US Bridges

Nfa 1791 (sa 4204) over Ross Branch

Fair

Houston County, Tennessee · 1.5 M S of Erin · Structure no. 42017910013

Built
1965
60 years old
Condition
Fair
inspected January 2024
Type
Culvert
Concrete Continuous
Length
29 ft
2 main spans
Daily traffic
523
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1791 (sa 4204) over Ross Branch is a concrete continuous culvert carrying Nfa 1791 (sa 4204) over Ross Branch in Houston County, Tennessee. It was built in 1965, so it is 60 years old, older 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 523 vehicles a day, roughly 3% of them trucks, projected to reach 880 by 2042. The structure is 29 ft (8.8 m) long and 26 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesNfa 1791 (sa 4204)
CrossesRoss Branch
Location1.5 M S of Erin
RouteCounty Highway 1791
CountyHouston County
StateTennessee
Coordinates36.29923, -87.6834
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2024
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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating64.6 US tons
Inventory rating39.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length29 ft (8.8 m)
Longest span14 ft (4.3 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic523 (2021)
Projected traffic880 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 1791 (sa 4204) over Ross Branch built?

It was built in 1965, making it 60 years old in 2025.

What condition is Nfa 1791 (sa 4204) over Ross Branch 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 January 2024.

How much traffic does Nfa 1791 (sa 4204) over Ross Branch carry?

About 523 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 1791 (sa 4204) over Ross Branch?

The structure is 29 ft (8.8 m) long with a longest span of 14 ft (4.3 m) and a deck 26 ft wide.

Who owns Nfa 1791 (sa 4204) over Ross Branch?

It is owned by the County Highway Agency.