US Bridges

SR 421R B- I-516R over M-4034 Lathrop Ave.

Good

Chatham County, Georgia · In Savannah City Limits · Structure no. 000000005100370

Built
1972
53 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
135 ft
3 main spans
Daily traffic
7,230
2024 count
Owner
State
State Highway Agency

About this bridge

SR 421R B- I-516R over M-4034 Lathrop Ave. is a steel stringer/multi-beam or girder carrying SR 421R B- I-516R over M-4034 Lathrop Ave. in Chatham County, Georgia. It was built in 1972, so it is 53 years old, older 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 7,230 vehicles a day, roughly 1% of them trucks, projected to reach 9,075 by 2031. The structure is 135 ft (41.1 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR 421R B- I-516R
CrossesM-4034 Lathrop Ave.
LocationIn Savannah City Limits
RouteInterstate 516
CountyChatham County
StateGeorgia
Coordinates32.09206, -81.12859
Functional classUrban Local

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 inspectionSeptember 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 spans3
Design loadHS 20 + Mod
Structure length135 ft (41.1 m)
Longest span73 ft (22.3 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,230 (2024)
Projected traffic9,075 by 2031
Trucks1%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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$575,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 421R B- I-516R over M-4034 Lathrop Ave. built?

It was built in 1972, making it 53 years old in 2025.

What condition is SR 421R B- I-516R over M-4034 Lathrop Ave. 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 September 2024.

How much traffic does SR 421R B- I-516R over M-4034 Lathrop Ave. carry?

About 7,230 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is SR 421R B- I-516R over M-4034 Lathrop Ave.?

The structure is 135 ft (41.1 m) long with a longest span of 73 ft (22.3 m) and a deck 31 ft wide.

Who owns SR 421R B- I-516R over M-4034 Lathrop Ave.?

It is owned by the State Highway Agency.