US Bridges

SR 21 (nbl) over CSX Railroad

Fair

Chatham County, Georgia · 1 MI N of Port Wentworth · Structure no. 000000005100340

Built
1980
45 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
221 ft
3 main spans
Daily traffic
31,700
2024 count
Owner
State
State Highway Agency

About this bridge

SR 21 (nbl) over CSX Railroad is a prestressed concrete stringer/multi-beam or girder carrying SR 21 (nbl) over CSX Railroad in Chatham County, Georgia. It was built in 1980, so it is 45 years old, younger 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 31,700 vehicles a day, roughly 1% of them trucks, projected to reach 37,980 by 2031. The structure is 221 ft (67.4 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSR 21 (nbl)
CrossesCSX Railroad
Location1 MI N of Port Wentworth
RouteState Highway 21
CountyChatham County
StateGeorgia
Coordinates32.18348, -81.19052
Functional classUrban Other Principal 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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJuly 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 rating73 US tons
Inventory rating40.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length221 ft (67.4 m)
Longest span75 ft (22.9 m)
Deck width44 ft (13.3 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,700 (2024)
Projected traffic37,980 by 2031
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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$1.3 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 21 (nbl) over CSX Railroad built?

It was built in 1980, making it 45 years old in 2025.

What condition is SR 21 (nbl) over CSX Railroad 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 July 2024.

How much traffic does SR 21 (nbl) over CSX Railroad carry?

About 31,700 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is SR 21 (nbl) over CSX Railroad?

The structure is 221 ft (67.4 m) long with a longest span of 75 ft (22.9 m) and a deck 44 ft wide.

Who owns SR 21 (nbl) over CSX Railroad?

It is owned by the State Highway Agency.