US Bridges

Nfa A815 over Spillway for Luther Lake

Good

Dickson County, Tennessee · West Lake DR in Dickson · Structure no. 220A8150001

Built
1990
35 years old
Condition
Good
inspected June 2024
Type
Culvert
Concrete Continuous
Length
37 ft
2 main spans
Daily traffic
450
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nfa A815 over Spillway for Luther Lake is a concrete continuous culvert carrying Nfa A815 over Spillway for Luther Lake in Dickson County, Tennessee. It was built in 1990, so it is 35 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 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 450 vehicles a day, roughly 1% of them trucks, projected to reach 720 by 2040. The structure is 37 ft (11.3 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesNfa A815
CrossesSpillway for Luther Lake
LocationWest Lake DR in Dickson
RouteCity Street 815
Coordinates36.08097, -87.36649
Functional classUrban Local

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.
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length37 ft (11.3 m)
Longest span11 ft (3.4 m)
Deck width36 ft (10.9 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic450 (2020)
Projected traffic720 by 2040
Trucks1%
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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A815 over Spillway for Luther Lake built?

It was built in 1990, making it 35 years old in 2025.

What condition is Nfa A815 over Spillway for Luther Lake 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 Nfa A815 over Spillway for Luther Lake carry?

About 450 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is Nfa A815 over Spillway for Luther Lake?

The structure is 37 ft (11.3 m) long with a longest span of 11 ft (3.4 m) and a deck 36 ft wide.

Who owns Nfa A815 over Spillway for Luther Lake?

It is owned by the City or Municipal Highway Agency.