US Bridges

County RD 7490 over Corn CR

FairPosted for load

Phelps County, Missouri · S 9 T 36 N R 36 W · Structure no. 32689

Built
1930
95 years old
Condition
Fair
inspected November 2023
Type
Slab
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
50
2024 count
Owner
County
County Highway Agency

About this bridge

County RD 7490 over Corn CR is a concrete continuous slab carrying County RD 7490 over Corn CR in Phelps County, Missouri. It was built in 1930, so it is 95 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. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, roughly 5% of them trucks, projected to reach 65 by 2044. The structure is 22 ft (6.6 m) long and 12 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesCounty RD 7490
CrossesCorn CR
LocationS 9 T 36 N R 36 W
RouteCounty Highway 231
CountyPhelps County
StateMissouri
Coordinates37.80325, -91.87278
Functional classRural 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating21.8 US tons
Inventory rating12.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length22 ft (6.6 m)
Longest span10 ft (3.1 m)
Deck width12 ft (3.6 m)
Roadway width12 ft (3.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2024)
Projected traffic65 by 2044
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$239,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 7490 over Corn CR built?

It was built in 1930, making it 95 years old in 2025.

What condition is County RD 7490 over Corn 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 November 2023.

How much traffic does County RD 7490 over Corn CR carry?

About 50 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is County RD 7490 over Corn CR?

The structure is 22 ft (6.6 m) long with a longest span of 10 ft (3.1 m) and a deck 12 ft wide.

Who owns County RD 7490 over Corn CR?

It is owned by the County Highway Agency.