US Bridges

US 61 S over Isle Du Bois CR

Fair

Ste. Genevieve County, Missouri · S 18 T 39 N R 7 E · Structure no. 5923

Built
1939
86 years old, rebuilt 2008
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
162 ft
5 main spans
Daily traffic
1,797
2024 count
Owner
State
State Highway Agency

About this bridge

US 61 S over Isle Du Bois CR is a steel stringer/multi-beam or girder carrying US 61 S over Isle Du Bois CR in Ste. Genevieve County, Missouri. It was built in 1939 and reconstructed in 2008, so it is 86 years old, older than the Missouri average of 45.1 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.

It carries about 1,797 vehicles a day, roughly 15% of them trucks, projected to reach 2,516 by 2044. The structure is 162 ft (49.5 m) long and 29 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesUS 61 S
CrossesIsle Du Bois CR
LocationS 18 T 39 N R 7 E
RouteU.S. Route 61
Coordinates38.09046, -90.2923
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating81.4 US tons
Inventory rating48.6 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length162 ft (49.5 m)
Longest span30 ft (9.1 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,797 (2024)
Projected traffic2,516 by 2044
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 61 S over Isle Du Bois CR built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 2008.

What condition is US 61 S over Isle Du Bois CR 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 October 2024.

How much traffic does US 61 S over Isle Du Bois CR carry?

About 1,797 vehicles per day (2024 count), of which roughly 15% are trucks.

How long is US 61 S over Isle Du Bois CR?

The structure is 162 ft (49.5 m) long with a longest span of 30 ft (9.1 m) and a deck 29 ft wide.

Who owns US 61 S over Isle Du Bois CR?

It is owned by the State Highway Agency.