US Bridges

Nfa 1515 (sa 4804) over Blue Bank Bayou

Fair

Lake County, Tennessee · 2 MI W of SR78 · Structure no. 48S81570001

Built
1965
60 years old
Condition
Fair
inspected May 2024
Type
Channel Beam
Concrete
Length
38 ft
2 main spans
Daily traffic
159
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1515 (sa 4804) over Blue Bank Bayou is a concrete channel beam carrying Nfa 1515 (sa 4804) over Blue Bank Bayou in Lake 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 6 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 159 vehicles a day, roughly 3% of them trucks, projected to reach 160 by 2040. The structure is 38 ft (11.6 m) long and 25 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa 1515 (sa 4804)
CrossesBlue Bank Bayou
Location2 MI W of SR78
RouteCounty Highway 1515
CountyLake County
StateTennessee
Coordinates36.3027, -89.50069
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating26.8 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadH 15
Structure length38 ft (11.6 m)
Longest span15 ft (4.5 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic159 (2021)
Projected traffic160 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 1515 (sa 4804) over Blue Bank Bayou built?

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

What condition is Nfa 1515 (sa 4804) over Blue Bank Bayou 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 May 2024.

How much traffic does Nfa 1515 (sa 4804) over Blue Bank Bayou carry?

About 159 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 1515 (sa 4804) over Blue Bank Bayou?

The structure is 38 ft (11.6 m) long with a longest span of 15 ft (4.5 m) and a deck 25 ft wide.

Who owns Nfa 1515 (sa 4804) over Blue Bank Bayou?

It is owned by the County Highway Agency.