US Bridges

FAU 3975 over Cobb Creek

Good

Washington County, Tennessee · In Johnson City · Structure no. 90039740003

Built
1965
60 years old
Condition
Good
inspected June 2024
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
8,632
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

FAU 3975 over Cobb Creek is a concrete continuous culvert carrying FAU 3975 over Cobb Creek in Washington 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 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 8,632 vehicles a day, roughly 3% of them trucks, projected to reach 13,811 by 2042. The structure is 26 ft (7.9 m) long and 64 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesFAU 3975
CrossesCobb Creek
LocationIn Johnson City
RouteCity Street 3975
Coordinates36.34263, -82.36697
Functional classUrban Collector

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width64 ft (19.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,632 (2021)
Projected traffic13,811 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 FAU 3975 over Cobb Creek built?

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

What condition is FAU 3975 over Cobb Creek 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 June 2024.

How much traffic does FAU 3975 over Cobb Creek carry?

About 8,632 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is FAU 3975 over Cobb Creek?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m) and a deck 64 ft wide.

Who owns FAU 3975 over Cobb Creek?

It is owned by the City or Municipal Highway Agency.