US Bridges

County Road 7450 over Twentymile Creek

FairPosted for load

Prentiss County, Mississippi · Sec 2 T 6S R 6E B · Structure no. SA5900000000074

Built
1968
57 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
160 ft
1 main span
Daily traffic
300
2016 count
Owner
County
County Highway Agency

About this bridge

County Road 7450 over Twentymile Creek is a steel stringer/multi-beam or girder carrying County Road 7450 over Twentymile Creek in Prentiss County, Mississippi. It was built in 1968, so it is 57 years old, older than the Mississippi average of 38.9 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. Its operating status is: posted for load restriction.

It carries about 300 vehicles a day, roughly 8% of them trucks, projected to reach 450 by 2036. The structure is 160 ft (48.8 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCounty Road 7450
CrossesTwentymile Creek
LocationSec 2 T 6S R 6E B
RouteCounty Highway 259
CountyPrentiss County
StateMississippi
Coordinates34.5853, -88.6318
Functional classRural Local

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 inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusPosted for load 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41.3 US tons
Inventory rating24.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadH 15
Structure length160 ft (48.8 m)
Longest span80 ft (24.4 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2016)
Projected traffic450 by 2036
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$358,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 7450 over Twentymile Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is County Road 7450 over Twentymile Creek 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 January 2024.

How much traffic does County Road 7450 over Twentymile Creek carry?

About 300 vehicles per day (2016 count), of which roughly 8% are trucks.

How long is County Road 7450 over Twentymile Creek?

The structure is 160 ft (48.8 m) long with a longest span of 80 ft (24.4 m) and a deck 29 ft wide.

Who owns County Road 7450 over Twentymile Creek?

It is owned by the County Highway Agency.