US Bridges

County RD 425 over Portage Byu

Fair

New Madrid County, Missouri · S 27 T 21 N R 13 E · Structure no. 19760

Built
1949
76 years old, rebuilt 1992
Condition
Fair
inspected December 2024
Type
Channel Beam
Concrete
Length
76 ft
3 main spans
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 425 over Portage Byu is a concrete channel beam carrying County RD 425 over Portage Byu in New Madrid County, Missouri. It was built in 1949 and reconstructed in 1992, so it is 76 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 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 30 vehicles a day, roughly 10% of them trucks, projected to reach 41 by 2043. The structure is 76 ft (23.2 m) long and 25 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCounty RD 425
CrossesPortage Byu
LocationS 27 T 21 N R 13 E
RouteCounty Highway 232
CountyNew Madrid County
StateMissouri
Coordinates36.43614, -89.62696
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.7 US tons
Inventory rating27.8 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length76 ft (23.2 m)
Longest span22 ft (6.7 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic41 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 County RD 425 over Portage Byu built?

It was built in 1949, making it 76 years old in 2025. It was reconstructed in 1992.

What condition is County RD 425 over Portage Byu 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 2024.

How much traffic does County RD 425 over Portage Byu carry?

About 30 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD 425 over Portage Byu?

The structure is 76 ft (23.2 m) long with a longest span of 22 ft (6.7 m) and a deck 25 ft wide.

Who owns County RD 425 over Portage Byu?

It is owned by the County Highway Agency.