US Bridges

US 231 MP 173.305 over Knights Mill Creek

Good

Pike County, Alabama · 1.8 Mi. E. of Troy · Structure no. 010548

Built
1971
54 years old
Condition
Good
inspected September 2023
Type
Culvert
Concrete
Length
53 ft
5 main spans
Daily traffic
18,360
2013 count
Owner
State
State Highway Agency

About this bridge

US 231 MP 173.305 over Knights Mill Creek is a concrete culvert carrying US 231 MP 173.305 over Knights Mill Creek in Pike County, Alabama. It was built in 1971, so it is 54 years old, older than the Alabama average of 51.1 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 18,360 vehicles a day, roughly 17% of them trucks, projected to reach 23,913 by 2033. The structure is 53 ft (16.2 m) long. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesUS 231 MP 173.305
CrossesKnights Mill Creek
Location1.8 Mi. E. of Troy
RouteU.S. Route 231
CountyPike County
StateAlabama
Coordinates31.77078, -85.91705
Functional classRural Principal Arterial - Other

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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98 US tons
Inventory rating98 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans5
Design loadHS 20
Structure length53 ft (16.2 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,360 (2013)
Projected traffic23,913 by 2033
Trucks17%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$2.7 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 231 MP 173.305 over Knights Mill Creek built?

It was built in 1971, making it 54 years old in 2025.

What condition is US 231 MP 173.305 over Knights 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 US 231 MP 173.305 over Knights Mill Creek carry?

About 18,360 vehicles per day (2013 count), of which roughly 17% are trucks.

How long is US 231 MP 173.305 over Knights Mill Creek?

The structure is 53 ft (16.2 m) long with a longest span of 10 ft (3 m).

Who owns US 231 MP 173.305 over Knights Mill Creek?

It is owned by the State Highway Agency.