US Bridges

Nfa B366 over Spencer Creek

Good

Williamson County, Tennessee · 0.2M NW of Cool Springs B · Structure no. 940B3660001

Built
1980
45 years old
Condition
Good
inspected August 2023
Type
Culvert
Concrete
Length
64 ft
4 main spans
Daily traffic
3,000
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nfa B366 over Spencer Creek is a concrete culvert carrying Nfa B366 over Spencer Creek in Williamson County, Tennessee. It was built in 1980, so it is 45 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 3,000 vehicles a day, roughly 2% of them trucks, projected to reach 4,800 by 2042. The structure is 64 ft (19.5 m) long and 57 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesNfa B366
CrossesSpencer Creek
Location0.2M NW of Cool Springs B
RouteCity Street 366
CountyWilliamson County
StateTennessee
Coordinates35.94606, -86.83059
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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length64 ft (19.5 m)
Longest span15 ft (4.6 m)
Deck width57 ft (17.5 m)
Roadway width53 ft (16.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2022)
Projected traffic4,800 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 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 B366 over Spencer Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is Nfa B366 over Spencer Creek 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 2023.

How much traffic does Nfa B366 over Spencer Creek carry?

About 3,000 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Nfa B366 over Spencer Creek?

The structure is 64 ft (19.5 m) long with a longest span of 15 ft (4.6 m) and a deck 57 ft wide.

Who owns Nfa B366 over Spencer Creek?

It is owned by the City or Municipal Highway Agency.