US Bridges

Nfa C171 over Rock Springs Branch

Good

Rutherford County, Tennessee · 4.1 MI NE JCT I24&SR266 · Structure no. 750C1710001

Built
2000
25 years old
Condition
Good
inspected September 2024
Type
Culvert
Concrete Continuous
Length
49 ft
3 main spans
Daily traffic
210
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nfa C171 over Rock Springs Branch is a concrete continuous culvert carrying Nfa C171 over Rock Springs Branch in Rutherford County, Tennessee. It was built in 2000, so it is 25 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 210 vehicles a day, roughly 1% of them trucks, projected to reach 336 by 2041. The structure is 49 ft (14.9 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesNfa C171
CrossesRock Springs Branch
Location4.1 MI NE JCT I24&SR266
RouteCounty Highway 0C171
Coordinates35.97787, -86.55263
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length49 ft (14.9 m)
Longest span15 ft (4.5 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic210 (2020)
Projected traffic336 by 2041
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 C171 over Rock Springs Branch built?

It was built in 2000, making it 25 years old in 2025.

What condition is Nfa C171 over Rock Springs 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 September 2024.

How much traffic does Nfa C171 over Rock Springs Branch carry?

About 210 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is Nfa C171 over Rock Springs Branch?

The structure is 49 ft (14.9 m) long with a longest span of 15 ft (4.5 m) and a deck 34 ft wide.

Who owns Nfa C171 over Rock Springs Branch?

It is owned by the City or Municipal Highway Agency.