US Bridges

SR 404P-US 17 over Back River

Good

Chatham County, Georgia · 1 MI N of Savannah · Structure no. 000000005150960

Built
2015
10 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
3,290 ft
47 main spans
Daily traffic
20,000
2024 count
Owner
State
State Highway Agency

About this bridge

SR 404P-US 17 over Back River is a concrete stringer/multi-beam or girder carrying SR 404P-US 17 over Back River in Chatham County, Georgia. It was built in 2015, so it is 10 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 20,000 vehicles a day, roughly 1% of them trucks, projected to reach 20,910 by 2032. The structure is 3,290 ft (1,002.8 m) long and 43 ft wide. If it were closed, the detour would be 13 mi (21 km).

CarriesSR 404P-US 17
CrossesBack River
Location1 MI N of Savannah
RouteState Highway 17
StateGeorgia
Coordinates32.10157, -81.08879
Functional classRural Principal Arterial - Other

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating85 US tons
Inventory rating44 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans47
Design loadHS 20 + Mod
Structure length3,290 ft (1,002.8 m)
Longest span70 ft (21.3 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,000 (2024)
Projected traffic20,910 by 2032
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$438.2 million
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 404P-US 17 over Back River built?

It was built in 2015, making it 10 years old in 2025.

What condition is SR 404P-US 17 over Back River 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 404P-US 17 over Back River carry?

About 20,000 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is SR 404P-US 17 over Back River?

The structure is 3,290 ft (1,002.8 m) long with a longest span of 70 ft (21.3 m) and a deck 43 ft wide.

Who owns SR 404P-US 17 over Back River?

It is owned by the State Highway Agency.