US Bridges

I-16 (wbl) over SR 421 (I-516)

Fair

Chatham County, Georgia · In Savannah City Limits · Structure no. 000000005100930

Built
1966
59 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
225 ft
4 main spans
Daily traffic
39,900
2024 count
Owner
State
State Highway Agency

About this bridge

I-16 (wbl) over SR 421 (I-516) is a steel continuous stringer/multi-beam or girder carrying I-16 (wbl) over SR 421 (I-516) in Chatham County, Georgia. It was built in 1966, so it is 59 years old, older than the Georgia average of 47.5 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 39,900 vehicles a day, roughly 1% of them trucks, projected to reach 69,135 by 2031. The structure is 225 ft (68.6 m) long and 58 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-16 (wbl)
CrossesSR 421 (I-516)
LocationIn Savannah City Limits
RouteInterstate 16
CountyChatham County
StateGeorgia
Coordinates32.07216, -81.13472
Functional classUrban Principal Arterial - Interstate

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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length225 ft (68.6 m)
Longest span80 ft (24.4 m)
Deck width58 ft (17.8 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic39,900 (2024)
Projected traffic69,135 by 2031
Trucks1%
Lanes on structure4
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-16 (wbl) over SR 421 (I-516) built?

It was built in 1966, making it 59 years old in 2025.

What condition is I-16 (wbl) over SR 421 (I-516) 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 August 2024.

How much traffic does I-16 (wbl) over SR 421 (I-516) carry?

About 39,900 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is I-16 (wbl) over SR 421 (I-516)?

The structure is 225 ft (68.6 m) long with a longest span of 80 ft (24.4 m) and a deck 58 ft wide.

Who owns I-16 (wbl) over SR 421 (I-516)?

It is owned by the State Highway Agency.