US Bridges

Nfa 870 (sa 5705) over Allen Creek

Fair

Madison County, Tennessee · 2.2 MI SW JCT SR5&SR197 · Structure no. 57S81880019

Built
1984
41 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
108 ft
3 main spans
Daily traffic
901
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 870 (sa 5705) over Allen Creek is a prestressed concrete stringer/multi-beam or girder carrying Nfa 870 (sa 5705) over Allen Creek in Madison County, Tennessee. It was built in 1984, so it is 41 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 901 vehicles a day, roughly 3% of them trucks, projected to reach 1,552 by 2041. The structure is 108 ft (32.9 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa 870 (sa 5705)
CrossesAllen Creek
Location2.2 MI SW JCT SR5&SR197
RouteCounty Highway 870
CountyMadison County
StateTennessee
Coordinates35.47061, -88.75108
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length108 ft (32.9 m)
Longest span36 ft (11 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic901 (2021)
Projected traffic1,552 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 870 (sa 5705) over Allen Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is Nfa 870 (sa 5705) over Allen 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 May 2023.

How much traffic does Nfa 870 (sa 5705) over Allen Creek carry?

About 901 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 870 (sa 5705) over Allen Creek?

The structure is 108 ft (32.9 m) long with a longest span of 36 ft (11 m) and a deck 28 ft wide.

Who owns Nfa 870 (sa 5705) over Allen Creek?

It is owned by the County Highway Agency.