US Bridges

Nfa 1137 (sa 8915) over Mountain Creek

Fair

Warren County, Tennessee · 3 MI East of SR 56 · Structure no. 89021830001

Built
1978
47 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
170 ft
3 main spans
Daily traffic
124
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1137 (sa 8915) over Mountain Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying Nfa 1137 (sa 8915) over Mountain Creek in Warren County, Tennessee. It was built in 1978, so it is 47 years old, younger than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 124 vehicles a day, roughly 4% of them trucks, projected to reach 210 by 2042. The structure is 170 ft (51.8 m) long and 26 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

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CarriesNfa 1137 (sa 8915)
CrossesMountain Creek
Location3 MI East of SR 56
RouteCounty Highway 1137
CountyWarren County
StateTennessee
Coordinates35.79093, -85.75235
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating69.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans3
Design loadH 15
Structure length170 ft (51.8 m)
Longest span58 ft (17.8 m)
Deck width26 ft (7.9 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic124 (2021)
Projected traffic210 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 1137 (sa 8915) over Mountain Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is Nfa 1137 (sa 8915) over Mountain Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.

How much traffic does Nfa 1137 (sa 8915) over Mountain Creek carry?

About 124 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is Nfa 1137 (sa 8915) over Mountain Creek?

The structure is 170 ft (51.8 m) long with a longest span of 58 ft (17.8 m) and a deck 26 ft wide.

Who owns Nfa 1137 (sa 8915) over Mountain Creek?

It is owned by the County Highway Agency.