US Bridges

CO RD 550 over Mill Bayou

FairPosted for load

Leflore County, Mississippi · Sec 18 T22N R 1E B · Structure no. SA4200000000095

Built
1955
70 years old
Condition
Fair
inspected March 2024
Type
Slab
Concrete
Length
171 ft
9 main spans
Daily traffic
140
2015 count
Owner
County
County Highway Agency

About this bridge

CO RD 550 over Mill Bayou is a concrete slab carrying CO RD 550 over Mill Bayou in Leflore County, Mississippi. It was built in 1955, so it is 70 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 5 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 140 vehicles a day, roughly 8% of them trucks, projected to reach 165 by 2035. The structure is 171 ft (52.1 m) long and 25 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesCO RD 550
CrossesMill Bayou
LocationSec 18 T22N R 1E B
RouteCounty Highway 550
Coordinates33.76667, -90.236
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.7 US tons
Inventory rating16 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans9
Design loadHS 20
Structure length171 ft (52.1 m)
Longest span19 ft (5.8 m)
Deck width25 ft (7.5 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic140 (2015)
Projected traffic165 by 2035
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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$452,000
NavigationNo navigation control on waterway

Frequently asked questions

When was CO RD 550 over Mill Bayou built?

It was built in 1955, making it 70 years old in 2025.

What condition is CO RD 550 over Mill Bayou 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 March 2024.

How much traffic does CO RD 550 over Mill Bayou carry?

About 140 vehicles per day (2015 count), of which roughly 8% are trucks.

How long is CO RD 550 over Mill Bayou?

The structure is 171 ft (52.1 m) long with a longest span of 19 ft (5.8 m) and a deck 25 ft wide.

Who owns CO RD 550 over Mill Bayou?

It is owned by the County Highway Agency.