US Bridges

Randolph RD over Thornton Mill CR

Fair

Clay County, Missouri · S 28 T 51 N R 32 W · Structure no. 29198

Built
2001
24 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
81 ft
1 main span
Daily traffic
2,400
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

Randolph RD over Thornton Mill CR is a steel stringer/multi-beam or girder carrying Randolph RD over Thornton Mill CR in Clay County, Missouri. It was built in 2001, so it is 24 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 2,400 vehicles a day, roughly 5% of them trucks, projected to reach 3,840 by 2044. The structure is 81 ft (24.7 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesRandolph RD
CrossesThornton Mill CR
LocationS 28 T 51 N R 32 W
RouteCity Street 151
CountyClay County
StateMissouri
Coordinates39.20002, -94.49336
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.4 US tons
Inventory rating41.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length81 ft (24.7 m)
Longest span80 ft (24.4 m)
Deck width36 ft (10.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,400 (2024)
Projected traffic3,840 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Randolph RD over Thornton Mill CR built?

It was built in 2001, making it 24 years old in 2025.

What condition is Randolph RD over Thornton Mill 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 December 2023.

How much traffic does Randolph RD over Thornton Mill CR carry?

About 2,400 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Randolph RD over Thornton Mill CR?

The structure is 81 ft (24.7 m) long with a longest span of 80 ft (24.4 m) and a deck 36 ft wide.

Who owns Randolph RD over Thornton Mill CR?

It is owned by the City or Municipal Highway Agency.