US Bridges

Bluffton RD over Synthianna CR

Fair

Montgomery County, Missouri · S 32 T 46 N R 6 W · Structure no. 31284

Built
2005
20 years old
Condition
Fair
inspected January 2023
Type
Channel Beam
Concrete
Length
46 ft
1 main span
Daily traffic
50
2023 count
Owner
County
County Highway Agency

About this bridge

Bluffton RD over Synthianna CR is a concrete channel beam carrying Bluffton RD over Synthianna CR in Montgomery County, Missouri. It was built in 2005, so it is 20 years old, younger 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 50 vehicles a day, roughly 10% of them trucks, projected to reach 63 by 2043. The structure is 46 ft (14 m) long and 26 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesBluffton RD
CrossesSynthianna CR
LocationS 32 T 46 N R 6 W
RouteCounty Highway 291
CountyMontgomery County
StateMissouri
Coordinates38.71303, -91.62092
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.6 US tons
Inventory rating33.7 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length46 ft (14 m)
Longest span45 ft (13.7 m)
Deck width26 ft (7.8 m)
Roadway width25 ft (7.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic63 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 Bluffton RD over Synthianna CR built?

It was built in 2005, making it 20 years old in 2025.

What condition is Bluffton RD over Synthianna 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 January 2023.

How much traffic does Bluffton RD over Synthianna CR carry?

About 50 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Bluffton RD over Synthianna CR?

The structure is 46 ft (14 m) long with a longest span of 45 ft (13.7 m) and a deck 26 ft wide.

Who owns Bluffton RD over Synthianna CR?

It is owned by the County Highway Agency.