US Bridges

FAU 4972 over Roberts Mill Branch

Good

Hamilton County, Tennessee · .5 MI West of SR 29 · Structure no. 330C1810001

Built
1988
37 years old
Condition
Good
inspected January 2025
Type
Culvert
Concrete Continuous
Length
33 ft
2 main spans
Daily traffic
2,849
2021 count
Owner
County
County Highway Agency

About this bridge

FAU 4972 over Roberts Mill Branch is a concrete continuous culvert carrying FAU 4972 over Roberts Mill Branch in Hamilton County, Tennessee. It was built in 1988, so it is 37 years old, younger than the Tennessee average of 47.4 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 2,849 vehicles a day, roughly 4% of them trucks, projected to reach 4,558 by 2042. The structure is 33 ft (10.2 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesFAU 4972
CrossesRoberts Mill Branch
Location.5 MI West of SR 29
RouteCounty Highway 4972
Coordinates35.19876, -85.2504
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length33 ft (10.2 m)
Longest span15 ft (4.6 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,849 (2021)
Projected traffic4,558 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FAU 4972 over Roberts Mill Branch built?

It was built in 1988, making it 37 years old in 2025.

What condition is FAU 4972 over Roberts Mill Branch 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 January 2025.

How much traffic does FAU 4972 over Roberts Mill Branch carry?

About 2,849 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is FAU 4972 over Roberts Mill Branch?

The structure is 33 ft (10.2 m) long with a longest span of 15 ft (4.6 m) and a deck 35 ft wide.

Who owns FAU 4972 over Roberts Mill Branch?

It is owned by the County Highway Agency.