US Bridges

L-40-2020 over Mill Creek

FairPosted for load

Richland County, South Carolina · 8 MI SE of Columbia · Structure no. 000000000009871

Built
1920
105 years old
Condition
Fair
inspected June 2024
Type
Culvert
Concrete
Length
20 ft
1 main span
Daily traffic
2,200
2023 count
Owner
County
County Highway Agency

About this bridge

L-40-2020 over Mill Creek is a concrete culvert carrying L-40-2020 over Mill Creek in Richland County, South Carolina. It was built in 1920, so it is 105 years old, older than the South Carolina average of 48 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 2,200 vehicles a day, roughly 3% of them trucks, projected to reach 2,816 by 2043. The structure is 20 ft (6.1 m) long and 22 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesL-40-2020
CrossesMill Creek
Location8 MI SE of Columbia
RouteCounty Highway 2020
CountyRichland County
StateSouth Carolina
Coordinates33.94353, -80.91225
Functional classUrban 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
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating31.4 US tons
Inventory rating18.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 10
Structure length20 ft (6.1 m)
Longest span20 ft (6.1 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,200 (2023)
Projected traffic2,816 by 2043
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$107,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was L-40-2020 over Mill Creek built?

It was built in 1920, making it 105 years old in 2025.

What condition is L-40-2020 over Mill 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 June 2024.

How much traffic does L-40-2020 over Mill Creek carry?

About 2,200 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is L-40-2020 over Mill Creek?

The structure is 20 ft (6.1 m) long with a longest span of 20 ft (6.1 m) and a deck 22 ft wide.

Who owns L-40-2020 over Mill Creek?

It is owned by the County Highway Agency.