US Bridges

FAP 20 over Alley Branch

Good

Decatur County, Tennessee · 3.8 Mi.East of Parsons · Structure no. 20SR0200011

Built
1930
95 years old
Condition
Good
inspected December 2023
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
2,924
2021 count
Owner
State
State Highway Agency

About this bridge

FAP 20 over Alley Branch is a concrete continuous culvert carrying FAP 20 over Alley Branch in Decatur County, Tennessee. It was built in 1930, so it is 95 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 2,924 vehicles a day, roughly 10% of them trucks, projected to reach 4,678 by 2042. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 64 mi (103 km).

CarriesFAP 20
CrossesAlley Branch
Location3.8 Mi.East of Parsons
RouteState Highway 20
Coordinates35.63066, -88.04303
Functional classRural Principal Arterial - Other

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 inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,924 (2021)
Projected traffic4,678 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed64 mi (103 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 FAP 20 over Alley Branch built?

It was built in 1930, making it 95 years old in 2025.

What condition is FAP 20 over Alley 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 December 2023.

How much traffic does FAP 20 over Alley Branch carry?

About 2,924 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is FAP 20 over Alley Branch?

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

Who owns FAP 20 over Alley Branch?

It is owned by the State Highway Agency.