US Bridges

Nfa 4690 over Gann Branch

Good

Sevier County, Tennessee · 1.0 M N of I40 at Knox C · Structure no. 78046900003

Built
2018
7 years old
Condition
Good
inspected July 2023
Type
Culvert
Steel
Length
25 ft
1 main span
Daily traffic
5,587
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 4690 over Gann Branch is a steel culvert carrying Nfa 4690 over Gann Branch in Sevier County, Tennessee. It was built in 2018, so it is 7 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,587 vehicles a day, roughly 3% of them trucks, projected to reach 8,755 by 2041. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesNfa 4690
CrossesGann Branch
Location1.0 M N of I40 at Knox C
RouteCounty Highway 4690
CountySevier County
StateTennessee
Coordinates35.99472, -83.61324
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 protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHL 93
Structure length25 ft (7.6 m)
Longest span25 ft (7.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,587 (2021)
Projected traffic8,755 by 2041
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$2,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 4690 over Gann Branch built?

It was built in 2018, making it 7 years old in 2025.

What condition is Nfa 4690 over Gann 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 July 2023.

How much traffic does Nfa 4690 over Gann Branch carry?

About 5,587 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 4690 over Gann Branch?

The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.6 m).

Who owns Nfa 4690 over Gann Branch?

It is owned by the County Highway Agency.