US Bridges

Old Cadet RD over Three Hill CR

Poor

St. Francois County, Missouri · S 31 T 38 N R 4 E · Structure no. 13033

Built
1940
85 years old
Condition
Poor
inspected December 2024
Type
Slab
Concrete
Length
20 ft
2 main spans
Daily traffic
100
2023 count
Owner
County
County Highway Agency

About this bridge

Old Cadet RD over Three Hill CR is a concrete slab carrying Old Cadet RD over Three Hill CR in St. Francois County, Missouri. It was built in 1940, so it is 85 years old, older than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 100 vehicles a day, roughly 10% of them trucks, projected to reach 150 by 2043. The structure is 20 ft (6.1 m) long and 21 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesOld Cadet RD
CrossesThree Hill CR
LocationS 31 T 38 N R 4 E
RouteCounty Highway 27
CountySt. Francois County
StateMissouri
Coordinates37.96307, -90.62836
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating54.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadOther
Structure length20 ft (6.1 m)
Longest span17 ft (5.2 m)
Deck width21 ft (6.5 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic150 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$216,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Cadet RD over Three Hill CR built?

It was built in 1940, making it 85 years old in 2025.

What condition is Old Cadet RD over Three Hill CR in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2024.

How much traffic does Old Cadet RD over Three Hill CR carry?

About 100 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Old Cadet RD over Three Hill CR?

The structure is 20 ft (6.1 m) long with a longest span of 17 ft (5.2 m) and a deck 21 ft wide.

Who owns Old Cadet RD over Three Hill CR?

It is owned by the County Highway Agency.