest span12 ft (3.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,500 (2019)
Projected traffic47,000 by 2040
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR3977 over Swift Creek built?

It was built in 1988, making it 37 years old in 2025. It was reconstructed in 1993.

What condition is SR3977 over Swift Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2022.

How much traffic does SR3977 over Swift Creek carry?

About 23,500 vehicles per day (2019 count), of which roughly 6% are trucks.

How long is SR3977 over Swift Creek?

The structure is 29 ft (8.8 m) long with a longest span of 12 ft (3.6 m).

Who owns SR3977 over Swift Creek?

It is owned by the State Highway Agency.