US Bridges

Mo 30 W over Big River

Fair

Jefferson County, Missouri · S 26 T 42 N R 3 E · Structure no. 2666

Built
1974
51 years old, rebuilt 2005
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
606 ft
3 main spans
Daily traffic
6,711
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 30 W over Big River is a steel continuous stringer/multi-beam or girder carrying Mo 30 W over Big River in Jefferson County, Missouri. It was built in 1974 and reconstructed in 2005, so it is 51 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 5 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 6,711 vehicles a day, roughly 5% of them trucks, projected to reach 11,409 by 2044. The structure is 606 ft (184.7 m) long and 47 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesMo 30 W
CrossesBig River
LocationS 26 T 42 N R 3 E
RouteState Highway 30
CountyJefferson County
StateMissouri
Coordinates38.34851, -90.64949
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.7 US tons
Inventory rating23.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+4 approach)
Design loadHS 20
Structure length606 ft (184.7 m)
Longest span150 ft (45.7 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,711 (2024)
Projected traffic11,409 by 2044
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 Mo 30 W over Big River built?

It was built in 1974, making it 51 years old in 2025. It was reconstructed in 2005.

What condition is Mo 30 W over Big River 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 May 2024.

How much traffic does Mo 30 W over Big River carry?

About 6,711 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Mo 30 W over Big River?

The structure is 606 ft (184.7 m) long with a longest span of 150 ft (45.7 m) and a deck 47 ft wide.

Who owns Mo 30 W over Big River?

It is owned by the State Highway Agency.