US Bridges

S.W. Bypass Sbl over SR 421 (I-516)

Good

Chatham County, Georgia · 1 MI W of Savannah · Structure no. 000000005101780

Built
1995
30 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
331 ft
4 main spans
Daily traffic
7,010
2024 count
Owner
State
State Highway Agency

About this bridge

S.W. Bypass Sbl over SR 421 (I-516) is a prestressed concrete stringer/multi-beam or girder carrying S.W. Bypass Sbl over SR 421 (I-516) in Chatham County, Georgia. It was built in 1995, so it is 30 years old, younger than the Georgia average of 47.5 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 7,010 vehicles a day, roughly 1% of them trucks, projected to reach 33,218 by 2031. The structure is 331 ft (100.9 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesS.W. Bypass Sbl
CrossesSR 421 (I-516)
Location1 MI W of Savannah
RouteCounty Highway 975
StateGeorgia
Coordinates32.04203, -81.14653
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.9 US tons
Inventory rating34.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length331 ft (100.9 m)
Longest span110 ft (33.5 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,010 (2024)
Projected traffic33,218 by 2031
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$1.9 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was S.W. Bypass Sbl over SR 421 (I-516) built?

It was built in 1995, making it 30 years old in 2025.

What condition is S.W. Bypass Sbl over SR 421 (I-516) 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 May 2024.

How much traffic does S.W. Bypass Sbl over SR 421 (I-516) carry?

About 7,010 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is S.W. Bypass Sbl over SR 421 (I-516)?

The structure is 331 ft (100.9 m) long with a longest span of 110 ft (33.5 m) and a deck 41 ft wide.

Who owns S.W. Bypass Sbl over SR 421 (I-516)?

It is owned by the State Highway Agency.