US Bridges

Nfa 979 (sa 1109) over Sycamore Creek

PoorPosted for load

Cheatham County, Tennessee · 1.5 M. Ne. SR12. · Structure no. 11S61500001

Built
1949
76 years old
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
170 ft
4 main spans
Daily traffic
577
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 979 (sa 1109) over Sycamore Creek is a prestressed concrete stringer/multi-beam or girder carrying Nfa 979 (sa 1109) over Sycamore Creek in Cheatham County, Tennessee. It was built in 1949, so it is 76 years old, older than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 577 vehicles a day, roughly 3% of them trucks, projected to reach 923 by 2042. The structure is 170 ft (51.8 m) long and 29 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesNfa 979 (sa 1109)
CrossesSycamore Creek
Location1.5 M. Ne. SR12.
RouteCounty Highway 979
Coordinates36.3241, -87.09309
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be 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 alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating39.7 US tons
Inventory rating26.8 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length170 ft (51.8 m)
Longest span39 ft (11.9 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic577 (2021)
Projected traffic923 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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$271,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 979 (sa 1109) over Sycamore Creek built?

It was built in 1949, making it 76 years old in 2025.

What condition is Nfa 979 (sa 1109) over Sycamore Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.

How much traffic does Nfa 979 (sa 1109) over Sycamore Creek carry?

About 577 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 979 (sa 1109) over Sycamore Creek?

The structure is 170 ft (51.8 m) long with a longest span of 39 ft (11.9 m) and a deck 29 ft wide.

Who owns Nfa 979 (sa 1109) over Sycamore Creek?

It is owned by the County Highway Agency.