US Bridges

Mo 51 S over Castor Rvr

Good

Bollinger County, Missouri · S 29 T 29 N R 9 E · Structure no. 36614

Built
2020
5 years old
Condition
Good
inspected December 2023
Type
Tee Beam
Prestressed Concrete Continuous
Length
347 ft
4 main spans
Daily traffic
717
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 51 S over Castor Rvr is a prestressed concrete continuous tee beam carrying Mo 51 S over Castor Rvr in Bollinger County, Missouri. It was built in 2020, so it is 5 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 717 vehicles a day, roughly 26% of them trucks, projected to reach 1,076 by 2044. The structure is 347 ft (105.9 m) long and 27 ft wide. If it were closed, the detour would be 28 mi (45 km).

CarriesMo 51 S
CrossesCastor Rvr
LocationS 29 T 29 N R 9 E
RouteState Highway 51
Coordinates37.14658, -90.07558
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.4 US tons
Inventory rating44.6 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length347 ft (105.9 m)
Longest span90 ft (27.4 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic717 (2024)
Projected traffic1,076 by 2044
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed28 mi (45 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 Mo 51 S over Castor Rvr built?

It was built in 2020, making it 5 years old in 2025.

What condition is Mo 51 S over Castor Rvr 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 December 2023.

How much traffic does Mo 51 S over Castor Rvr carry?

About 717 vehicles per day (2024 count), of which roughly 26% are trucks.

How long is Mo 51 S over Castor Rvr?

The structure is 347 ft (105.9 m) long with a longest span of 90 ft (27.4 m) and a deck 27 ft wide.

Who owns Mo 51 S over Castor Rvr?

It is owned by the State Highway Agency.