US Bridges

Nfa 1175 (sa 3724) over Holston River

PoorPosted for load

Hawkins County, Tennessee · Just S of SR346-US11W JCT · Structure no. 37S23670007

Built
1964
61 years old
Condition
Poor
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
874 ft
1 main span
Daily traffic
4,225
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1175 (sa 3724) over Holston River is a steel stringer/multi-beam or girder carrying Nfa 1175 (sa 3724) over Holston River in Hawkins County, Tennessee. It was built in 1964, so it is 61 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 4,225 vehicles a day, roughly 3% of them trucks, projected to reach 6,843 by 2041. The structure is 874 ft (266.4 m) long and 29 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesNfa 1175 (sa 3724)
CrossesHolston River
LocationJust S of SR346-US11W JCT
RouteCounty Highway 1175
Coordinates36.51558, -82.72417
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating13.6 US tons
Inventory rating10.4 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+7 approach)
Design loadH 15
Structure length874 ft (266.4 m)
Longest span211 ft (64.3 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,225 (2021)
Projected traffic6,843 by 2041
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$14.3 million (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 1175 (sa 3724) over Holston River built?

It was built in 1964, making it 61 years old in 2025.

What condition is Nfa 1175 (sa 3724) over Holston River 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 May 2023.

How much traffic does Nfa 1175 (sa 3724) over Holston River carry?

About 4,225 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 1175 (sa 3724) over Holston River?

The structure is 874 ft (266.4 m) long with a longest span of 211 ft (64.3 m) and a deck 29 ft wide.

Who owns Nfa 1175 (sa 3724) over Holston River?

It is owned by the County Highway Agency.