US Bridges

I65 over Williamson Rd. B21

Good

Sumner County, Tennessee · 3.5 M N Davidson CO Line · Structure no. 83I00650008

Built
1972
53 years old
Condition
Good
inspected August 2024
Type
Tee Beam
Concrete Continuous
Length
119 ft
3 main spans
Daily traffic
56,822
2021 count
Owner
State
State Highway Agency

About this bridge

I65 over Williamson Rd. B21 is a concrete continuous tee beam carrying I65 over Williamson Rd. B21 in Sumner County, Tennessee. It was built in 1972, so it is 53 years old, older 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 56,822 vehicles a day, roughly 7% of them trucks, projected to reach 90,915 by 2042. The structure is 119 ft (36.3 m) long and 44 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesI65
CrossesWilliamson Rd. B21
Location3.5 M N Davidson CO Line
RouteInterstate I0065
Coordinates36.38142, -86.71475
Functional classUrban Principal Arterial - Interstate

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.8 US tons
Inventory rating32.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length119 ft (36.3 m)
Longest span57 ft (17.4 m)
Deck width44 ft (13.4 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56,822 (2021)
Projected traffic90,915 by 2042
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed19.9 mi (32 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$188,000 (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I65 over Williamson Rd. B21 built?

It was built in 1972, making it 53 years old in 2025.

What condition is I65 over Williamson Rd. B21 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 August 2024.

How much traffic does I65 over Williamson Rd. B21 carry?

About 56,822 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is I65 over Williamson Rd. B21?

The structure is 119 ft (36.3 m) long with a longest span of 57 ft (17.4 m) and a deck 44 ft wide.

Who owns I65 over Williamson Rd. B21?

It is owned by the State Highway Agency.