US Bridges

FAU 3566 over Inactive NS RR Spur

PoorPosted for load

Hamilton County, Tennessee · In Downtown Chattanooga · Structure no. 33L35660001

Built
1906
119 years old, rebuilt 1947
Condition
Poor
inspected February 2024
Type
Girder and Floorbeam System
Steel
Length
977 ft
1 main span
Daily traffic
2,659
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

FAU 3566 over Inactive NS RR Spur is a steel girder and floorbeam system carrying FAU 3566 over Inactive NS RR Spur in Hamilton County, Tennessee. It was built in 1906 and reconstructed in 1947, so it is 119 years old, older than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 2,659 vehicles a day, roughly 3% of them trucks, projected to reach 4,254 by 2042. The structure is 977 ft (297.8 m) long and 52 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesFAU 3566
CrossesInactive NS RR Spur
LocationIn Downtown Chattanooga
RouteCity Street 3566
Coordinates35.03952, -85.29823
Functional classUrban Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24.7 US tons
Inventory rating19.3 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length977 ft (297.8 m)
Longest span98 ft (29.8 m)
Deck width52 ft (15.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,659 (2021)
Projected traffic4,254 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was FAU 3566 over Inactive NS RR Spur built?

It was built in 1906, making it 119 years old in 2025. It was reconstructed in 1947.

What condition is FAU 3566 over Inactive NS RR Spur in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2024.

How much traffic does FAU 3566 over Inactive NS RR Spur carry?

About 2,659 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is FAU 3566 over Inactive NS RR Spur?

The structure is 977 ft (297.8 m) long with a longest span of 98 ft (29.8 m) and a deck 52 ft wide.

Who owns FAU 3566 over Inactive NS RR Spur?

It is owned by the City or Municipal Highway Agency.