US Bridges

Nfa A685 over Mill Creek

Good

Hickman County, Tennessee · Brown RD in Hickman CO · Structure no. 410A6850001

Built
1997
28 years old
Condition
Good
inspected September 2023
Type
Culvert
Concrete Continuous
Length
39 ft
3 main spans
Daily traffic
10
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A685 over Mill Creek is a concrete continuous culvert carrying Nfa A685 over Mill Creek in Hickman County, Tennessee. It was built in 1997, so it is 28 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 10 vehicles a day, roughly 1% of them trucks, projected to reach 16 by 2041. The structure is 39 ft (11.9 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesNfa A685
CrossesMill Creek
LocationBrown RD in Hickman CO
RouteCounty Highway 685
CountyHickman County
StateTennessee
Coordinates35.8917, -87.34589
Functional classRural 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 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.7 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length39 ft (11.9 m)
Longest span12 ft (3.7 m)
Deck width28 ft (8.4 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2020)
Projected traffic16 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

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 A685 over Mill Creek built?

It was built in 1997, making it 28 years old in 2025.

What condition is Nfa A685 over Mill 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 September 2023.

How much traffic does Nfa A685 over Mill Creek carry?

About 10 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is Nfa A685 over Mill Creek?

The structure is 39 ft (11.9 m) long with a longest span of 12 ft (3.7 m) and a deck 28 ft wide.

Who owns Nfa A685 over Mill Creek?

It is owned by the County Highway Agency.