US Bridges

Old Rt Mm over Bear CR

Fair

Jefferson County, Missouri · S 3 T 42 N R 4 E · Structure no. 31783

Built
1955
70 years old
Condition
Fair
inspected February 2025
Type
Culvert
Concrete Continuous
Length
41 ft
3 main spans
Daily traffic
11,001
2023 count
Owner
County
County Highway Agency

About this bridge

Old Rt Mm over Bear CR is a concrete continuous culvert carrying Old Rt Mm over Bear CR in Jefferson County, Missouri. It was built in 1955, so it is 70 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 11,001 vehicles a day, roughly 10% of them trucks, projected to reach 18,702 by 2043. The structure is 41 ft (12.5 m) long and 36 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

Open in Google Maps
CarriesOld Rt Mm
CrossesBear CR
LocationS 3 T 42 N R 4 E
RouteCounty Highway 0
CountyJefferson County
StateMissouri
Coordinates38.41081, -90.56939
Functional classUrban Minor 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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2025
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating57.5 US tons
Inventory rating33.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadH 15
Structure length41 ft (12.5 m)
Longest span12 ft (3.7 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,001 (2023)
Projected traffic18,702 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Old Rt Mm over Bear CR built?

It was built in 1955, making it 70 years old in 2025.

What condition is Old Rt Mm over Bear 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 February 2025.

How much traffic does Old Rt Mm over Bear CR carry?

About 11,001 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Old Rt Mm over Bear CR?

The structure is 41 ft (12.5 m) long with a longest span of 12 ft (3.7 m) and a deck 36 ft wide.

Who owns Old Rt Mm over Bear CR?

It is owned by the County Highway Agency.