US Bridges

Is 55 N over Drain Dtch # 1

Fair

Scott County, Missouri · S 26 T 30 N R 13 E · Structure no. 354

Built
1961
64 years old
Condition
Fair
inspected February 2025
Type
Slab
Concrete Continuous
Length
70 ft
3 main spans
Daily traffic
14,979
2024 count
Owner
State
State Highway Agency

About this bridge

Is 55 N over Drain Dtch # 1 is a concrete continuous slab carrying Is 55 N over Drain Dtch # 1 in Scott County, Missouri. It was built in 1961, so it is 64 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.

It carries about 14,979 vehicles a day, roughly 20% of them trucks, projected to reach 28,460 by 2044. The structure is 70 ft (21.3 m) long and 47 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesIs 55 N
CrossesDrain Dtch # 1
LocationS 26 T 30 N R 13 E
RouteInterstate 55
Coordinates37.23294, -89.56501
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.5 US tons
Inventory rating38.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length70 ft (21.3 m)
Longest span23 ft (6.9 m)
Deck width47 ft (14.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,979 (2024)
Projected traffic28,460 by 2044
Trucks20%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Is 55 N over Drain Dtch # 1 built?

It was built in 1961, making it 64 years old in 2025.

What condition is Is 55 N over Drain Dtch # 1 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 February 2025.

How much traffic does Is 55 N over Drain Dtch # 1 carry?

About 14,979 vehicles per day (2024 count), of which roughly 20% are trucks.

How long is Is 55 N over Drain Dtch # 1?

The structure is 70 ft (21.3 m) long with a longest span of 23 ft (6.9 m) and a deck 47 ft wide.

Who owns Is 55 N over Drain Dtch # 1?

It is owned by the State Highway Agency.