US Bridges

SW501 over Marshall CR

Fair

Henry County, Missouri · S 25 T 40 N R 27 W · Structure no. 24374

Built
1991
34 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Prestressed Concrete
Length
140 ft
3 main spans
Daily traffic
35
2023 count
Owner
County
County Highway Agency

About this bridge

SW501 over Marshall CR is a prestressed concrete tee beam carrying SW501 over Marshall CR in Henry County, Missouri. It was built in 1991, so it is 34 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 35 vehicles a day, roughly 10% of them trucks, projected to reach 49 by 2043. The structure is 140 ft (42.7 m) long and 23 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSW501
CrossesMarshall CR
LocationS 25 T 40 N R 27 W
RouteCounty Highway 484
CountyHenry County
StateMissouri
Coordinates38.23715, -93.85322
Functional classRural Minor 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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length140 ft (42.7 m)
Longest span50 ft (15.2 m)
Deck width23 ft (6.9 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2023)
Projected traffic49 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 SW501 over Marshall CR built?

It was built in 1991, making it 34 years old in 2025.

What condition is SW501 over Marshall 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 March 2023.

How much traffic does SW501 over Marshall CR carry?

About 35 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SW501 over Marshall CR?

The structure is 140 ft (42.7 m) long with a longest span of 50 ft (15.2 m) and a deck 23 ft wide.

Who owns SW501 over Marshall CR?

It is owned by the County Highway Agency.