US Bridges

Mo 8 E over Big Rvr

Fair

St. Francois County, Missouri · S 6 T 36 N R 4 E · Structure no. 6130

Built
1960
65 years old, rebuilt 2009
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
417 ft
3 main spans
Daily traffic
6,462
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 8 E over Big Rvr is a steel continuous stringer/multi-beam or girder carrying Mo 8 E over Big Rvr in St. Francois County, Missouri. It was built in 1960 and reconstructed in 2009, so it is 65 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 6,462 vehicles a day, roughly 12% of them trucks, projected to reach 11,309 by 2044. The structure is 417 ft (127.1 m) long and 30 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

Location

Open in Google Maps
CarriesMo 8 E
CrossesBig Rvr
LocationS 6 T 36 N R 4 E
RouteState Highway 8
CountySt. Francois County
StateMissouri
Coordinates37.86782, -90.63937
Functional classRural Principal Arterial - Other

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.6 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadH 20
Structure length417 ft (127.1 m)
Longest span115 ft (35 m)
Deck width30 ft (9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,462 (2024)
Projected traffic11,309 by 2044
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.2 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mo 8 E over Big Rvr built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2009.

What condition is Mo 8 E over Big Rvr 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 December 2024.

How much traffic does Mo 8 E over Big Rvr carry?

About 6,462 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is Mo 8 E over Big Rvr?

The structure is 417 ft (127.1 m) long with a longest span of 115 ft (35 m) and a deck 30 ft wide.

Who owns Mo 8 E over Big Rvr?

It is owned by the State Highway Agency.