US Bridges

Nfa B998 over Branch

Good

Williamson County, Tennessee · On Mallory Station Road · Structure no. 940B9980001

Built
2000
25 years old
Condition
Good
inspected June 2023
Type
Culvert
Concrete Continuous
Length
54 ft
3 main spans
Daily traffic
1,370
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nfa B998 over Branch is a concrete continuous culvert carrying Nfa B998 over Branch in Williamson County, Tennessee. It was built in 2000, so it is 25 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 1,370 vehicles a day, roughly 1% of them trucks, projected to reach 2,192 by 2041. The structure is 54 ft (16.5 m) long. If it were closed, the detour would be 3.1 mi (5 km).

CarriesNfa B998
CrossesBranch
LocationOn Mallory Station Road
RouteCity Street 998
Coordinates35.9523, -86.81947
Functional classUrban Local

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length54 ft (16.5 m)
Longest span18 ft (5.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,370 (2020)
Projected traffic2,192 by 2041
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa B998 over Branch built?

It was built in 2000, making it 25 years old in 2025.

What condition is Nfa B998 over 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 June 2023.

How much traffic does Nfa B998 over Branch carry?

About 1,370 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is Nfa B998 over Branch?

The structure is 54 ft (16.5 m) long with a longest span of 18 ft (5.5 m).

Who owns Nfa B998 over Branch?

It is owned by the City or Municipal Highway Agency.