US Bridges

Nfa 996 (sa 9409) over Alexander Branch

Good

Williamson County, Tennessee · 2.7 MI NE JCT SR106&SR247 · Structure no. 94F00360001

Built
1971
54 years old
Condition
Good
inspected April 2023
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
1,706
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 996 (sa 9409) over Alexander Branch is a concrete continuous culvert carrying Nfa 996 (sa 9409) over Alexander Branch in Williamson County, Tennessee. It was built in 1971, so it is 54 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 1,706 vehicles a day, roughly 3% of them trucks, projected to reach 2,944 by 2041. The structure is 22 ft (6.7 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesNfa 996 (sa 9409)
CrossesAlexander Branch
Location2.7 MI NE JCT SR106&SR247
RouteCounty Highway 996
CountyWilliamson County
StateTennessee
Coordinates35.77157, -86.80576
Functional classRural Minor Collector

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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.5 US tons
Inventory rating24.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,706 (2021)
Projected traffic2,944 by 2041
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$104,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 996 (sa 9409) over Alexander Branch built?

It was built in 1971, making it 54 years old in 2025.

What condition is Nfa 996 (sa 9409) over Alexander 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 April 2023.

How much traffic does Nfa 996 (sa 9409) over Alexander Branch carry?

About 1,706 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 996 (sa 9409) over Alexander Branch?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m) and a deck 26 ft wide.

Who owns Nfa 996 (sa 9409) over Alexander Branch?

It is owned by the County Highway Agency.