US Bridges

Rt Tt S over Is 55

Fair

Jefferson County, Missouri · S 2078 T 39 N R 7 E · Structure no. 1671

Built
1970
55 years old, rebuilt 1984
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
238 ft
4 main spans
Daily traffic
1,368
2024 count
Owner
State
State Highway Agency

About this bridge

Rt Tt S over Is 55 is a steel continuous stringer/multi-beam or girder carrying Rt Tt S over Is 55 in Jefferson County, Missouri. It was built in 1970 and reconstructed in 1984, so it is 55 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 1,368 vehicles a day, roughly 33% of them trucks, projected to reach 2,462 by 2044. The structure is 238 ft (72.4 m) long and 31 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesRt Tt S
CrossesIs 55
LocationS 2078 T 39 N R 7 E
RouteState Highway 0TT
CountyJefferson County
StateMissouri
Coordinates38.09242, -90.3005
Functional classRural Minor Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37.7 US tons
Inventory rating22.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length238 ft (72.4 m)
Longest span86 ft (26.2 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,368 (2024)
Projected traffic2,462 by 2044
Trucks33%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed14.3 mi (23 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Rt Tt S over Is 55 built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 1984.

What condition is Rt Tt S over Is 55 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 2024.

How much traffic does Rt Tt S over Is 55 carry?

About 1,368 vehicles per day (2024 count), of which roughly 33% are trucks.

How long is Rt Tt S over Is 55?

The structure is 238 ft (72.4 m) long with a longest span of 86 ft (26.2 m) and a deck 31 ft wide.

Who owns Rt Tt S over Is 55?

It is owned by the State Highway Agency.