US Bridges

350th ST over Thompson Br

Good

Gentry County, Missouri · S 36 T 63 N R 31 W · Structure no. 35556

Built
2016
9 years old
Condition
Good
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
15
2024 count
Owner
County
County Highway Agency

About this bridge

350th ST over Thompson Br is a steel stringer/multi-beam or girder carrying 350th ST over Thompson Br in Gentry County, Missouri. It was built in 2016, so it is 9 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 15 vehicles a day, roughly 10% of them trucks, projected to reach 17 by 2044. The structure is 60 ft (18.3 m) long and 20 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
Carries350th ST
CrossesThompson Br
LocationS 36 T 63 N R 31 W
RouteCounty Highway 171
CountyGentry County
StateMissouri
Coordinates40.21289, -94.33389
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure9 ExcellentNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating93.3 US tons
Inventory rating55.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span58 ft (17.7 m)
Deck width20 ft (6.2 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2024)
Projected traffic17 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 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 350th ST over Thompson Br built?

It was built in 2016, making it 9 years old in 2025.

What condition is 350th ST over Thompson Br 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 February 2023.

How much traffic does 350th ST over Thompson Br carry?

About 15 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is 350th ST over Thompson Br?

The structure is 60 ft (18.3 m) long with a longest span of 58 ft (17.7 m) and a deck 20 ft wide.

Who owns 350th ST over Thompson Br?

It is owned by the County Highway Agency.