US Bridges

FAU 3580 over Shallowford RD / I-75

Fair

Hamilton County, Tennessee · 1.5 Mi.Ne.Of SR 153 · Structure no. 33I00750049

Built
1959
66 years old, rebuilt 1989
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
243 ft
4 main spans
Daily traffic
25,154
2021 count
Owner
State
State Highway Agency

About this bridge

FAU 3580 over Shallowford RD / I-75 is a prestressed concrete continuous box beam or girders - single or spread carrying FAU 3580 over Shallowford RD / I-75 in Hamilton County, Tennessee. It was built in 1959 and reconstructed in 1989, so it is 66 years old, older than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 25,154 vehicles a day, roughly 6% of them trucks, projected to reach 38,704 by 2040. The structure is 243 ft (74 m) long and 88 ft wide.

Location

Open in Google Maps
CarriesFAU 3580
CrossesShallowford RD / I-75
Location1.5 Mi.Ne.Of SR 153
RouteCity Street 3580
CountyHamilton County
StateTennessee
Coordinates35.04258, -85.15638
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.6 US tons
Inventory rating30 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length243 ft (74 m)
Longest span69 ft (21 m)
Deck width88 ft (26.8 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,154 (2021)
Projected traffic38,704 by 2040
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was FAU 3580 over Shallowford RD / I-75 built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1989.

What condition is FAU 3580 over Shallowford RD / I-75 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 FAU 3580 over Shallowford RD / I-75 carry?

About 25,154 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is FAU 3580 over Shallowford RD / I-75?

The structure is 243 ft (74 m) long with a longest span of 69 ft (21 m) and a deck 88 ft wide.

Who owns FAU 3580 over Shallowford RD / I-75?

It is owned by the State Highway Agency.