US Bridges

Or 55 S over Illmo Br

Good

Scott County, Missouri · S 5 T 29 N R 14 E · Structure no. 35609

Built
2017
8 years old
Condition
Good
inspected January 2025
Type
Culvert
Concrete Continuous
Length
42 ft
3 main spans
Daily traffic
1,374
2024 count
Owner
State
State Highway Agency

About this bridge

Or 55 S over Illmo Br is a concrete continuous culvert carrying Or 55 S over Illmo Br in Scott County, Missouri. It was built in 2017, so it is 8 years old, younger than the Missouri average of 45.1 years.

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

It carries about 1,374 vehicles a day, roughly 5% of them trucks, projected to reach 1,992 by 2044. The structure is 42 ft (12.9 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesOr 55 S
CrossesIllmo Br
LocationS 5 T 29 N R 14 E
RouteState Highway 55
Coordinates37.21116, -89.53329
Functional classRural Local

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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.4 US tons
Inventory rating46.6 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHL 93
Structure length42 ft (12.9 m)
Longest span13 ft (4 m)
Deck width30 ft (9.1 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,374 (2024)
Projected traffic1,992 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 55 S over Illmo Br built?

It was built in 2017, making it 8 years old in 2025.

What condition is Or 55 S over Illmo Br 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 January 2025.

How much traffic does Or 55 S over Illmo Br carry?

About 1,374 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Or 55 S over Illmo Br?

The structure is 42 ft (12.9 m) long with a longest span of 13 ft (4 m) and a deck 30 ft wide.

Who owns Or 55 S over Illmo Br?

It is owned by the State Highway Agency.