US Bridges

SR 18 over Unnamed Stream

Poor

Copiah County, Mississippi · 0.2 MI W Hinds Cl · Structure no. 310001801502420

Built
1935
90 years old
Condition
Poor
inspected June 2024
Type
Culvert
Steel
Length
24 ft
2 main spans
Daily traffic
2,000
2023 count
Owner
State
State Highway Agency

About this bridge

SR 18 over Unnamed Stream is a steel culvert carrying SR 18 over Unnamed Stream in Copiah County, Mississippi. It was built in 1935, so it is 90 years old, older than the Mississippi average of 38.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 2,000 vehicles a day, roughly 14% of them trucks, projected to reach 2,000 by 2043. The structure is 24 ft (7.3 m) long and 26 ft wide. If it were closed, the detour would be 69 mi (111 km).

Location

Open in Google Maps
CarriesSR 18
CrossesUnnamed Stream
Location0.2 MI W Hinds Cl
RouteState Highway 18
CountyCopiah County
StateMississippi
Coordinates32.04639, -90.62838
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no 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 adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating36.8 US tons
Inventory rating22 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadH 15
Structure length24 ft (7.3 m)
Longest span11 ft (3.4 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2023)
Projected traffic2,000 by 2043
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed69 mi (111 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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$500 million
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 18 over Unnamed Stream built?

It was built in 1935, making it 90 years old in 2025.

What condition is SR 18 over Unnamed Stream in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2024.

How much traffic does SR 18 over Unnamed Stream carry?

About 2,000 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is SR 18 over Unnamed Stream?

The structure is 24 ft (7.3 m) long with a longest span of 11 ft (3.4 m) and a deck 26 ft wide.

Who owns SR 18 over Unnamed Stream?

It is owned by the State Highway Agency.