US Bridges

SR 18 over Terrapin Skin CR Relief

Good

Rankin County, Mississippi · 0.8 MI E I 20 · Structure no. 310001806107050

Built
2005
20 years old
Condition
Good
inspected October 2024
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
16,000
2023 count
Owner
State
State Highway Agency

About this bridge

SR 18 over Terrapin Skin CR Relief is a concrete culvert carrying SR 18 over Terrapin Skin CR Relief in Rankin County, Mississippi. It was built in 2005, so it is 20 years old, younger than the Mississippi average of 38.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 16,000 vehicles a day, roughly 8% of them trucks, projected to reach 16,000 by 2043. The structure is 25 ft (7.5 m) long. If it were closed, the detour would be 8.1 mi (13 km).

CarriesSR 18
CrossesTerrapin Skin CR Relief
Location0.8 MI E I 20
RouteState Highway 18
Coordinates32.26773, -90.03368
Functional classUrban Other Principal Arterial

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 protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionOctober 2024
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 rating58.3 US tons
Inventory rating34.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 15
Structure length25 ft (7.5 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,000 (2023)
Projected traffic16,000 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed8.1 mi (13 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 18 over Terrapin Skin CR Relief built?

It was built in 2005, making it 20 years old in 2025.

What condition is SR 18 over Terrapin Skin CR Relief 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 October 2024.

How much traffic does SR 18 over Terrapin Skin CR Relief carry?

About 16,000 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is SR 18 over Terrapin Skin CR Relief?

The structure is 25 ft (7.5 m) long with a longest span of 12 ft (3.7 m).

Who owns SR 18 over Terrapin Skin CR Relief?

It is owned by the State Highway Agency.