US Bridges

Rt a S over Watson CR

Fair

Gasconade County, Missouri · S 8 T 41 N R 6 W · Structure no. 8645

Built
1931
94 years old
Condition
Fair
inspected September 2024
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
327
2024 count
Owner
State
State Highway Agency

About this bridge

Rt a S over Watson CR is a concrete continuous culvert carrying Rt a S over Watson CR in Gasconade County, Missouri. It was built in 1931, so it is 94 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 327 vehicles a day, roughly 4% of them trucks, projected to reach 425 by 2044. The structure is 26 ft (7.8 m) long and 32 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesRt a S
CrossesWatson CR
LocationS 8 T 41 N R 6 W
RouteState Highway 0A
CountyGasconade County
StateMissouri
Coordinates38.31085, -91.62409
Functional classRural Major Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46.6 US tons
Inventory rating27.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 10
Structure length26 ft (7.8 m)
Longest span10 ft (3 m)
Deck width32 ft (9.9 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic327 (2024)
Projected traffic425 by 2044
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 km)
TollOn a free road
National Highway SystemNo

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 Rt a S over Watson CR built?

It was built in 1931, making it 94 years old in 2025.

What condition is Rt a S over Watson 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 September 2024.

How much traffic does Rt a S over Watson CR carry?

About 327 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Rt a S over Watson CR?

The structure is 26 ft (7.8 m) long with a longest span of 10 ft (3 m) and a deck 32 ft wide.

Who owns Rt a S over Watson CR?

It is owned by the State Highway Agency.